Desafio Projetos Aleatórios #07 - Projetos em Andamento

Added: 2026-05-26

[00:00:01]Now we're live! Hello, makers of cool things.

[00:00:05]We're here chatting, but Streamard didn't put us live. So, here we are assembling and disassembling things, doing random projects that you can apply in your home. Hey Luiz, who's just joining us? What's the Young Mechatronics Club all about?

[00:00:21]Well, the Young Mechatronics Club is a place where people meet to discuss technology.

[00:00:26]On Wednesday and Thursday nights, from 8 to 9 pm, here on the Instituto Sebra channel, we bring people together, whether they are engineers, researchers, artists, historians, in short, we have a multitude of people who come together and accept challenges, and every two months we have a new challenge that Renato can explain how it works.

[00:00:53]Exactly. We choose a theme, and then everyone on screen has to develop something related to that theme. This one is random, meaning the team had several ideas. So let's do this: take what you know best, pick a challenge you want to do, that you want to learn, and bring it here to the screen. So we have this project now, but we've already done innovative cities, we've done agricultural world events, we've done science fairs, that's 24 editions in total, okay? We're finishing music. We'll have a magazine soon where you can download all the projects, okay? OK. Good evening, Carlos. I'll also say goodnight to our friend Nicolas who's on the screen.

[00:01:32]Miguel can come onto the screen, Miguel. Our friend Márcio, he delivered the Cosmac article. Let's get to work. One month to go until the Nicbal magazine from Cosmak. It turned out great, okay? Trubian, our friend Trubian, and the E is here on the screen. Just a reminder that we have our analog meeting, right, Luiz? There at SENAI.

[00:01:53]Vila Mariana here in São Paulo.

[00:01:55]Here in São Paulo, we already had the first one, which was on March 20th in Paraná, in Paranavaí. And we're going to have our fifth meeting here in São Paulo on September 12th. Write it down in your planner, okay? OK. Ah, Reginaldo Registric is setting something up, he's working on a deal. We have here, folks, we have a link to everyone's channel, we have a link to the Discord channel. On the Discord channel, we do all the filtering, okay? There's nothing nonsensical about it; we only post topics related to our projects. So Reginaldo is building a doll with a tricycle over there, it's really cool. And here's our friend Gustavo Portá, also working on a really cool laudpad project. Subscribe to his channel and everyone else's channel below, okay? So I'm seeing that Streamyard has a slight delay, you know, Luiz? So what are we going to do? I'm going to say goodnight and then call you on the screen because I know there will be a slight delay. Good evening, Marcelo. Hugs to all the makers. Every live stream is a learning experience. For us too, okay? Every time I come to this screen, I'm learning something new here. Good evening, Enaldo. Our mobile library. I needed a magazine. I asked Márcio, I asked Nilton, I even asked Iá, where can I find a blessed project that a reader requested? No, there was no one left to appeal to. Cicero, for God's sake. It's not that Cicero thought so, boy.

[00:03:16][laughs] The guy is a walking library. Oh, continuing on, straight from Sorocaba. Good evening, dear Leo Corradini. Are you doing well?

[00:03:25]All good. Good evening, everyone. Good evening, Luís. Good evening, Renato. How are you all doing?

[00:03:29]Everything's great. Good evening to Silvio here.

[00:03:32][laughs] Leo, we have news about your microphone, coffee phone, sale phone, and so on.

[00:03:39]Any news today? So I assembled, you know, the new preamplifier, right, with an operational amplifier. I can show it, you know, maybe make some noise too, but basically it's about showing the circuit assembled on the breadboard, and talking a little about how the circuit works.

[00:04:00]Excellent.

[00:04:00]Legal.

[00:04:01]We have news. Just wait and see on the screen.

[00:04:03]So, continuing straight from rocket land, our friend Evair. Good evening, Evair. How are you?

[00:04:12]Hi everyone, greetings. Post-event Mouser Road Show São José dos Campos. Those who didn't go missed out. Those who were there only grew greater.

[00:04:22]Oh, I was inside Lab 56. I saw the workbench in person, you know? A big hug also to Sibá from São José dos Campos, to Wesley, the staff at the Nacional Wi Hotel, and to Alex, all very nice people in São José dos Campos. I highly recommend that you take a tour, spend a weekend there and explore São José dos Campos. It's really cool there, isn't it, Ivairir?

[00:04:47]That.

[00:04:49]Both in leisure and in professional life.

[00:04:51]And what are the hangars like at Lab 56? It's gigantic to fit all the equipment and tools.

[00:05:02]Yeah, it's not that huge when you look at it on the screen, but it's still big. And so it is, it's the coach's Disneyland over there. It has everything, it has everything, he has several instruments there, it's worth it. And he has a grinder. I had the pleasure of looking at the furniture he's assembling, man. It's millimeter-precise.

[00:05:22]The distance is very precise, like when you're using a hair straightener, you know? Very good, very well done indeed.

[00:05:27]We'll see here, right, Evair?

[00:05:29]He's taking the distance learning course. We will have a video presentation here today.

[00:05:33]I'll show you little by little, okay?

[00:05:34]You know it's getting harder and harder to do things, because now that the cold season is approaching, it's getting more and more difficult to do things outside.

[00:05:40]Yeah, I should have set up the heater before the table, right? Uh-huh. [laughs] No, but okay, we'll have news.

[00:05:47]Let me call everyone up on the screen.

[00:05:50]Following the order of arrival, I'll call our dear Professor Burgos.

[00:05:54]Good evening, dear Burgos. All good?

[00:05:57]Good evening, everyone. How are you all doing? Another night here with all these beasts. I was also at the Mouse Road Show in São José dos Campos with our friends there.

[00:06:07]Evair gave me a really cool tour of the city, didn't he? In this city, for those who are used to walking, walking, walking in São Paulo, there isn't that much to walk around in, you don't need to walk much, right? But it's really cool, really great. The event was wonderful, wasn't it? And there are those who say, there are those who know, that gigantic Mouser warehouse over there in Texas?

[00:06:32]Yes.

[00:06:32]There are rumors that Mouser is considering building a Warehouse 2 in São José dos Campos.

[00:06:40]Look at that one from Texas.

[00:06:44]Have you thought about it? Hey, I'm applying for a job there. [laughs] But what? I'm going to leave all my salary, everything in its place, there.

[00:06:53]Oh, something interesting, I'll tell you about it here. Ah, when we were at the MIC, the Interactive Science Museum, it was cool to learn that parents get together to hire a makeup teacher to give classes to students in one of the families' garages. So, I was walking around the mall with Evair, and I came across a kiosk from a company that teaches robotics, right in the middle of the mall, with six computers and several kits. I said, "Wow, São José is a step ahead of the other cities in the state of São Paulo, right?

[00:07:28]So I thought it was cool, I thought it was cool to talk about that, I'll even show a video of Vander here of the guys going to a factory, but like, I thought it was cool, right? So, congratulations São José dos Campos, right?

[00:07:39]We also have news from Burgos.

[00:07:41]Hold on, more signs and more signs, and we'll have a presentation. And now I'm going to call you directly from Natal, the young part of mechatronics. Good evening, Nicolas.

[00:07:51]How are you? Hey. Hey everyone, how are you all doing? Good. And you, kid? Good, Nicolas?

[00:07:57]Good too?

[00:07:58]We're going to learn a lot today, Nicolas.

[00:08:01]Uh-huh. And you here, we're going to learn a lot here today. Nicolas is assembling a robotic arm. I'm going to assemble Pafúncio here. I'll continue making the conveyor belts. Burgos has that thing about the series lamp. Leo is also going to bring something interesting about this subject that also fits with Evair's workbench. And then Evair is going to do a project with Burgos. Hang in there, guys. We're going to learn a lot more.

[00:08:26]The last person of the night, if anyone arrives, they can join because we have openings on the panel today. I'll call you directly from Olímpia now, right? This man looks like a gypsy, our friend Mauro. Good evening, Mauro. How are you?

[00:08:39]Hello, everyone. Good evening. It's excellent.

[00:08:42]It's great to be back here resuming our presentations. Very cool, awesome. We'll have the CMI presentation, another cool, interesting step.

[00:08:54]Our friend Julian Cebraga, the link is in the descriptions of Julian's channel.

[00:08:59]He's improving his zoolopio, okay? So he's upgrading it. It was already good, but it's going to get even better. Soon he'll make version two, the mission.

[00:09:11]Version two, the mission. The frog tropes are already all groggy. It's going to stay like this, right? But let's go, guys. Besides being in São José, hey Renato, let me do One observation for those who don't go to the events. We always say, go to the events, you get to know the group, right?

[00:09:28]We met Julian at the Young Mechatronics Club in Paranavaí, right, for the first meeting.

[00:09:35]Ah, Junior, Junior seemed to me that his size is equivalent to his genius, man. Yeah, he's quite tall.

[00:09:44]No, but look, no, his size is in accordance with his genius, man, to do things in the area of electronics, of [laughs] mechatronics.

[00:09:52]Oh, I'd like to see the following one day, at our young mechatronics meeting, okay? Julian, Léo Corradini and Otávio. It'll be a giant wall, right? A basketball team, right?

[00:10:05]Yeah, a basketball team. The twin towers, right?

[00:10:07]I don't know Nicolas. Nicolas, how tall are you? Just curious, because we don't know you personally.

[00:10:12]Worse than that, I don't know off the top of my head. I can't believe it. No, no. No. Not head circumference.

[00:10:16]Height. I'm kidding, Nicolas.

[00:10:20]Head circumference. I don't know. [laughs] Did anyone see it from afar?

[00:10:24]Which one? But you don't know? Mom and Dad.

[00:10:27]Mom's name is Vitória. Not Verônica.

[00:10:31]Verônica. Sorry. Verônica. She doesn't know. Ask her. Mom knows everything, my friend. Because she had a little mark on the door frame. Look on the door frame. There should be a little mark there with the height. We used to do that when we were kids. [laughs] Yeah, maybe there isn't.

[00:10:45]Yeah, Nicolas is already big.

[00:10:48]He must be a monster, usually teenagers today are big, tall, right?

[00:10:54]Yeah.

[00:10:54]In our generation they were smaller.

[00:10:57]Uh-huh.

[00:10:58]Oh, thanks, Burgos, a hug.

[00:11:00]No, but it's true. It's true. I know I mentioned Júlia. It 'll be professional. Perfect. Oh, from Disney, right? Disney has a great zotrope at the Disney park.

[00:11:11]Uh, you're Okay, Nicolas, if anything, just disable the microphone, okay?

[00:11:14]Okay. And to add to that, uh, São José dos Campos, I was at Eletroáquila.

[00:11:20]Really cool, really great, right? Go there, go there. He, look, he's going to measure height. He's going to measure height, look. Ah, [laughs] do it live, do it live.

[00:11:29]The R 9000, do the R 9000. It's already solved the problem.

[00:11:34]That's right. I should have gone to Eletroap. No, but it was the first visit, right? I'll go there other times. Ah, other times. And Renatinho, São José dos Campos. Hi.

[00:11:41]Tell the truth, we're wrong, right?

[00:11:43]Because we didn't take a picture at Eletro.

[00:11:46]Yeah, it's a real photo, no. There will be another one there. Go there again.

[00:11:51]And we didn't take a picture at the colonel's, but then again, right? Otherwise we would leave our friend.

[00:11:56]Yeah, I would be upset, man.

[00:11:57]Okay.

[00:11:59]Alright, now [laughs] Nicolas, how tall are you? I'm 1.65m.

[00:12:05]Oh, no. It's okay. Not as tall as Leo Corradini who's 2.50m. Not all that.

[00:12:10]Yeah, but he's 15, right?

[00:12:12]He has to... That's true. The problem is that 15-year-olds nowadays... I 'm almost 2m tall, you know?

[00:12:19][clearing throat] Yeah. Let's go, everyone. Let's say time is short. Uh, I'll start here, I'll show Evair's video, okay?

[00:12:30]Let's start with Evair and then you explain at the workbench.

[00:12:35]I'll show a very short video of 1 minute 20 seconds and then you explain, okay?

[00:12:39]And go, okay? There's no sound, okay, guys? There's no sound, okay? OK. Silent film. Let's go. Yeah, and quickly.

[00:14:23]Excellent. You know how to play, right?

[00:14:26]So I'll give you a tip here.

[00:14:27]Maker teachers, this workbench is a guarantee seal that... You can give this to your students' parents; it's safe. It takes a bit of work to make, but once you make this workbench, it will last for generations, literally, right?

[00:14:46]Uh-huh.

[00:14:47]And just out of curiosity, taking into account the labor costs, do you have a rough idea of ​​how much a workbench like this costs?

[00:14:55]I'll... I'll look up, actually, I did look one up, but I don't remember exactly. I'll look up the cost of the parts and components. I'll look it up, okay? It's a worthwhile investment, you know, especially for teachers who assemble them, right?

[00:15:10]Because it's made in a somewhat artisanal way, it might be a little heavy, but it's nothing too exorbitant, right?

[00:15:18]Perfect. Is there anything else?

[00:15:20]You can retrofit the workbenches, just doing the panel part, right? You can retrofit; you don't need to build a workbench from scratch.

[00:15:29]You can use an existing workbench and retrofit it, because electrical safety is important, right? Okay, so you can take advantage of the ideas there, and actually, you'll assemble this workbench in the way that best suits you, right? If you have this workbench that I made, it's meant to be placed on a table. So, if you have a larger table, you can make a larger workbench. If you have a smaller table, you can make a smaller workbench, right?

[00:15:52]Incidentally, just out of curiosity, this workbench has a series lamp very similar to what Burgos is doing, which is two lamps, but the operation is a little different, I think, from what Burgos will show us later.

[00:16:07]This workbench can be assembled in a school laboratory, right?

[00:16:11]Yes, it can. I think it works well. And this workbench, which I made here in São José dos Campos, is 220V, and normally you don't have 110V or 127V in the outlets, right? So it also has a 127V isolation transformer, right? But normally you wouldn't need it, right?

[00:16:31]You can, if you only have it in your region.

[00:16:33]For example, only 127 wouldn't be necessary. I'll even give you a spoiler here, we're not going to guarantee it yet, right, Renato, but there's a good chance that whoever goes to the meeting, oh, folks, go to the meeting, huh? Yes, there will be a version of this workbench at the meeting, right, Renato?

[00:16:47]Oh, you're the one saying that. Let's go.

[00:16:50]You understand? Who knows, maybe we'll see a version, a smaller version, but a fully functional version at the meeting.

[00:16:57]Oh, our friend Carlos who's on WhatsApp said he's going to make one. So, Carlos, here's the thing, in the end we'll have an article just about this workbench, so we'll have the electrical diagram, we'll have all the measurements and everything else. So stay tuned, we'll have the publication soon. Hi.

[00:17:15]Also, what I'm going to tell you is this. I'm showing these video series, sometimes they're not quite in chronological order, right? I've already shown a bit of the control panel, right? Because these videos I'm showing are of the version one workbench that I already have. Done, assembled, okay? And then I'm going to make a video showing the assembly of the MJ version workbench, which will be the new workbench.

[00:17:46]Good, good. I liked the idea, man.

[00:17:49]Ah, that's why I understand now, because I saw a little bit of sawdust near a hole, so I understand now, because it wasn't up to standard, Evair, right? That little saw there. Yeah. You understand? Okay? Then I'll show more details of the MJ workbench, which will be very similar to this one, but I'll update it a bit, right?

[00:18:11]You understand?

[00:18:12]But while there's no time, while there's no time, I'll give spoilers with these little videos and things I have from the previous workbench, right?

[00:18:19]Enaldo said it's still portable.

[00:18:21]I understand. But then it's still portable.

[00:18:23]So you'll be assembling the portable version. Cool. And Miguel is asking here, isolating transformer or 220 to 200 to 110 autotransformer?

[00:18:33]No, isolating. There are two isolating transformers there. One 220 to 220 and one 110, and one 200 and one 220 to 110. But all isolating with two separate windings.

[00:18:45]Excellent. Excellent. So as not to cause problems for the students, right? Uh-huh.

[00:18:50]Perfect. Great. Moving on, we're going to bring in Léo Corradini.

[00:18:56]How's your ribbon microphone doing at Café e Sal?

[00:19:02]Or is there anything else you'd like to show us? Well, I'll show you the current setup, right? Then I'll show you the diagram on paper, okay?

[00:19:19]Maybe we'll turn it on tomorrow, it's a bit rushed today, right?

[00:19:23]No problem. We have some live streams.

[00:19:26]Nice. Great.

[00:19:29]The guy can do breadboard assemblies. It looks nice, doesn't it? [laughs] Yeah. Yeah. Typical Léo setup, right? Typical Léo setup. Exactly. A little bit.

[00:19:39]Further back, Leo. But it's OK. You can speak. Now, yes.

[00:19:44]So, the operational amplifier is down here, right?

[00:19:49]Below this capacitor here.

[00:19:53]OK.

[00:19:55]Power supply, the little transformer for the microphone's matching, right, with the preamp input.

[00:20:04]Right.

[00:20:09][clearing throat] I think that's good, right? It's good.

[00:20:13]It's, it's good, it's good. You can see it.

[00:20:15]Uh-huh. And in the last live stream, 15 days ago, you said you were going to make a change. And what would that change be?

[00:20:22]So, exactly, it's this, right?

[00:20:26]Uh, replacing [clearing throat] the transistor with an operational amplifier.

[00:20:31]So, the idea here, uh, what's the advantage of using an operational amplifier? It's much easier to have variable gains, right? By modifying two resistors, right?

[00:20:43]These two resistors here, the ratio between them gives the gain, right? In this case, 1K by 470K, we have a gain of 470, right? And the The other issue is also the symmetrical power supply, right?

[00:21:00]Operational microcontrollers need a symmetrical power supply, but with a little trick here: by supplying the non-inverting input with half the supply voltage, we put the output at half the supply voltage, right? Because the DC gain here is one.

[00:21:21]Notice that this resistor here is isolated from ground by a capacitor. So the gain here is actually a closed loop. The output is directly connected to the inverting input. Therefore, we have a gain equal to one in DC, right? But as alternating current enters here, we have a gain in OC.

[00:21:46]The capacitor allows for an OC gain.

[00:21:49]As the frequency increases here, we have a current draining to ground and we have an AC gain.

[00:22:00]So, another issue is that, since the Micro A741 may not work well with a symmetrical 4.5V, I might eventually increase this voltage a little. I'll go from 9 to 12V, maybe even to... 15V to increase its supply voltage a little more. That's something I'll have to look into later. These small capacitors here are precisely to try and reduce noise, right?

[00:22:35]Ah, while this capacitor here increases the AC gain, these small capacitors here decrease the AC gain, but at very high frequencies. If I have a lot of noise, it can eliminate the interference.

[00:22:51]Perfect. There 's another one on the coil too.

[00:22:55]I also tested this here, I removed it, but the transformer can also be added. This is the microphone itself, right?

[00:23:06]Uh-huh. And the resistor that tells the smartphone that it has an external microphone. That's why there's this resistor here at the smartphone's input.

[00:23:23]And that's it.

[00:23:23]Interesting.

[00:23:27]Not this one. We'd have to see it working, right?

[00:23:29]We'd have to see the final product.

[00:23:35]But cool, Leo. Cool. Besides that, other things can also be used and experimented with.

[00:23:40]Operational amplifiers here, right? This one is a classic, isn't it? This one is the 458, which is dual, right? It's more appropriate for audio, but the 741 also works very well in audio, mainly because its bandwidth is 1 MHz, so it has plenty of bandwidth, right?

[00:24:01]So the only problem with this operational amplifier is the power supply. It works with a slightly higher voltage than what I'm putting here. This could cause some problems.

[00:24:12]So, basically, that's the modification.

[00:24:16]Excellent, Leo. Look, for someone who started with a simple circuit, right? It's good, each time increasing the number of components.

[00:24:22]Yes, the original was this, right? It started with this. The original was this. Look where we are now, right?

[00:24:27]That's it.

[00:24:27]Great, Leo. Great. Look, so you can follow along, if you watch the live streams, all the live streams, you'll see Leo developing the prototype here. And you see that, well, it's not off the top of your head, it's just putting in... Test, place, and test again. And that's how it goes. Look, Enaldo put it here, Leo, he saw on YouTube a guy who had a ribbon microphone, his wife went to blow dust off it and loosened the ribbon, that is, it came loose, right? A loss of 2.5k.

[00:24:54]That's expensive, huh?

[00:24:56]How much does your ribbon microphone cost, Leo?

[00:24:59]Yeah, right? But these are professional ones, right? Material from our epic. [laughs] Awesome. Hi, Evair. You have no audio, Evair?

[00:25:12]Later you show the electronic lamp schematic, Renato.

[00:25:16]Yeah, yeah. When we start Burgos's, then I'll show the layout.

[00:25:22]Burgos, I made an electronic lamp to replace your analog filament lamp.

[00:25:29]Yeah, look, here you can use two batteries like this. It gets 9 or less according to our friend Márcio.

[00:25:37]Okay. Good evening, João. It's to simplify, actually it's to use one battery, right?

[00:25:42]To simplify.

[00:25:44]No problem, no problem. Using two batteries already... The circuit is getting more complex.

[00:25:48]Ah, the power supply is perfect.

[00:25:50]No problem.

[00:25:51]No, but here's the thing, with two batteries you'll need a larger battery holder, right? To fit both, a larger holder, right? I was thinking, maybe I'll use a 12V remote control battery.

[00:26:04]They're small, lighter, right? And a higher voltage. Since the current is small, it's fine. The current is ridiculous. The current is very small, only a few milliamps.

[00:26:16]That's it. No problem. A remote control battery will work for a few hours easily.

[00:26:22]It's perfectly fine for an experiment.

[00:26:25]Perfect. Perfect. Great. Look, Márcio is giving the OK here. Congratulations on the circuit's evolution. It's great to follow the evolution. Eh, now we're going to do it, Luiz, what are you going to show us today?

[00:26:39]I'll show you the K10, okay? Do you want me to show you something on the screen?

[00:26:45]Wait a minute.

[00:26:46]Ah, wait a minute. Explain what that is, Luiz. For those who don't know... Okay, so the K10 is a... it's a... it's an embedded module that has several sensors, a display screen, okay? It has a camera, right, left.

[00:27:10]Well, I'll show you in sequence, but it has several sensors, right? Several buttons and several connectivity interfaces.

[00:27:23]Perfect. For those who don't know, the K10 is a board developed by DF Robot to teach AI, artificial intelligence, and you can plug in a lot of things. I put the presentation on the screen, Luiz.

[00:27:37]Yes, put the PowerPoint.

[00:27:40]PowerPoint PPT. This is digital, right?

[00:27:46]So that's the K10, right? Presentation on the screen.

[00:27:49]Now I understand. Huh.

[00:27:52]Huh. What sensors does it have? Oh, I'll see everything it has, let me. I'm trying to move it around here. Now it's going to work. Talk to you.

[00:28:05]It's also useful for IoT, right?

[00:28:07]Artificial intelligence and IoT, because it has a color screen, a 2-megapixel camera, an ESP32 trace SC3, a microphone, a stereo microphone, okay?

[00:28:21]He has one, it's quite interesting, this microphone capture of his. He has an accelerometer, a light sensor, a temperature and humidity sensor, three RGB LEDs, two buttons, I/O ports, and expansion, right?

[00:28:37]He has an expansion and also a connector for a micro SD card so you can add additional memory.

[00:28:47]Great.

[00:28:48]So, everything inside this... It's actually a K10, the K10 is a mix of several things you 've already studied. All in the same place.

[00:29:01]Yes.

[00:29:02]So, let's show a little bit of the internal part, the question people have.

[00:29:06]Uh, what's the internal part of the K10 like? Uh, I have the internal part of the block, right?

[00:29:17]Uh, show what it has here, look. It has a boot button, two pins for the battery. So, there's a booster to power the ESP.

[00:29:30]Its connection is USB-C, type C.

[00:29:36]Okay? It has a character generator, a character generator component that we'll see, okay? And it has a pair here, the pin part... It's compatible with Microbit, okay? From BBC, BBC Microbit, it's compatible.

[00:29:55]Anyway, it has three RGB LEDs and let's see the circuit internally.

[00:30:04]It's a little blurry, right?

[00:30:06]Yeah, it's a little blurry. Uh, there's a video, Luiz, on the institute's channel that has an unboxing, it shows it, right?

[00:30:17]Oh, cool.

[00:30:18]You can post the link later.

[00:30:21]Oh, yeah, I'll post the link. But the interesting thing for us, okay? Let's say for those of us who do robotics, are these I/O pins that go outwards, which is I2C.

[00:30:29]So, in other words, you can use the Microbit and boost the Microbit with I2C output to do external movement, right?

[00:30:38]It has the bus here, the Microbit bus, right?

[00:30:43]Hmm.

[00:30:43]Okay. It has two, as I said, two microphones, a light sensor here, okay? It has a temperature and humidity sensor, okay? It has His ESP has Wi-Fi and Bluetooth, right? It has a 2-megapixel camera, very, very compact, right? With a lot of functionality.

[00:31:05]This little box of his here is cool. Look, it's very compact, right? But it's not a speaker, it's a loudspeaker, but it's like a little speaker box.

[00:31:17]Right.

[00:31:20]Can you see it?

[00:31:21]Oh, no. Do you want me to put it there? Shout it out, Luiz, I'm looking at the screen. Wait, wait, [clearing throat] wait.

[00:31:26]Okay. Show it, Luiz.

[00:31:28]There, now yes.

[00:31:32]It's on my finger here. This here is the mini speaker box.

[00:31:38]Tiny.

[00:31:40]Yeah, look. Thin, look. Super, super small.

[00:31:44]I'd say it looks like a cell phone, right?

[00:31:46]It's very compact. It looks like a pair of cell phones without the case.

[00:31:50]Good evening, Chip. Let's see the circuit internally. We have access to the circuit.

[00:31:57]This here is already, right, with its connectivity.

[00:32:03]It has, Oh, see? It already has the connectors. Uh, it has a zero port and a one port on the connector.

[00:32:09]It has an A and 2C connector for expansion.

[00:32:16]It has the ED connector part, can you see it here? It has all the features that are fully compatible with Microbit.

[00:32:24]And here's something interesting: it has an Aio expander, right, for internal use.

[00:32:28]He uses an I/O expander that is also I2C, right? I say I2C, but it's I2C.

[00:32:36]2C. So you expand through I2C, you expand or expand here.

[00:32:46]You have three RGB LEDs. Here it's showing four, but the license plate has three. There are only three.

[00:32:56]Here it is.

[00:32:59]Oh, wait a minute, Luiz. Shout it out! Strip. Remove the screen. Or you can remove the screen, Luiz.

[00:33:02]Let's go. Show it to me.

[00:33:04]Oh, these three LEDs here are RGB. That.

[00:33:08]Those addressable LEDs, right? That's what we call neopixel, right? AND.

[00:33:15]Beauty.

[00:33:17]Circuit there.

[00:33:19]Let's go back to the circuit, okay? Right there on the screen, on all the buttons, right? Button A, button B, boot. So, uh, you have the display controller.

[00:33:34]This is what the controller will do.

[00:33:36]But it has a character generator.

[00:33:41]What I mentioned earlier, the dual setup, has two microphones here and an ADC here specifically designed for action.

[00:33:51]And he has an amplifier, okay? Which goes into that tiny little speaker box over there.

[00:34:02]Perfect. State- of-the-art component. It's really, really cool. Here we have a whole section on power supply voltage, for example, 2.8 and 1.8 to power the camera, right?

[00:34:19]Digital camera. That's the S card connector.

[00:34:26]This is the one I mentioned, the character generator. It has 140 to 160.

[00:34:32]Uh, well, it has like Chinese characters, characters, well, it has an infinite number of characters, so you can run a... I found this issue of character generation here quite interesting for working with graphic displays.

[00:34:49]Perfect.

[00:34:51]And what about the sensor part, right?

[00:34:53]Temperature and humidity sensor, light sensor, and an accelerometer.

[00:34:58]Nice. We saw it electrically. So, well, it has the C connector, right?

[00:35:03]It has the last slide, it has a type C connector.

[00:35:08]Oh, okay. That's perfect. What a tribute.

[00:35:11]C show, show.

[00:35:16]And now we're going to show you the programming environment.

[00:35:19]No, first Luiz, first Luiz, Route 6464 has a question and I want to kill two birds with one stone, okay? For audio and video communication, we don't recommend LoRa, okay? LoRa is good for sending sensor data, but you can also connect LoRa to the K10 and, using Wi-Fi or Bluetooth (Bluetooth is the most recommended), you can transfer audio and video. The small display has AI for facial recognition. So you can imagine that you can do all sorts of audio and video, right?

[00:35:51]But how do you do that? O o laora para áudio e vídeo não é recomenda por causa da banda né? So you won't have enough bandwidth to transmit audio and video, right?

[00:36:00]Ah, so it would be more for sensors.

[00:36:04]So, you could use LoRa to transmit the sensor data.

[00:36:09]Good one, Luiz.

[00:36:10]We'll send the audio and video via Bluetooth, which we'll see shortly. But what is that huge, colorful panel all about? Mind plus.

[00:36:18]Ah, this is the environment, this is where we're going to use blocks, right?

[00:36:26]Just a minute.

[00:36:28]We'll wait, Luiz. We have it, you can do it in 20 minutes. Let's learn live here, shall we?

[00:36:39]There is? What are you going to do? Just curious.

[00:36:42]Let's write something on the screen. What do you think? Okay then. Let's go. I bet the girl will be alive.

[00:36:51]Oh, here it is, this is the screen orientation, right? The portrait, we can move the screen, leave it at zero, right? 0 degrees. Yes, great.

[00:37:05]And it can be used both in block-based programming and digitally, right?

[00:37:09]Typed, or rather, typed, right?

[00:37:11]It's like this, it automatically converts the blocks into C language.

[00:37:22]Cool.

[00:37:26]We start up, clear the screen.

[00:37:32]Let's activate the background.

[00:37:37]Let's activate the background.

[00:37:38]Colored background. OK.

[00:37:40]Let's go, let's add some color, a little green, okay? Let's write something. Let's go. How do you write on the screen?

[00:37:55]Write on line one, oh. Okay.

[00:38:02]The screen is very large here, so, look, we're writing it down there. I'm looking at it and it's blue. Now you've thrown it all away.

[00:38:14]Then you're going to type "viva moca" there in unhak. There is.

[00:38:22]And it will appear in blue, I believe. I think it's a good idea to change the green background to a white one, Luiz, because otherwise, you know?

[00:38:31]Put the white background there for now. This needs to be clear when displayed on the screen, otherwise it will cause problems. It's kind of grayish, right? But that's it.

[00:38:41]Kind of bluish. Hmm, let's see what's quiet. Here it is, I put it in cash, right? It's like, then it has an instruction that lets me find where to display cash. Could that be it?

[00:39:05]Where is it? I'm lost here.

[00:39:09]Let's look at the screen. To clean. Show content in cash. Room. Then only one goes down. Just one. Ah, here it is.

[00:39:17]That. Show cash. Does it really work like that? It will work. Let's go. Let's see. Let's go. Send code. And that. Like the Arduino IDE.

[00:39:31]You will compile it. Let's see if it compiles everything correctly.

[00:39:37]There's a black screen on the side that's showing Shell. Beauty. It takes a long time.

[00:39:45]TP. Oh no, it's already gone. Hey there, turn the screen around.

[00:39:50]I'm turning the screen now, it's you. Are you going to show your device?

[00:39:59]Yes, I will. It's just that I didn't have the Minecraft screen, nothing 's showing up. You ca n't see anything. Everything is white.

[00:40:06]So let's switch. I'll leave it now. Leave it, leave it at 45 degrees. There's something there. You can see that it is. Oh, now disappear. No chance. It turns black. Change the black background and then remove it; remove the background color and leave it black. Is it possible [clearing throat] to also change the font size to make it bigger or smaller?

[00:40:22]Yes, but it looks like it's 16, 24, right, Luiz? But seriously, good question, Nicolas. Just look. Ah, those are blocks, but if you type the code into the Arduino IDE, you can set it to any size, you see?

[00:40:38]Arduino IDE. Uh-huh. AND. And I'm going to talk about the Arduino IDE, right? In the ID section of M, where the text you program in C is located, you can change whatever you want. The block is just meant to be kind of generic, right?

[00:40:55]Alive.

[00:40:55]Put the color white there, okay, Luiz?

[00:41:02]At the source.

[00:41:04]Yes, put line C. Line one. Yes, on line five. It will stay in the middle. Yes, it will stay in the middle. AND. Let's go. Line five. And add some white there.

[00:41:12]There, in black and white, it couldn't be better.

[00:41:15]Display cash. Now show cash.

[00:41:18]Show content in cash.

[00:41:20]Now all that's left is to upload the code. Let's see.

[00:41:22]If you look, Nicolas, next to the code button, there's an Ino C office thing. You can still program in Python. That's cool, isn't it?

[00:41:32]Yeah.

[00:41:34]Well, the truth is that Mind Plus has nothing to do with K10. With this Minding Plus you can program ESP, Arduino, you can program whatever you want, it just has the block there, you understand? So we use it, but you can program, for example, the K10 with a micro screen, oops, sorry boss, [laughs] your screen will go up.

[00:41:56]Cable higher up. Hey, girl, now. He was. You could even put a moca in a gear.

[00:42:08]I asked the staff for help. I wanted to put "colocar" instead of "branco," " colocar engrendar." AND. There you go.

[00:42:16]No, wait, wait, Luiz. Calm down, calm down. Hey guys, while you're racking your brains trying to make the Grenar match work, we'll be back in the end. Luiz, try to find a way to convert it to Grenar while I'm going to ask... You have to find the RGB colors for the LED. It has an LED. I'm going back to the main screen.

[00:42:35]Oh, good question. The guy is asking where I can find Mind Plus. Hey Luiz, go back there.

[00:42:44]Hey, isn't there already a ready-made garnet shade in white? If you click on white, no, you have to find it, you have to find the colors, the colorations. Okay then. While you're figuring out the colors, the sea is giving you an OK.

[00:42:58]Plate. While you're looking around, Luiz, I'll ask the staff to continue presenting, okay? We'll come back at the end of the live stream with what you're putting together, okay? Figure it out, do your thing, do your somersaults, I want to see if you can pull it off, okay? Come on, let's do it. Did you find it?

[00:43:17]I'm trying to find the Grenado challenge, people who are in the chat. Is this asking for RBR RGB or is it RGB? The RGB codes for Grená. Hello. It's 128. Put 128 there.

[00:43:38]128.

[00:43:40]Wait a minute. It disappeared.

[00:43:43]So in the meantime, I'll ask Mauro. Oh, calm down, everyone. Mauro, hey, we can do that, show you what you did while we figure out the RGB.

[00:43:52]28.

[00:43:53]Let me see if you 're a zero.

[00:43:57]Let me share my screen here. 32.

[00:44:01]Hey, let me see if I can share my screen with you here.

[00:44:06]28,032.

[00:44:08]Did you manage to get it, Luiz? 032. While he shares the screen.

[00:44:12]Window here. Ready. To share.

[00:44:16]Well, I'm going to send it now.

[00:44:18]Let's see if the color will come out, okay? While I grab the screenshot here from our friend Mauro, we'll then look at the license plates that Burgos added today while compiling.

[00:44:46]I can't switch screens while the other one is still there. Luiz, no, Luiz, you didn't get the code. Pull out that red one. You know that code for red? You didn't pull up 255, 255, 255. Pull it up again.

[00:45:01]Higher up, higher up. Go ahead and switch it.

[00:45:05]Yes, that's it. Put it in the white man's hole.

[00:45:08]You have to fit it inside the little hole in the white one.

[00:45:12]But now, wow. Click and drag the screen to the side. No, you can pull the code, but that's fine. Put it there, speak up.

[00:45:19]What's the code, Evair?

[00:45:21]128.

[00:45:22]128 Zero.

[00:45:25]Zero for green.

[00:45:28]32.

[00:45:30]32 of the blue. Hey Luiz, pull down that red block over there. Now you're going to fit it inside the white one.

[00:45:37]Drag it again. Luiz doubled it.

[00:45:41]Delete one.

[00:45:41]I'll leave it here, safely tucked away as a cheat sheet, then. Okay. Pull him, pull him. Fit it in there. Let go. Oops, again. There you go.

[00:45:52]Now upload the code, okay?

[00:45:56]Taran. And that loose guy isn't going to cause trouble? No, no, no, it won't work. He doesn't consider it.

[00:46:02]Clop-clop. It is good.

[00:46:05]That one is a bug. It's going to be a little hobble. It will take him a little longer. No, let's continue as before. Let's take it off. Did it work? Oh, oh, oh. That's enough. Show it to me.

[00:46:17]Oh yes. [laughter] Engage.

[00:46:25]Great, great, Luiz. Top. Congratulations.

[00:46:28]Congratulations. Just kidding, just to demonstrate the electrical part of the K10 and the environment we put it in for block programming. Then in the next few years we'll start evolving to look at the sensor part so we can make our little farm there, right, because we're really just going with your random project and the farm. We're going to need help from the community to work on the smart farm.

[00:46:55]Awesome, Luiz.

[00:46:56]Well, stick around because we're going to have a lot of news coming up with the K10. I think. Come on, let's see what happens with the last thing, do you have any idea how much the K10 will cost?

[00:47:08]Yeah, it'll be in the range of R$350, R$ 300.

[00:47:11]Uh-huh. Here it is, already in our hands.

[00:47:14]It's Brasília land.

[00:47:16]Brasília lands.

[00:47:17]R$ 360. That's perfect. Good to know, Luiz.

[00:47:22]Oh, where against M Plus. Yeah, I'll send you the link later because I don't know either.

[00:47:27]Long live Moca, Luiz. Beauty. Write this down: Juventus is second in Serie A.

[00:47:33]Meanwhile, World Cup.

[00:47:34]Heading to the World Cup. And truth. We no longer have analog PowerPoint; we have digital PowerPoint.

[00:47:40]Okay, so today's PowerPoint presentation is going to be digital because I couldn't print it. I'm kind of isolated here, okay? So I couldn't. But within the scope of my work, my mission today is, I mean, my mission is to work with the robotics aspect, okay? So, in the three previous sessions, we presented on the motor control part, right? And there's one thing that has always caught my attention, and that's this issue of sound effects in car audio, okay? I've always been fascinated by how people manage to create realistic sound effects in these model cars, you know? So, based on that, I did some research and looked into how we could implement it here in KMI, okay? And one thing I discovered, of course, was that here in Brazil, it's impressive, folks, we have several courses taught by specialists who teach how to work with this aspect of realistic sound. So, we have specialists, we have training programs, consulting services, okay? So this is a really cool thing and you can research it, and I'm also available to answer your questions. In my learning process, I also discovered that there is a Swiss person who calls himself, you know, The Itelf9.

[00:49:10]He created a project that he calls RC, heading towards the SP32. And it's interesting that he's of Swiss origin there. It even provides hardware, you know, to reproduce that realistic sound aspect. But there's one thing: since this hardware was developed back in the 2000s, it still uses the DAC audio processing method from the SP32.

[00:49:37]He's using GPIO pins 25 and 26 there. And another thing, he's still using the Arduino IDE, version 1.0.

[00:49:48]In other words, to use this library, you have to downgrade Edued Arduino to version 106, whereas today we're at version 338, okay? That's an inconvenience. And what 's great about his library is that today he has 80 vehicles registered there, okay?

[00:50:10]So there's Volvo, Scania, Caterpillar, and over 500 effects ready to be reproduced, okay? So, for anyone who wants to work today, this place is ready. What was my job just now? I was updating the sound simulator, okay? So I made an update. Instead of using that DAC, right, from GPIO 25 and 26, I said, I'm going to do an upgrade. I'm going to switch to the I2S Max 98357A module now.

[00:50:53]And I also wanted it to work with the idea of ​​the last level 338 Arduino, okay? And another interesting thing is that it would have to be compatible with the existing library. So, what did I do differently? I even presented this project a few sessions ago, but back then I was going to retrieve the sound directly from the library and play it, right? Not now, I did something different. I wanted to use those 80 cars, the vehicles are already registered. Select the vehicle and it will show you the list of starting, idling, horn, siren and many others. So I included those four effects in this demonstration. I wanted a start, idle speed, horn and siren, okay? So that's what I'm going to do now, switch the camera here to show you. So let me go back here to the camera now, change the camera here to Ah, tabras.

[00:52:10]Okay, it's there. Yeah, cool. So, folks, here's what we have? I have the KMI here.

[00:52:20]This is the I2S module, okay?

[00:52:24]So I put a potentiometer here to simulate the variation in speed.

[00:52:31]A switch turns it on and off. There's a button here that I'll use to select the effect, one of these four effects. And here I have the start and stop buttons for the sound effect, okay? So, for example, here, I'm here at the first effect, which is a truck starting.

[00:52:59]Can you hear it?

[00:53:02]No, I think it's just a cancellation of, maybe, Streamyard.

[00:53:07]I heard it, but it was very quiet, okay? That's one of the effects, okay? I can now select, for example, another effect here.

[00:53:19]It sounds like a horn. Horn.

[00:53:21]A horn.

[00:53:21]This one is the one with the horn.

[00:53:23]I can change another effect to siren.

[00:53:27]Oh, now you can listen.

[00:53:33]I'll stop now. Back to low gear now. Oh, this is the effect of idling.

[00:53:43]Yes, it ends up canceling out the noise. Machal cancels. It only shows at the very beginning.

[00:53:49]And I can accelerate, look.

[00:53:52]Yes, unfortunately it's cancelled.

[00:53:54]I think it's because it's a fixed frequency, right?

[00:53:59]Ah, that's an option. Okay, then.

[00:54:01]No problem, Mauro. Heat up the condom. Okay, so I can stop now, right? So this, folks, is a platform for sound simulation, okay? And then, of course, we can put this in a cart and actually add sound effects, okay? So, I hope, until the end of this session here, right?

[00:54:26]We'll present a robotic car at the end, okay? So that's the idea. Uh, let me take advantage of this moment to say something, [laughs] uh, I wanted to do something, announce something here, look. Last week, I announced on the website what I called the KMI methodology for bringing the classroom to the home, okay? So, Renato and Luiz, we went to Bet Brasil, right? over at Bet Brasil. What did I realize there, what did I learn from our visit there? The thing is, the people there were selling methodologies that are expensive, the kit is expensive, the kit is proprietary.

[00:55:15]Then I said, "Wow, KMI is all set up today to do something like this, you learn in the classroom, but the student can reproduce it at home. So, I announced this methodology, okay? So, uh, it was cool because if you can, let me even see here, look. Let me grab it again, go back here to the screen.

[00:55:46]To the screen here, look. Okay. You, let me see here. No problem.

[00:55:52]Can you show this screen here?

[00:55:54]Ah, the screen is going here, look.

[00:55:57]No, it's in the sound simulator.

[00:55:58]It's in PowerPoint. It's in PowerPoint. But I already changed it here. How would I change it here again?

[00:56:05]You have to get to the presentation.

[00:56:07][clearing throat] Uh, while I'm talking, very cool, Mauro.

[00:56:10]You can also make sound effects for electric trains. There's an interesting market of people who collect models and electric trains. Yes, just like Enaldo mentioned for the model-making people, Aldeir, right, he has a lot to talk about.

[00:56:24]But relax, Mauro, you can show us tomorrow if you need anything.

[00:56:26]I'd like you all to take a look at the kitmodularot.com website, the link is in the registration, and check out this methodology.

[00:56:37]The idea is that there's already a booklet with 20 lessons, okay?

[00:56:47]Twelve are basic and eight are robotics.

[00:56:50]Hmm.

[00:56:51]Let me just get back to my camera here. A little modular moment, just getting my camera back here.

[00:56:58]It's links to the practical lessons. That's it.

[00:57:00]Yes, let me just get back to mine.

[00:57:02]I'll put it here in the chat. Then people can copy it. Yes. Put it in. It's already here.

[00:57:09]Perfect. No, I'll have to extend it, Luiz. Today we already asked the Instagram team to come here. The Instagram team to come to YouTube because we'll have another 15 minutes of video today, okay? Because we need to see it.

[00:57:23]Now you put the background.

[00:57:25]Yes, speak Mauro. You can continue. Can you just show us at least the screen from kitmodularot.com.br, just to... Show this main screen here.

[00:57:34]Look, okay? So, everyone, look, the idea is really to transform learning, okay? So, there's a free booklet available with 20 basic lessons, 12 basic and eight on robotics, plus half a dozen on connectivity. And it's also important, look, scroll down a little. There's a spreadsheet, look, there's a spreadsheet with a materials list, where the material is related to the lesson, how much it costs, and where to buy it.

[00:58:15]This is great because you learn in the classroom and take it home. It's so cheap and feasible to reproduce in class. And yesterday I even posted the things from the motor control section. It's quite incremental, so take a look, okay? It's free, it's available there. So, spread the word to the schools, okay?

[00:58:44]Perfect, perfect. Look, I'm going to put, I'm just going to copy the website, and then, everyone, just click on the link I'm putting here, which I just sent from Google Drive, which is for photos from the Mouse Road Show, but no, this one is from the modular kit and it's right there, okay? Oh, dear, thank you, Mauro. We'll talk more later. And then I 'll bring Burgos here. Burgos, what boards do we have today, Burgos?

[00:59:12]Before I show you this kit from Mauro, it reminds me, it has a similar philosophy to the K10, right?

[00:59:21]Yes, yes, yes.

[00:59:24]Same same scheme, right?

[00:59:26]Same style, right? The difference is that the K10 is all together, Mauro's you plug in, right? You plug in the sensors, and the K10 is embedded, right? Things are embedded in it.

[00:59:39]They are embedded. And then they had the brilliant idea of ​​replacing the word embedded with embedded.

[00:59:46]Speaking of which, on the 12th, the KMI will be there for everyone to tinker with.

[00:59:53]You can go there.

[00:59:54]It's at the event, right?

[00:59:57]The Cimi will be at the meeting. It will be at the young mechatronics meeting.

[01:00:01]Yes.

[01:00:02]It is. Yes, C is turning one, there's going to be a party, Maura, she's going to bring, she's going to bring the cake for us.

[01:00:06]It's true. One year of Caimers. It's the same, it's the same as the event at, it's the same as the event at Embarcados.

[01:00:13]Renato asked me if I wanted to go on the second, if I wanted to go to Embarcados to say: "Of course I'm going, I'm going to see my friends and to eat, because an event without food isn't kind of fun, you know?" [Laughter] " It's our cafeteria theme."

[01:00:28]Oh, it's cafeteria theme. Let me, Renato, can I show you something quickly before we talk about our secret project?

[01:00:36]Look, folks, speaking of KMI, speaking of K10, embedded systems, the Internet of Things, right, which are modern technologies, right?

[01:00:47]So we're going to talk about a super modern technology, which is this one here.

[01:00:52]Ah, vacuum tubes.

[01:00:54]Yes, so, modern technology, speaking of modern things, right?

[01:00:59]So, the book, our book here, "The World of Vacuum Tubes," the book I wrote together with the great master Nilton Sebraga, the editing was done by Renato from the Nilton Sebraga Institute. The book is very beautiful, the book is very good, very easy to read. For you who like vacuum tubes, want to learn about this electronic component, right, that started the era of electronics, if it weren't for the vacuum tube, there would be no KMI, no K10, none of this, right? It started here, look, it all started here, okay? And there are still vacuum tube devices. In the market.

[01:01:31]For example, amplifiers in the music field. Many of them are vacuum tube amplifiers, right? Vacuum tubes have a clean sound, a very beautiful, very cool sound. And they also have transmitters, right? So, for those who are going to repair old equipment or vacuum tube amplifiers, right? Or for those who really want to learn about the component, look, here's what you can buy at the Newton Cebraga Institute, okay? The QR code is appearing there. You can buy it at Estante Virtual, Clube dos Autores, Amazon, and there are some other distributors, okay? Great. Very good. Great.

[01:02:09]And microwave ovens, right, Burgas?

[01:02:11]A microwave has a magnetron, which is a vacuum tube, right? A special vacuum tube. Well, folks, here's the thing, my friend Evair from São José dos Campos and I are working together on a project that will be a power amplifier, a super cool amplifier that we're going to take to the Young Mechatronics meeting, an amplifier with an integrated circuit, the amplifier... Renato, I left a little diagram here, you can upload it for us.

[01:02:46]Look, the schematic is here. I'll show you the schematic. Then I'll show you the board quickly. Just grab it here, see. 05, see. It's here. So, this is an amplifier. It uses a TDA 2005.

[01:02:59]Inside it there are two amplifiers.

[01:03:01]And these amplifiers are bridged. That means each one is connected to a terminal of the speaker.

[01:03:09]So the audio signal will enter pin one here, pass through this amplifier, go to a pin of the speaker, and this same signal that goes to the top pin of the speaker will pass through a voltage divider here, where a small part of it will be amplified by the second amplifier and will come out negative here at the bottom terminal. Therefore, if the top terminal is positive, the bottom terminal is negative and vice versa. This setup here is called a bridge connection, where you connect the same speaker to each output of the amplifier. What is the advantage? That you have the power of both amplifiers. combined without needing a very high supply voltage.

[01:03:52]For this circuit here, we're going to use a TDA 2005. This circuit will give approximately 20W of effective sound to the speaker, okay? And I want to show you the board now. The board is here, right, which I made in Isieda.

[01:04:08]Uh, this will also be in the mechatronics magazine, right? So if you want to assemble it, you can. And now I want to show you the finished board here. We already have the boards ready here that we're going to make. Look.

[01:04:24]Here's the amplifier board, you see? Here's the output, the TDA 2005, we have the signal input terminal, the power supply terminal, and the terminal connected to the speaker, okay? And this amplifier here, it's for one speaker.

[01:04:47]For an external stereo amplifier, right? In this case, we'll need two boards, each connected to a speaker, okay? An amplifier with an integrated circuit.

[01:04:58]Which What's new about this? Evarir is going to build a metal box for us to put these boards inside. And these boards, the output IC, it's an IC that has a heat sink, right?

[01:05:11]So we're going to screw it into the box, and the box will act as a heat sink for the two amplifiers, right? The two amplifiers here.

[01:05:21]And in addition, we're going to put this module here in this box, which is a VU meter with LEDs, right? It has 10 LEDs. The audio signal will enter this board, go to this IC. This IC will activate 10 operational amplifiers so that they will make the LEDs light up sequentially according to the sound intensity. If the sound is low, two, one, or two LEDs will light up. As the sound increases, the number of LEDs that light up will increase, okay? So, as the sound moves, right? So, the LEDs will follow the rhythm of the music, like those magic eye tubes, right? Except here it's with LEDs, okay? That's really cool, really nice. It's adjustable too, you can do that. This will be part of the amplifier we're going to build, right?

[01:06:12]And finally, the amplifier will also have a Bluetooth module. Really cool, really nice, right? It's a class AB amplifier, which is a class AB amplifier, a slightly older amplifier, right? It produces a reasonable amount of heat and already uses Bluetooth technology, which is a new technology, right, that we're going to put in the device. So, we'll have this amplifier with two separate modules inside, right? And its power supply will be external. Uh, there won't be a power supply inside it. The power supply will be an external one that we'll plug into the speaker box and make the circuit work. There will be two speaker boxes, right? So we're going to take this module to the mechatronics meeting. Evair will build the speaker box, right? He'll say something like, " Poor guy, he'll build the workbench, build the box, [laughs] he'll build everything. Oh, he'll build it." The little box. It looks really cool.

[01:07:12]Hey Burgos, uh, this amplifier is very similar to a vacuum tube, isn't it?

[01:07:16]You already made a vacuum tube amplifier that you took to the event, to the book launch. Speaking of which, Carlos bought the book this week, he wanted to let me know.

[01:07:24]That's great.

[01:07:24]We'll have it at the meeting. This Bluetooth amplifier, Leo's microphone, which can be connected right there on the workbench to measure the signal.

[01:07:34]His microphone here, look.

[01:07:36]So, great.

[01:07:37]Everything's integrated.

[01:07:39]Everything's integrated.

[01:07:40]And we can also take the sound from the KMI, put it in the input and transfer the audio via Bluetooth, look.

[01:07:47]Via Bluetooth to the thing. There will be, look, this will be the IoT meeting, actually, right? Everything will be connected. These random projects, suddenly random, it seems like there's nothing there. [laughs] That's true.

[01:08:02]Yes, randomly everything is interconnected.

[01:08:04]Yes, randomly randomly speaking, one kind of complements the other.

[01:08:12]Yes, exactly. Or connects with another, right?

[01:08:15]Okay, so this amplifier that we're going to build has two power outputs.

[01:08:23]It has the LED module, the Bluetooth module, and the box, which will be a work of art by Evair, right?

[01:08:33]Everything Evair makes is a work of art, is n't it? So he's going to make a really nice little box to put our... one question, Bos. Will you be soldering during the live streams? Will we see you assembling these boards during the live streams?

[01:08:47]Okay? By the way, we'll see Evair making the box part and me soldering the components here.

[01:08:56]Then I'll test it here, I'll get it working so that when the box arrives we can put everything together.

[01:09:04]Perfect. Oh, I know we're nearing the end. We just touched on this today, but it's important. Ah, Burgos is making the series lamp that Evair applied to the workbench. However, Master Leéadini, in the bunker where he lives, thought, what if there's no lamp, right? So, Leo explains this here... My friend. He did his thing, it's all connected there. It's all connected. Leo thought, he went to sleep and said: "Hey, I think there's a solution." It's here on the screen. Leo, explain what this is.

[01:09:36]Leo had an idea, but it didn't light up a lamp, you understand? That's it. The idea is a lamp that doesn't light up, it's a lamp that protects. The idea is to transform, to create an experimental circuit that behaves as if it were a lamp. A lamp is basically a PTC thermistor, right? When the current, when it heats up, the current decreases, and this circuit has a similar purpose.

[01:10:05]Notice that transistor T2 is forward biased R1 R2. So we're going to calculate these two resistors to saturate T2, and it has n't been calculated yet, right? That's it. This circuit is totally new. And this is just the prototype project, right? It's a prototype of the project.

[01:10:26]Then we have a differentiator R5 at the emitter of T2 that takes the sample. The current passing through T2.

[01:10:37]Perfect.

[01:10:37]This voltage derived from R5 will, through a time constant, polarize T1.

[01:10:47]So what happens? As time passes, T1 increases the current across it and reduces the polarization of T2. Notice that T1 cancels, cuts off the power supply to T2, diverting the polarization of R1 and R2 here.

[01:11:06]And what is the consequence of this?

[01:11:08]It will behave like a lamp. Initially, the current will pass freely through it, through the circuit, but as time passes, it cuts off the current as a function of the current, of the load that this circuit will receive.

[01:11:27]Perfect. Will it work?

[01:11:29]Yes, we can.

[01:11:30]Now we have to assemble the circuit.

[01:11:33]I've never seen a circuit like this.

[01:11:36]Leo, what's the next step in this circuit? What are you going to do? Are you going to calculate it first or go straight to the breadboard? What will be the next step?

[01:11:46]It's finding a component that works for it. [laughs] That's our biggest challenge right now, getting components that work, okay? That's a big dilemma too. I recommend Mouser Electronics, okay? It 's not the time to advertise, but hey Leo, so, uh, let's... I'll put it on the screen again. Guys, take a screenshot, copy this screen or pause the video.

[01:12:12]Do you know how to calculate this circuit? There it is. And then in the next video, Leo, we'll calculate this.

[01:12:20]Okay?

[01:12:21]So, uh, the idea, T2 can be a Darlington, right? It can be a Darlington, it can be two transistors, it can be just one, it will depend on the gain of the transistor you choose, right?

[01:12:31]Right?

[01:12:31]There's also a Darlington, it can be a transistor with a higher gain, right?

[01:12:36]So the difficulty is actually getting the components, right? I'll have to search in the stores, right? See what's possible to find and what's possible to make work, right?

[01:12:48]This is a PTC. Electronic.

[01:12:50]Exactly. An electronic PTC that simulates a lamp.

[01:12:55]Yes, Burgos will make the lamp and Leo will make the one without the lamp. He will, he will make the circuit.

[01:13:02]The one without the lamp.

[01:13:03]The one without the lamp. Okay. Perfect.

[01:13:06]Great. Look, everyone, we're reaching the end and we're going to say goodbye, and if we need to give a message, we'll send it directly, okay? The first question I'm going to ask, Nicolas, we learned a lot today. I learned.

[01:13:17]Uh-huh. Today was a very complete class.

[01:13:20]Great.

[01:13:22]Luiz, did what you wanted to do work out?

[01:13:27]Oh. Oh.

[01:13:28]What, see you tomorrow at 8 pm? Oops.

[01:13:32][clearing throat] See you tomorrow at 8 pm. Good, Luiz.

[01:13:35][laughs] Wait, wait. You have the block here. Let me see how it turned out.

[01:13:42]Yes, you added some lines there. You made several. Good. Lines 5, 6, 7 and eight.

[01:13:47]Great, Luiz. Great. Ah, you put the Maroon in the background, look. Lots of changes.

[01:13:52]We see. He changed the background color.

[01:13:55]Congratulations, Luiz. You're getting good at this. You 're learning. It even reminds me of the color of the shirt when it was maroon with white lettering.

[01:14:04]True. Look, Leo, Aldo Alberto put here at the input, you can use a TC, but I think you need to dissipate the power in a short circuit, okay? OK. Let's go.

[01:14:14]Goodbye and see you tomorrow. Burgos with you. You 're first in line there.

[01:14:20]Don't miss the amplifier assembly we're going to do, right, for the mechatronics meeting, and at the same time we're going to make our series lamp, right, a simple circuit that we use to protect the device from burning out too many things if it's short-circuited, right? So let's see, let's see how it's going to turn out. Oh, there's an important detail I forgot to mention.

[01:14:50]On Friday we won't have a live stream on the Bugos Eletrônica channel, because this Friday I'll be... Eletroncast, the podcast by Mário Pinheiro from CTA Eletrônica.

[01:14:59]Oh, great. It's also my birthday, right?

[01:15:02]My birthday is this Saturday, isn't it? But Mário Pinheiro's podcast is on Friday at 8 PM on Mário's CTA Eletrônica channel. I'll be there this Friday. I'll be talking about teaching electronics, my time at Aladin, my time in technical assistance, and various random things about electronics.

[01:15:24]Don't miss it on the CTA Eletrônica channel here on YouTube. There's no link, and by the way, a former student of mine from my time at Aladim will be participating with me. He'll be there with me. Today he runs a large company in Alfaville, in the electronics field, right? And he'll be there with me on the podcast so we can have a chat, the three of us, me, him, and Mário Pinheiro. And I told Mário Pinheiro, "Hey, put some food out there because you know how it is, right? Especially on a birthday, there has to be cake."

[01:15:49]Of course, look. Uh, Thanks, Burgos. See you next time. And now I'm going to ask our friend Evairo for his goodbye.

[01:16:00]Guys, I'm feeling pressured today, huh? The response is high here, huh? The workbench project, the little box, the amplifier box. I have several ideas here, you know, Burgos? We'll talk later. Later we'll send it, send it, send it to me, man.

[01:16:15]I'll send it, then you need to send me the dimensions so we can send you the measurements.

[01:16:20]It's what material I have here that we can use, but I have, I don't know, I don't know about you, but I'm going to sleep and I'll keep thinking about things. Since you, since we talked, I've been thinking about how to use this box too. I need to measure, I need to measure the size of these boards here.

[01:16:33]Yeah. Uh-huh.

[01:16:35]Then we'll make these little boxes, the workbench, and I'll see if it works to make the mini MJ workbench for us to present at the meeting there too. Logic. Let me ask. This mini workbench you're planning to make, is it a kind of model or will it actually work?

[01:16:54]No, no, it's a perfectly functional workbench. The workbench I'm going to make here for myself is 1.60, 1.50 meters. The one I'm going to make there for us to take, it will be 80 cm, but it's already functional, we can put it on.

[01:17:09]Can we connect an amplifier to it?

[01:17:12]Ah, I think so. It will work. We can put a Rigol stylus on top. We can put something cool on it, we can put a... No, if it works, you know?

[01:17:27]If Rigol doesn't participate, I'll take mine there, we'll put it there. That's it. It will look good. I think people will like it. I hope there's enough time. Very cool.

[01:17:37]Yeah, I hope there's enough time.

[01:17:38]Perfect. Thanks, Vair. There will be enough time.

[01:17:40]Yes, yes, yes. For sure. [laughs] Great. Thanks, Mauro.

[01:17:47]Cool, everyone. I forgot to mention that the car audio simulator project is already available for download on the website, okay? You can download, use, and share it.

[01:17:58]Just one message: help spread the word about this KMI methodology from the classroom to the home, okay? Take a look at the website, see the methodology, and then comment, okay? I think it's great for us to help these kids reproduce it at home and really improve their learning. Awesome. Thank you, Mauro. Dear Luiz Viva Moca.

[01:18:25]Guys, thank you for today's lessons, it was really cool.

[01:18:31]Tomorrow there's more, and everyone's together for technological outreach.

[01:18:38]Good night to you all.

[01:18:40]Great. Awesome, Leo.

[01:18:44]Congratulations. Wow. Sensational setup.

[01:18:48]Hey Mauro, your hacking of the Swiss system is incredible.

[01:18:54]Very cool.

[01:18:57]Hey, Luís, your device is sensational.

[01:19:03]And did we miss anyone? Oh, Burgos.

[01:19:08]Burgos's little plates also turned out great.

[01:19:10]Very beautiful. Congratulations. Bye, everyone.

[01:19:14]Thanks, Master Leo. Dear Nicolas. Well, folks, that's it in general. As always, it's an honor to have participated in today's live stream. The projects are sensational, Burgos' amplifier. It was also really cool to see Luís' projects using K10.

[01:19:34]Uh, I also liked seeing KMI's sound projects, Master Leo's microphone also turned out great. All the projects are sensational. And another cool thing is that many of these concepts that you see in some projects, you can also use with others to create something new, right? Well, uh, I would also like to thank the people who commented in the chat, who followed the live stream, and we'll see you next time. Thanks, everyone, until next time.

[01:20:01]Okay? Thanks, dear Nicolas. Oh, folks, we're reaching the end. I'm just going to ask for some help from the community here. Júlia Leb is competing for the female influencer channel in technology education here on YouTube. So I'm going to, I put a link here. No, in the chat, I'm going to ask everyone to click and click on Júlia Leves as soon as the live stream is over, okay? So let's help Júlia win this YouTube award as a technology influencer in the world of women, okay? OK. Hugs.

[01:20:31]See you tomorrow. And as always, what do we say?

[01:20:35]Long live Moca.

[01:20:35]Long live Moca.