 and welcome to Desolateda. Hey everybody and welcome to my desk, Happy Sunday. It's been a super busy week, a lot of revisions here at The Fruit, but any updates, Mr. Lateda, anything you wanna tell people before we look at something? No, regular week schedules, regularly week schedules. We're gonna have schedules this week, everyone. Regularly the week. We've scheduled the schedules. No, we're just in revision and new product development as fast as we possibly can. Adafruit was in the news, check out Adafruit.com slash press. You can see the feedback from the buying population of folks who want fairness for purchasing high demand things like raspberry pies. So, Evan, the founder of the Raspberry Pi Foundation and Morris said, way to go Adafruit and others really liked it. So people are able to get the raspberry pies. If you want to get ahead of something, make sure you have an account on Adafruit, verify it with email and then put on two factor authentication. Do not wait till you get the notification. Yeah. Then it's gonna take you like a minute or two to set it up. Do it ahead of time and stay logged in because we'll keep you logged in for two weeks if you have cookies allowed. So this has helped out a lot. And the educators have got back to us they're like, finally, a fair way. There's no easy solution to this. There's no thing that'll just work. It's a combination of lots of different things. So that's the latest. So what's going on on your desk, Lady Eda? Okay, well first up, let's go to the compiuter. So we got a bunch of revisions that we got in. People watch me work on these revisions. So the ESP32 S2 Feather with BME and then the one without BME 280 is going to be in the shop soon. Both of these revise the power to the STEMI QT board, they fixed it. So just watch out depending on which version you have. You might have to set a pin higher low to enable the QT port and the pull-ups. The ESP32 S2 QT Pi also got revised with the UFL. This also improved the low power. STEMI QT, vacation of the ADXL 345, a really old sensor board, but finally getting a cleanup revision. It's been, you know, it's one of our first boards that we've had. It's product number 1231, so quite old. The BLE Sniffer also getting revised to use the CP2102N, not the CP2104. Ditto the Pi UART, also USB-C and CP2102N. And the PCF 8523, we showed this off a few weeks ago doing the revision. The board now comes with either SOIC or VSAN version of the chip. The SOIC version, you know, might be a couple months out. So the VSAN version or HVZAN pin compatible, basically, you know, function compatible, just slightly different shape, but we just crammed onto the board and made the crystal smaller and we're good to go. So these sold out, but we'll have more and then a couple new products on the way. But a lot of our visions, we're fighting really hard to keep 90% of the products that we make in stock. You know, that's our goal and we're trying really hard to do it. We did get a couple more chips that we've been desperately trying to, you know, we've been out of stock for a year on and like we slowly dwindled through our supply. So we're getting a restock of those and we'll be able to get, I think, some, I'm used back into the store and some sensors. So that's good. Also, while this is happening, I also checked out there's some nifty new chips that I saw, so VL53L4CX. This is in stock, he did your key and this is yet another time of flight sensor that he making these, but I keep buying them. So this chip, what's nice about it is it's got a six meter range compared to the VL53L51CX, I think, which has a four meter max. So this one has a six meter max range. You know, fairly good price, about three bucks or so in quantity. So it's kind of neat. Also got samples of this, the LPS-28. There's not a lot in stock, but you know, I got enough to put a type with. This is interesting because this is a barometric pressure sensor that can do up to 4,000 hectopascals, HPA. Usually 10, 60 or so is the max. That's kind of like, you know, C-level pressure, a little bit below C-level pressure. So this one can do four times as high pressure. So it could be good for underwater use cases. I think it was designed for underwater watches. It's also waterproof, not the whole body of it, just the gel insert for it. So this interesting sensor, I kind of quickly put together a breakout of a STEMIQT for the sensor. I also got some on the overhead, maybe you don't check it out. So yeah, I got some of these samples. So this is the, it's so tiny, but this is the LPS-28. So it does have a little, you know, it has a little ring that you can, you know, put a tube on, so it's not flat. It's got a little ferrule on it, but anyways, I got that. And then I did get some of the VL-53L CXs and I swapped out, I just hot aired off. Maybe I think Dana or Vance did and replaced it. And I tried out this chip. So it's actually multi-target and up to a six meter range. So that's good. Any questions, Phil? Nope. Okay. So far so good, keep going. Yeah. Next up, also I got this motor driver chip, which I thought was kind of neat, the DRV-8231. This one is 33 volts and 3.7 amps. We're having trouble getting some H-bridges from TI, so that might be a good alternative. Is there anything else on the list for me to cover? No, we were gonna show this book. I got this book from 1969. This is computers or history and how they work, but this book came out in 1969. So basically the history was like, here's the computer that we have at this time. We have like four of them. So it's a cool book and we're gonna scan it in because I don't think there's any archive.org availability of this or something online. Yeah. But it has a lot of interesting concepts that are still used to this day. Yeah, like they're like, here's binary. And they have old machines and punch tapes and stuff. I'm gonna put a link in the chat. So there's one blog post I found online that someone, no one talked about. Yeah, this talks about checks and how they use magnetic ink to read the check number. So stuff that still happens now. We still, I mean, a lot of people don't use checks anymore, but you know, you still, you know, once in a while you write checks, maybe you'll write as a check. We use cash at the Cracker Barrel. Lady and I, I took Lady A to the Cracker Barrel on Saturday. She's never been to the Cracker Barrel. I took her there and we paid in cash. Yeah, cash. This is a gift flow chart. So it's kind of cool and they're like, here's symbols. This is a punch card symbol. This is a perforated tape, a communications link. I like that. Yeah. It's a cool logo. It's not that many pages either because there isn't that much history. Yeah, so I thought it was cool as they had a whole section on core memory. And so this actually kind of got me interested. I looked up, because it's like quite a bit. Actually, they have quite a few pages on core memory and they have some nice photos. You know, I looked up and there's people who still make core memory from scratch. You can do it with just some wire and some ferrite cores. So we can go back to the computer. And I can, so like this person, you know, bought some core, they basically used, you have to use a really powerful transmitter. So they used a SN575, oh, pardon me, which is a, I think it's actually a H-bridge. So you need to use quite a powerful driver to drive the two lines for whether you want a zero or one and then the sense wire is much lower power and they just did it with some assembly and some transistors. And this is like, you know, they have like one bit of core memory. So I thought it could be neat to show, you know, and this is, they have some pulse, they showed the pulses look like as well. And then there's a computerhistory.org has a whole section on core memory, including, I guess it's Mr. Wang of Wang Computers, it's cool. And, you know, the core is a core memory sample brochure from FabriTech Computer Systems. So I thought for the, for, you know, I'm an API, I could show, oh wait, there's one more chip. I found this, it's interesting, a environmental gas sensor that I might check out, but I thought it'd be cool to show. Yeah, for great search, we'll- Finding, maybe not, you know, the smallest core memory toroids, but ferrite cores are handy for all sorts of things. So- And then we'll, got a question we'll do right after great search. Okay, great. Let's kick it off the theme song that's in our heads permanently now during this part shortage. The Great Search Roger by Digi Keen Adafruit, lady editor of power of engineering, every single week to find the parts that you need and boy, do we gotta find some parts. There's a lot of parts finding- All right, so if someone wanted to find this, specifically from, they read this book and they're like, oh, you know, what's going on with- Yeah, so this is, I was showing this earlier, but this has a whole section on core memory and how to build it and how it works. And so I start to look online, because you know, I've always heard people make core memory. Let's go to the computer. So, you know, you make it by getting some magnet wire, some thick magnet wire, some thin sense of magnet wire that's woven through and then these little magnetic rings and the way that these rings twist will determine whether the bit stored is zero or one. So, you know, nowadays, we read and write memory by putting charge on a capacitive gate for transistor and then we read that charge later. And that's basically how SRAM and DRAM work and it uses a ton less power and it's a lot faster than magnetic core memory. But I think it's funny that, you know, it's like now we use capacitive storage, but we used to use inductive storage in a sense. So while, you know, people don't make core memory the FabriTech computer probably doesn't have, you know, these ferret cores available anymore, although like these are amazingly tiny, only 14 mil, which means you could cram, you know, so much core memory into like, you know, a square inch. But you know, people need to store data and you know, if you want to store dynamic information, this was how it was done before we came up with a capacitive storage. So let's go to Digikey because, you know, even if you're not making core memory, it is useful to know that you can get ferrite cores at Digikey. I used to wind my own inductors for class or because I was making an amplifier, you know, or something or a filter and I'd wind my own inductors. So let's search for ferrite core. Ferrite core. So they're actually not called cores anymore. They're called toroids. I mean, they are called core, sorry. Sorry, I was searching for magnetic core. They're not called magnetic core. They're called ferrite core. And ferrite cores, actually there's a whole, there's a whole section called, oh, magnetics transformer and inductor components. This is kind of handy. There's three sections, there's the core, there's the magnet wire that spools around and the bobbins, these are holders, things that you can store your beautifully made inductor on. So I'm gonna purchase these, but maybe one day we'll cover these on the great search. Anyways, we're looking for ferrite cores. And there's all sorts of kinds. Like there's pieces and ferrite cores, again, they're used for a couple of different things. One, you're making your own inductor. You're making your own transformer. While in general, you tend to purchase these pre-made, there are times when you really have to DIY it for some reason or you're prototyping and you want to try different inductances instead of soldering in different inductors, you'd actually just change the number of coils in your wire. Of course, they're also really handy for reducing EMI. Having a magnetic core around a wire, you've seen them, like it was a big cable with a big lump in it, that reduces the amount of electromagnetic interference. So used for a couple of things. There's more, all sorts of shieldings. I don't know what this E shape is for, maybe also for the ribbon wire, I don't know. Actually kind of neat, we have the Apple II disc drive. It has a gigantic chunk of ferrite core material on the cable as well, because there's a non-differential, so lots of EMI. So they're all very neat, but what we really want is like this kind, which is called a toroid. It's a donut shape, but they're called a toroid type, so let's look for, also let's also look for only active ones. And then there's a lot of permeability and cross-section, we're not gonna care about that. We're just gonna look for the smallest possible one for again, DIY core memory. So let's find where the shape is. Core type. So we're gonna go for toroid type. Boom, okay, so there's a couple hundred of these, but yeah, now we're talking, these are all the same shape and size. And we want the minimum size available, which would be the diameter. So they do come quite small. I mean, you can get them as small as a tenth of an inch. Let's look up to about five millimeters maximum. Again, we're not gonna make the tiniest ferrite memory, but if you're just DIYing at home. Okay, so let's see what's available. So there's a lot of different ones. Some have photos, some don't, but we don't really need the photo. Let's look at them by diameter size. So I just sorted, oops, I went down to the diameter and I sorted up by diameter. So unfortunately, some of the smallest ones are not available. So the smallest available one that is in stock, so if we wanted to filter by in stock, not a lot in stock, but the ones that are available for size three millimeters, the smallest, and it would be this one. So there's no photo, but not too scary because we kind of know what these look like. There is a data sheet and it looks like this. So yeah, it's just a little torrid that we can use. And if you want a photo, because you wanna really, sometimes I'd like to see what I'm buying. Hold on. Uh-oh, my internet is. Do we run out of internet? Oh no, my internet's not internetting. Oh wait, there it goes. Okay. The smallest- The internet storage, internet supply chain. I know. The smallest one that has a photo is this one and there's also a lot in stock. We can look at a 360. But look, if you need a small toroid, you could, four millimeters is, let's see. I always like to compare. Yeah, so like three millimeters, you could, you know, if you wanted to make a small, you know, a tiny little core memory sheet, you could probably use that. Four millimeters is not that much bigger. So either one would be good. And they're both pretty inexpensive. Let's go zoom in. I'm zooming in. Okay, this is now quite big. But both are pretty expensive. You can get them, they're about 10, 15 cents a piece. So yeah, I don't know how many people out there are interested in making, throughout memory, but, you know, if you are making a very small inductor, like a balan for like ethernet, or, you know, for a small boost converter or filtering for like a classy amplifier, you can still find these quite handy. You know, like put a little bit of magnet wire through them and you know, you've got a very small inductance, high current inductor, for sure, definitely more high current than a chip inductor. So I, you know, I don't know if I'm going to actually make a piece of core memory, but this is, oh, my internet's down again. Yeah, I don't know. The internet's been, it was slow. There you go. Oh no. Civilization. Here you go. Okay, so this is the product I picked for the INMPI. So this inductor, I like how it has a little 3D model available, but they also have tons in stock. So you can make up to, you know, basically 10 kilobytes of core memory using what's in stock at the Juki right now. How many is that? And that is a great church. All right, so let's do a couple of questions that came in. Sure. Question, the aid for your TSC 207, I swear to say, resistive touchscreen controller, would it be horrible to use liquid electrical tape over the ribbon to connect the touchscreen for a little support from it coming out? Anything better to use? Well, you shouldn't have any pressure on it, but you could just use some tape. Okay, and then some picks from Cracker Barrel, the Lemon Pepper Grilled Trout, and Mama's Blueberry Pancakes. Okay, next time. Okay, let me see if I've got anything else here. Yeah, someone noted that the core memory was manufactured by hand by women during the 50s. Yes. Yeah. You want to weave your own. Here's a little bit of a tip. Old UPSs are a good place to scavenge high gauge wire and larger turrets. Hmm, that's a good idea. That's a good tip. You're gonna get them there for sure. There's big power supplies, they're gonna have lots of coils. Yeah. And then, I don't quite get this question, but maybe we can try. Hello, lady, I have a question. You program in the Texas Devices Beaglebone and Tiva C Series or other industrial certification and use no Arduino and Raspberry. Don't, I think there is a translation. Yeah, I don't actually do that much Beaglebone. We do Raspberry Pi, but you can use circuit Python with Beaglebone. I would like to refer to Beaglebone as Texas Devices. The Texas Devices, yeah. I think it's a translation issue too, I think. Yeah, I think they cut and paste it in there. I don't know what the question is, but I think we actually are gonna get some Beaglebones in stock also. I think they just recently shipped. Yeah. So, if you can't get Raspberry Pi, you can get a Beaglebone. All right, and I think that is all of the desk of lady at a questions for tonight. Thank you everybody. We'll be doing our shows during the week. We have lots of surprises in the store and more. Thank you so much for being part of this adventure with us every single week. Chicken fried chicken. Yeah, oh, and then one little slide now for our community here who pays close attention. So we were asked, like, hey, what is it if you're doing to maybe solve world peace? There's conflict and Ukraine right now. And so right now we put up a resource, Adafruit.com slash Russia, and that's available for everyone. But also if you go to our website from Russia, it goes directly there. It has mirrors for downloading Wikipedia, tour ways to get around the government censorship. So people in Russia, the population, can get information that they know what's going on. And then also a message from Arnold Schwarzenegger and the State Department, they work together and just trying to get some information and news out to them. And I was thinking how, what a remarkable time when Arnold Schwarzenegger is now the only person that can help bring in world peace on a global stage. So check it out. We're still working on more stuff so far so good as far as the feedback from some of the people on the ground there. They need help with things like access. So I don't know how this is gonna end, but I'm hoping it will end with everybody coming together so we can all build and make stuff as one. All right. Thanks everybody, have a great week. Bye.