 Okay, every single way we do. Great search. Did you keep? What are we looking for this weekly? A great tune. That's right. Now we're the lyrics. So, folks who have been watching the Adafruit site have noticed that we have been going through and STEM at QTF-ing a lot of our sensors and devices. So, you know, the list 3DH, for example, used to be just a plain breakout. We stopped it for many years. It's project ID 2809. But then like two weeks ago, we STEM at QTF-ing it. We added plug-and-play sensors and made it kind of standard 1 inch by 0.7 inch shape. We did the same thing for this VL53LOX and the OLED. So, we've been going through and adding these plug-and-play connectors to make it really easy for people to, say, use it with the QT-pie. They just plug in whatever they want. No sort of required. You can get pretty far without having to worry about any wiring issues. And fellow AdafruitrJP was asking, hey, you know, do you know when you're going to have the STEM at QT version of the NPR-121? This is a very popular capacitive touch sensor, the NPR-121. People in the maker community have been using this chip for over a decade. And we've got a breakout. And you can even see there's even a little bit of space here where we could add the two STEM at QT connectors. It wouldn't even really change physical shape, which would be really nice. Unfortunately, the NPR-121 is no longer made. It's discontinued. Now, there's enough in stock around the world that I'm able to kind of keep the current breakouts and shields that we make available. But you can't buy more of these, really. And I wouldn't design a new breakout using this chip because any day now, I'm going to get news that I can't even get back stock. There's no green market available either. It's completely gone, which is a shame because it's a really nice chip. Not sure why NXP discontinued this. Anyways, so GPS saying, hey, on the next great search, can you show, you know, you showed how to find alternatives when there's like a clear alternative. But what if there isn't like a suggest alternative? What if it's really obsolete? There's really discontinued and there's no equivalent. So I thought, let's, because this is a common thing, let's go over and show what I do and how I'm going to find the alternative chip that I could use to make a STEM at QT breakout. Now the NPR-121 is discontinued. This is so discontinued that like you can't even backorder it. It's completely deleted off of the website. It's still there for record. And you can see that, you know, they do stock our breakouts and there's other breakouts like from DFrobot or Micro-E or Seed. But for the most part, like this chip isn't available. Well, the first thing you want to do is pop up the the datasheet, which I actually have in the tutorial. So I'm going to open the datasheet. So this is the NPR-121 and you want to look at the pinout. And if you're lucky, you'll be able to find a chip that has an equivalent pinout. I will say once in a while you find a chip that's discontinued and there's an equivalent pinout version like the HMC magnetometer, the 5883, HMC 5883 with a very popular magnetometer by Honeywell. They discontinued it and another company made the MMC 5883, which is pin compatible. It wasn't software compatible, but it was pin compatible. If you're lucky, that's available. So let's see. Let's see if we're lucky. So I'm going to take advantage of this product attributes, search again, a very powerful when you're looking for alternatives. So I want to search within the capacitive touch sensors. I don't need to be by NXP. I do want it to be I squared C. I don't care about the inputs. I'll tell you why, because what if it has 20 inputs or 24 inputs? I just want something that has at least 12. So I'm going to actually leave this unchecked. And I do want it to be surface mount. And then, you know, if I'm lucky, it's pin compatible and it's voltage compatible, but nothing else is like a specific. So let's view similar. Okay, so now we're going to again, because we don't want to get stuck with, you know, selection of the NPR 121 again. Let's apply only active. And then, okay, sometimes there's up to 16 inputs or 12 inputs. So I want at least 12 inputs. So I'm going to control click and go through while there's like 150 inputs. It's like some multiplex thing. And let's apply the filters. Okay, cool. So looks like there's, you know, buttons up to 16 up to 8. This is kind of cool. This one is a little nutty. This is like a touchpad controller that also has, I guess, button support. That's too many though. I don't need something like this. And also it's not individual. Like you can tell it's a 48 QFN. You have to have one electrode per connector. So this is it. This isn't probably going to be what I want. So next up, let's do more filters. So all these voltages look good to me because I'm okay with it running at 3.3 volts. I don't want something huge. So I'm going to pick all of these 32 and less. And I think the 72 inputs is kind of bonkers. So I'm just going to select 25 or less. Okay. Well, next up, actually, because I selected all of them, there's a lot more options than last time. Let me look to see if there's any that use the exact same package that this one has. So this is a 20 pin. If you go down to the bottom, you can see the package. Packages are always at the bottom of the data sheet, by the way. So this is a 3 by 3 20 QFN. And we might be lucky. So here's a 20 QFN 3 by 3. And here's another QFN. Note that once a VQFN and once a QFN. What's the difference? I don't know. I just call them QFNs. I don't know what the V sometimes is like very thin. It's like, okay, great. Okay, it looks like there's a couple options here. Cool. These are all up to 12. So let's start with the PsyLabs one. Oh, okay. So when you see this, this happens, you see this big warning. It says not recommended for new designs. That's the thing you got to watch out for. It's still available, but they're basically giving you a hint that like, hey, like, this isn't going to be around for very much longer. We might just continue this at any time. Warning. Warning. I like how they put on every page. So again, let's go to the bottom of the data sheet and find the, sorry, the, I actually don't want to be at the bottom. I want that to be at the top and I want to find the pinout. Let's find the pinout. Pinout, pinout, pinout, pinout. They don't have it here. Hold on. This doesn't drive me on nuts. They should always have the pin at the top. Okay. So look like they have the countries going around here and then pin 3 is ground, pin 4 is VDD. So then we compare that to this and we'll see it's definitely not compatible because you see this has power and ground on pin 6 and 20 like they're crossing each other and this has power and ground on pins 3 and 4. So the CPT 112, first off, it's not recommended for new designs. And second, it's not pin compatible anyways. So we'll keep it in mind but you know it's not recommended. Okay. And then there's more in that family, the CPT series, but it's pretty much either CPT 112s or the AT 42 QTs. So let's check out the next one down which is the AT 42 QT. So this one is by Atmel. It comes in a bunch of different packages, SOIC, TSOP, QFN. And it has two modes, a comms mode where you use iSquared C and then a standalone mode which I really like. Standalone mode is really cool because it lets you basically have capacitive touch buttons that go straight to GPIL. You know my controller at all. So it's like you can plug it into any kind of electronics. But let's look at the QFN. So it does have 12 keys. So you can see key 0 through key 11. So there's 12 inputs. But again, the power and ground, I always just look at those first because if those don't match, I can't make anything else match. These are on pins 8 and 9 which doesn't match the way that the MPR 121 has. So this is a pin compatible, but it is functionally compatible. It has iSquared C. It has the 12 inputs as power. It has iSquared C. It has reset. It has like an interrupt. So you know that's gonna be very similar to you have an IRQ, iSquared C, and then you know a couple other pins and power and then 12 elements. So this isn't a bad replacement. You would have to re-lay out your board, but maybe that's worth it. You know, that does happen every few years. You'll find you can't find a part. You might need to re-spin the board. However, the overall functionality I think is close enough that I would probably pick this as an alternative. This one looked really good, but again, it's not recommended for new designs, which is kind of a little scary to me. I don't want to get involved with another chip that's gonna break my heart. So that's how I found an equivalent for the MPR 121. You're wondering what should I use? I can't get that. Check out the AT42QT2120 series from Atmell Microchip. They've got a couple different packages. I'm sure if you look online, you'll probably find some example code from them or others. A nice 12-input capacitive touch controller. Alright, that's a great touch with this key. We found it.