 Welcome to LA Data. Hey everybody and welcome to my desk. It's a nice Sunday evening. We had a wonderful long weekend together, went for some nice long leering done before we jump into that. Is there any news or updates from Mr. LaData? No, there is no Emmy category for live electronic show yet, but maybe the Academy will reconsider next year. Okay, well a couple things. I did have a stem of Saturday, stem of Sunday, so let's go to the computer and I can show off what I did. So one of our oldest products that we have is our seven segment backpack. This is a board that takes a seven segment display and you know gives an iSquad C breakout to connect. I really love the chip that's used here, the HT16 K33. Unfortunately, went up in price before a while. It was really cheap. It was like a buck or so and it's really great because it's designed for driving matrix LEDs like seven segments or eight. It does have to 16x8 monochrome segments. It doesn't do PWM per LED, but it does do full dimming for the whole thing and for many people this is a great way to quickly add you know a seven segment display like this because these are old style photos. A seven segment display like this to their design over iSquad C. We've got code in Arduino. It's in Python. It's very easy to use and as we're going back in time we are also redesigning these boards to add STEMIQT plug and play connectivity. So this board is the one that we did this weekend. Actually we did this a while ago, but we finally got to test it. So what we try to do is actually you have it be the exact same sides and the same like pinout and shape and the holes in the same you know even though I would have done it differently if I was redesigning it. It's such an old board I didn't want to mess up people's existing designs or layouts if they used you know the same mechanical shape. I just wanted to add you know again a breakout to the bottom. So let's go to the overhead and I'll show. This board I actually did redesigns. This is what it looks like and I have the STEMIQT ports pointing out and I think that's fine and good because that way you can stack them edge to edge and you'd have a little cable going between them. So just you know doing a little blinking demo. You can see it's counting up very slowly and then to make it easy to test I also made it so I can remove the seven segment display here. I just socketed it. But so far so good and then I've also got there's a couple other boards that are similar. So this is the seven segment. There's also an alpha numeric you know hex segment starburst starburst style. If you go to the overhead it's the alpha numeric yes so this is the alpha numeric backpack. Okay you got a computer. This is the alpha numeric backpack so it's actually almost the same size as the seven segment and so I actually thought like this would be a good opportunity for me to not just set this up to be also STEMIQT but also maybe I can make the back be the same exact layout. So you know even though the display is different maybe that the panel would have the same layout for the SMT components and that way you could use the same SMT program and also the same stencil which is very handy. I like to share stencils between designs. They're not expensive but you know it's just like one less thing that you have to stock and deal with and that you know having it be the same layout is is also kind of nice. So this is for that dual you know two times two so quad alpha numeric display and then there's also the 8 by 16 mini which looks like let's see ht16 I think I have a breakout for maybe I didn't make a breakout for the uh maybe it's 16 by 8 oh yeah so there's the large 16 by 8 and then I think I did a mini version maybe I only did it for the feather wing I guess I only did it for the feather wing so maybe I would I would design that so I can make a a 16 by 8 and not just with the you know these large pixels this is kind of a chunky size one but maybe one with the smaller pixel display as well for people who want to because again it's almost the same you know size I kind of made feather wings of all all three and they all kind of ended up the same size so that'd be cool and so working on that you know it's an old design but redesigning it and then I also thought um I was doing a project over the weekend that I wanted to get some analog input and um I was like oh I wanted to get some audio input uh you know through analog not through pdm or through uh i2s and so I was like oh you know let me look at my um you know my I had some men's mic breakout and so I was actually uh using this in a project I realized that when I designed this I didn't add an amplifier to it and I was like oh I should really redesign it to an amplifier because it's it's only like a hundred millivolts peak to peak and that's a little bit annoying um so I thought I'd redesign it and then as I was redesigning it I was like you know I should really make it uh stemma friendly so you can plug it in with cables really easily that's you know one of the things that when we were doing um the you know brain uh craft machine learning project with the uh uh pie badge is that I want you know I didn't have an easy way to just like plug in a microphone um we had to kind of do this weird solder cable thing and so I was like oh I should redesign it to be uh stemmified so um I did that too so I have two versions uh this one is the max 4466 it's a um you know an electric mic version I do like electric mics um in some cases I think men's do a really good job but um I do feel like the an electric plus a max 4466 can give you really good wide range um audio input especially since men's mics tend to kind of tap out at um 10 kilohertz and these will give you a 20 kilohertz and then I um so that's a that's a stemma you know plug-and-play version of of the max 4466 and then I also did a breakout uh it's a simulans one simpler but for the spw 2 430 mems mic so again you know have a jst cable for quick plug-and-play and if I leave the jst off it's it's it's a breadboard friendly um got the um lmv 358 op amp here uh mems mic and a three volt regulator uh these mems mic that's another thing the mems mics really need three volts you have to have regulator in case you're powering them from five volts but then this you know gives me um you know 100 times game this is actually uh copy and pasted from the uh circuit playground design the original classic circuit playground that used an analog mic um which worked quite well you know I just didn't um when we got to the circuit playground express um I could use pdm and so it's it's much cheaper and easier to use pdm than analog but again you know analog is is when you need analog input you want analog input and um I noticed that you know it's it's rare to see a mems mic uh breakout like this it's a lot of people go with electric because it's cheaper but you know mems that there are some benefits to it so that's kind of what i'm designing are there any questions before we head on one of the questions we are working on a esp 32 s2 and a tft version of it you're still working on this yeah it's um just waiting for some parts to come in but yeah there's it's still in the design queue um we have some designs where um we know there's going to be some parts issues so we gotta wait yeah okay you want to get a great search yeah all right here we go let's go the great search for uh jubilee digikey and eight fruit every single week lady uses her power of engineering and more to show you how to find things on digikey lady what is a great search of the week this week okay this week uh so i was doing some analog mems mics projects and i wanted to make a breakout for um an amplified mems microphone i like mems mics because of course there's no hand soldering you can pick and place them um they're very small compared to electric mics and um you know you don't need to bias them the circuitry is is sometimes a little simpler because they just kind of give you analog output we also have done a lot of pdm mics and i2s mems mics um those are really nice because you know you get a little microphone and get your digital output but there are some times when you really want an analog output like a true analog waveform um and in that case yeah you need to go with with the mems design nothing's going to be is is uh for pick and placing um nothing's going to be as simple as just you know a simple tin can style mems microphone with a little amplifier um and there's no hand soldering which i'm trying to avoid in this design um so we do have a breakout that is unamplified for the spw 2430 at the time when this came out a couple years ago uh you want to go to the computer yeah uh when this came out um you know this is a nice little mems mic uh you know it's it's quite simple you give it power there's a three-volt regulator and then you get ac coupled or dc coupled output the only problem is yeah this is only 100 volts you know peak to peak so i want to read we do this design i've kind of meant to redo this in a while and i'm finally getting to it um but the bad news is that when i went to uh order these uh to just check in on them to make sure that they were available they are in stock uh but they're nrnd so not recommended for new designs which yeah there are 97 000 stocks it's not like i can't use this um and i think uh you know this is something that i'll be able to purchase for a bit but um you know i don't want to design it if i'm going to design a new design you know i'm going to see if there's anything else available uh so don't get stuck in two or three years having to do a respin i might as well you know like a mems mic is a mems mic i don't feel like there's any one that's particularly better than the other um so let's find an alternative to this that is available um so i definitely want to be a mems analog micro remember there's there's three types of microphones you can get in mems you can get itues pw pdm and analog and itues and pdm are more expensive in specialty um analog is is usually very inexpensive you see these are you know 50 cents or so um i don't actually care too much about you know the shape or anything there's different sizes and packages but they're all going to be about the same i don't really care about the signal noise ratios or something very simple um normally i would pick on the directional but there are it just that's not a specific thing and also the frequency range can change so i think i'm just going to look for any mems analog mics and then i'm going to look for only the active ones for this for this new design um so let's see there's a couple options looks like uh you know there's some that are in stock some that are not in stock a lot of that are bottom ported um i think i want a top port design a top port design looks like this where there's a hole at the top bottom port looks like this where that you have to have a hole in the pcb and audio goes at the bottom that's that's good when you want something flush but in this case i don't i don't think i really need that i kind of like this top i kind of like a top ported design um so let's select for port location top let's go to the top and then let's also go with the normally stocking and um so it looks like there's a lot of options here which is really nice again these are kind of generic there's you know this is sort of looks like a weatherproof version there's this kind there's this kind um looking at you know the ranges it looks like you know i can do 20 to 20 kilohertz that's kind of cool and they're all going to be three volts um but you know you're going to pay more for for fancier so let's let's sort by price and see what we get so there's a couple i think this is maybe a let's not look at marketplace okay okay uh avoiding the marketplace looks like ceo i devices has this one and then uh there's also this one this one looks kind of good to me because it's both inexpensive and um there's three hundred and seventy thousand stock which is always a nice look everything else there's about two thousand stock um i'd like it when there's a lot available this looks like a pretty standard one and what's also nice is it looks like the pad out on the bottom is actually kind of similar to the pad out here like it's got the four pads which is pretty cool so i can you know use this and i'll check the the dimensions but hopefully it'll it'll be about the same so let's uh let's open this up and then comparing it to this component so this one is a 3 by 0.1 by 2.5 millimeters this one is 3.7 by 3 millimeters it's a little bit wider and a little bit taller but i think i could probably have the pads fit either which would be kind of nice so i could start with maybe the parts i haven't stuck now and then adapt up to um this other the spu part and then um another thing that was kind of neat is there are um different if you don't do the top port requirement so let me get rid of the port location i still want to exclude marketplace um there are a couple of cool ones like i saw this one there was a 80 kilohertz microphone it's bottom ported but this is kind of cool because it can do um you know ultrasonic a high frequency noise so it could be good for um you know recording you know you could record high frequency noises that normally microphones are filtered out they're usually kind of window filtered from 20 to 20 hertz to 20 kilohertz um but if you want to make like a bat detector this microphone's pretty cool this is not what i'm going to use i might make a different breakout for this this bat detector but i thought it was neat that um there is there is a men's mic that can go up to 80 kilohertz so that's you know bats are getting a bad rep lately so um i mean maybe we got to start detecting bats more yeah it's like the new the new batman what else uh can use it besides to i don't know i think i think it said it was for like effects like if you like it was for detecting sounds because you and maybe far field it's kind of it was a little bit unclear exactly what it's for it could be military use or um you know high high frequency signaling you know there was the um the wi-fi chip from amazon that would use high frequency signaling to uh to set the wi-fi access point because you can you can send very high frequencies and this would be able to detect them stuff that you know even for humans we can't really hear very well at close to 20 kilohertz you know we can't especially as we age we start i'm not being able to hear uh over like 10 or 15 kilohertz um this can be interesting so this is not my the product i want to use but i thought it was an interesting part yeah that's kind of cool i could see us uh i mean you know we can't we'll get in trouble on twitter if we start like making stuff that uh angers the person so we just got to be careful with that but i i think just some good ideas there okay okay all right well that's the great search okay it's a great search and that is the show for tonight all right super super easy yeah we just got straight to the point yep thanks everybody for watching see everybody during the week norm week shows uh no Pedro hosting show until this week uh we'll be on ask an engineer we have jp's product pick we have jp's workshop scott's deep dive 3d hangouts all the things collins lab notes and more all week on the ate a fruit news network and thanks everybody bye everybody