 The great search brought to you by digikey and a deferent. Thank you. Did you key every single way? Gladies are a power of engineering to help you find the things you need Lady to what are you looking for on digikey come this week? Okay? I'm actually doing a two fur because I have Two modules that I want to swap around that use the ESP 32 So one of them with went in a line. So let's go to that first Let's go to the computer and I'll talk about this module that so we use the ESP 32 for a bunch of things including this airlift Technique which Arduino came up with originally where you load firmware onto the ESP 32 And then it becomes an SPI client and then you can use that as a Wi-Fi chip set Really great when you have something like, you know, RP 2040 or an at mega chip something you want or you know In our 52 you want to add Wi-Fi as a co-processor You'd use something like this So the good news is that you know historically, you know, we've used The Plastic ESP room. It's this like kind of chunky but very serviceable module from expressive. It's very inexpensive. It uses the ESP 32 4 megabytes of flash no ps ram, but has a built-in antenna and it's like it's solid like it's it's like a beast All right, this isn't everything so we have the Shield and we have the feather wing on the feather wings a little bit of a tight fit You doesn't work and then for the issy-bitsy We use this you blocks module you blocks Nina, which are it just again also used by Arduino on there like nano connector nano Wi-Fi boards and what's nice is that it's extremely compact Okay, but you know what I'm about to say so the problem is is that this module I just kind of noticed like last week That it is under last time By this is the one I think I'm using yeah, so they still have a bunch in stock But it's last time by which means I can put in one last order, but they're no longer to be making this so You know, thanks for the warning and it is in stock Which is better again better than a lot of chips that we've we've dealt with in the last two years Where we get a last time by and they're like, but we don't know when we're gonna get them to you So, you know, I'm gonna pick up a couple just to kind of ease ease the transition but I have to refine a replacement for this and I wanted to fit on That it's a it's a bit C wing, which is very small and then likewise I've got the easy link. Oh, can we go to the overhead real fast? I'll show this again I've got this easy link board and when I put this together I used the ESP 32 Pico module, which is in ESP 32 with eight megabytes of flash Two megabytes of ps ram and it's extremely compact But it's a little bit more expensive and I'll show I'll show the pricing differences for all these So I basically want to find, you know, I'm like doing two things one I want to find what's the best module to replace That it's a bit C wing with the Nina W10 series that's end of line. So a very compact module Maybe it's this one and I also want to find a replacement for this module That maybe is a little bit less expensive because I don't need eight megabytes of flash in the ps ram So in second, I'm gonna just quickly open up something on my computer and then I'll switch over All right, I'll ask a question. Ask a question. Well the ESP 32 C3 support ESP SPI it doesn't yet Sorry, I'm good to start it on Bluetooth easy link Okay So now I'm going to open up both files so we can look at them Okay, so let's go back to the computer Top. Yeah, open up the T doc you Okay, so this is the ESP Easy link. So the one thing is is that I really want to keep the width of the board the same Because I'm trying to match the original Easy link, which was longer, but it had this nice width. I want to make it pin compatible because it's, you know, very easy to swap it out and again This module was Let's see if I can open the v2 This is the version using the original This is the original module using the CSR chipset T doc you So you can see it's extremely long but extremely skinny So it's like it, you know, it did kind of just keep going keep going going But it was many stories, but it's it's nice and compact So I did like that when I did this transition. This is a little bit squatter But it has that same footprint and then likewise Cheating I'm showing you head, but this is the itsy-bitsy wing and you can see how skinny that Nina W is I mean has to fit between these two I think You know point six, let's see. This is Five yeah, this is point six inches apart So it's you know the size of a of a large dip chip So, you know this one again don't need a lot of for neither of them We don't need a lot of ps ram or ram or flash Two or four megabytes is gonna be okay. We don't need ps ram. Of course I'm always interested in going with the lowest cost part available. I do want to build an antenna I don't necessarily need a UFL antenna option But like sure later if you know if that's available, but I basically like most people want to build an antenna and to do this I actually recommend Going with the ESP product selector. Now did you key has all the parts in stock? But the ESP product selector is just a little bit more Specialized again for those ESP modules and I found this is a good way to kind of see the lay of the land And then I go to you know, of course, you can't buy from as far as it directly you go to the distributor You go did you key? So let's let's start now Okay, so for What I want so I definitely want Wi-Fi I do not want Why won't Bluetooth classic for that one board which means I have to use For the easy link I have to use the ESP 32 Again for the itsy-bitsy. I don't need Bluetooth However, right now the airlift code only works on the classic ESP 32 So we're gonna use only the classic ESP 32 I can't use the 8266 no classic Ditto for the s2 c3 s3 and c2 So that reduces the list down to 72 pieces Next up system on a chip or module I want the module because I want it to be like the FCC stamped and everything tinned and ready to go I want to just place it. So I'm gonna go with a module Status, you know, I want mass production Core, I don't really care if it's single or dual core antenna. I do want it built-in. I want it to be PCB Antenna Ipex is the pluggable antenna Okay, so let's see what we've got here. I can't quite reduce that. This is unhideable That's okay Okay, so we've got all these modules Down here and the thing that's most important to me is size so I'm going to search by size and moving up and then you can see there's a couple options with ps ram and You know all them are gonna have some different flash different ps ram Nothing to notice. They all certainly have different GPIO availability So just keep in mind all the modules that are available for the ESP like each time you change package Like there's four pins that swap in and out. So just be aware like GPIO like 10 and 15 10 17 18 19 20 Those those numbers tend to kind of flip around Okay, so these are all in production and let's look at the sizes. So the Pico is definitely the smallest it's got a 13 millimeter by 16 millimeter size whereas the mini There's a Pico mini and there's the mini the Pico mini is 16 millimeters 17 millimeters tall The mini one is 19 millimeters tall. So for visualization I've actually started I started adding these here. So this is the U blocks which is actually the smallest by far you can see they they're they're really good at making extremely compact designs They put the pads on the bottom. They use like BGA parts. I don't know what the heck they did I've never incapped it, but it's extremely compact This is the Pico Which is again 17 millimeters tall and this is the mini note that they're not, you know, they're this is the same width But it's taller it actually has the same number of pins basically it's just like a little stretched out. So this one the chip inside the The chip that's in it ESP 32 Pico chip has the ps where I'm in flash all on one die I think the mini has Maybe the flash is separated or something. It's like it's a little separated and then this is the room which Definitely has the flash and then a spot for memory Separates this is kind of the end. This uses SOIC flash. So they get they tend to get less expensive as you get bigger Because you don't have to have as tight integration. But of course, they're they're bigger Although they all pretty much have the same RF performance within reason. So the the thing about this is You know, this is the itsy-bitsy wing turn off the bottom layer and The you know really nothing beats this U blocks nano I Could fit the Pico You know, it would be a tight fit but it would fit right there in the middle and Then this would fit too. It's the same width But I have to really start squishing all the parts back. Maybe you go with a double-sided design So this is a little bit tougher We'll look at the price differences for these So if I go To digikina look for ESP 32 and Then I want transceivers modems. I only want the active ones and I only want ones that are using The ESP 32 Chipset not the s2 not the s3 there are a couple different variations of the ESP 32 And I want it from a stress if I'm gonna use the expressive modules because again you blocks are discontinued and I want it to be a Module I want a tenet included Trace antenna. I don't want the I pecs or UFL Okay, so and then is there a way to get just the modules? I don't know if the modules are Well, this is module. Let's not really module I'm gonna stick with this So if you search by price if you sort by price The mini module is is kind of the least expensive It's about 250 in quantity and then there's a version that has the UFL antenna if you like There's the H4 version. This is the same but a little bit earlier. So it's it's not Recommended I believe it's kind of not end of line, but it's like solely being discontinued And then the room is actually a little bit more expensive. So it turns out it's actually cheaper for me to go with the mini module the Pico Is all the way down here is more expensive It's four dollars in quantity and it's more expensive because it's got that PS RAM in it and it's got double the flash all things being equal You're always gonna pay more from well you tend to pay more for more integration in this case Interesting, it's actually less expensive, but you're definitely gonna pay more for flash and PS RAM like those those cost 50 cents No matter what so it's not surprising that double it and you know your price basically goes up a dollar fifty per But the mini module is actually kind of like, you know, very affordable here. It's it's it's inexpensive It's 250 and there's a version with and without the antenna. So You know, I think if I can you know, it's it might actually be worth it for a dollar fifty to move From this you blocks to this module. That's two dollars fifty cents and maybe even go double-sided You know going double-sided is or like going to much smaller components is always a little bit of a risk, but If you can save a dollar fifty on your bill material costs and you know your process only ends up being a dollar more It might be worth it and then of course the We're room will like totally not fit. So, you know, I have that choice So when I when I do my sizing for modules, I like to pick out between them and then likewise For the easy link Let's see I can I Can show some sizing differences so ESP 32 and Then I have these all in my library all that the mini sizes So this is the Pico and then the mini which would just be a little taller It wouldn't make the size any wider and I'm okay with making the board a little taller as well and then one side note is In case you're curious the ESP 32 C3 mini is actually the same size as the ESP 32 Pico so if you would like to If it is possible you use the C3 Don't have it here. If you would like to use the C3 though in The product selector you can oh, no Sorry Yeah, in the product selector the Pico mini is 13 by 13 millimeters wide by 16 millimeters tall if we change chipsets to be the C three the C3 mini is Likewise 13 by 16 so so the words Pico and mini Just be aware. They don't always Mean exactly the same thing between chipsets that was surprising to me when I saw that the C3 mini is the same size as the ESP 32 Pico But again, I can't use the C3 at this time. So I'm going to go with the mini one and four There's lots in stock They're 250 a piece They'll do the job. Well, it's actually a little cheaper than the room module It's got a built-in antenna and it'll fit in both of the boards that I'm designing for That's a great search