 Every single week on desktop lady and we do the great search with digikey and a fruit lady It uses her engineering skills to show you how to find how to find all the things on the digikey Website, we call it the great search now I have a little video that I want to show later about stemma stemma qt But why don't you kick this off? Yes, so I thought people probably wanting to make their own stemma qt boards. These are boards that have these little connectors on the end Or maybe you want to connect to our larger stemma series which uses the stemma ph pens and I thought let's go to the overhead real fast and I'll show what these look like So So on something like this board you'll see I have these kind of large JST ph connectors and like you know if I have an led strip For example, I want something with high current Something with a big connector that can handle these thick wires JST ph is great. This is a two millimeter pitch connector. It's very common You'll also see it in batteries spark front originally started getting lipoly batteries with JST Ph connectors two millimeter pitch connectors and so they kind of became the maker standard And so I started using that exact same pinout and then other boards like the micro bit uses that same connector So you can like start to cross connect all these batteries and it's become sort of a maker standard So if you want to maintain that standard And have your stuff work within this community or you want to prototype with these maker parts and then make your final product These are really good quality connectors. They're really great value And they're really reliable one thing I'll watch out for I'll tell you to watch out for is I've seen folks use non genuine JST connectors and they catch they are they don't have this like really smooth click and click out So these are you know, they're firm you have to like exert a little bit of pressure to remove them But they don't stick like they they don't end up yanking the wires out of the housings And I've seen that if you don't get genuine JST. So, you know, just watch out for that Some of them are compatible, but they're not quite compatible So these are the larger two millimeter pitch and then for The stomach qt boards. We use One millimeter pitch again, this is another standard spark fun came up with They're really good at you know being the innovators in this market And they said let's make breakout boards that just plug and play and chain over iSquared C Um iSquared C has become basically the standard for sensors. We rarely see spi only sensors anymore Um iSquared C you can clock it at 400 kilohertz or up to a megahertz And uh, it's it's, you know, well supported by pretty much every platform on earth So having just power Ground clock and data over iSquared C works wonderfully for many chips like this, uh, bmp390 barometric pressure sensor Um, and again, it's these they fit snugly They don't come out easily but they do with a little bit of a yank, which I really like These are non-latching connectors as long as you're cool with non-latching connectors then Then I think jstsh and ph are wonderful So the difference sh one millimeter pitch ph Two millimeter pitch. Okay, there's other pitches too, but these are What you'll see a lot of um, they you know, why not just go for 0.1 inch pitch There are there are you know xh series and other series Pins that are 0.1 inch, but they they start to get very large right once you start getting passed like Through your four pins. You're like wow like this connector is getting really chunky And if you're not carrying that many amps of current, um, these are much more compact Which will mean that your your board doesn't start getting overwhelmed like if I had a connector This size on a breakout you see would start to take up, you know Half the body of the breakout would be the connector and it wouldn't be as uh, slim And svelte as these wonderful jstsh's so let's show off Um, finding some jstsh connectors. Let's go back to the computer Don't forget if you want esp 32 s2 minis. They're in stock right now Okay, so um, remember there's two kinds. Let's first go to the jst ph um, and there's data sheets, of course available for these um When you search for a connector like jst ph, you know, you're gonna get a couple You're gonna get a lot of connectors and cables and like pre-assemble things So again, don't forget to go here and then you can look at the photos to see if that's what you want. Yes And these come the ph has come in like, you know, 15 position four position um Men, you know all the positions you want and they come in Uh, this is called the right angle and this is called the vertical, right? This sticks up off of the board you plug facing down Um, they are keyed which I really like. I think When I was younger, I used non-keyed connectors I thought as a child I spake as a child and I soldered as a child But now I use keyed connectors and I no longer Flip from my cables around There If you see the obsolete that's probably because it's non-row house versions So you'll probably want row house versions And then, you know, I use the two three and four pin the most And um, these also come in through hole the ph is coming through hole because they're large enough And so if you're using, um, a process where you need a high mechanical strength These, you know, these are Quite strong and they're inexpensive. You could pop them in easily and wave solder them Um, for the surface mount versions, you'll notice that there's those big tabs on the side If you solder them down flat onto your ground plane, you'll have pretty good mechanical stability Not as good as through hole, but still quite good. So, um Yeah, use these, uh, they're I like that they're available and you know, like every size This is the through hole right angles and there's a through hole straight version three pin four pin all that good stuff and, um, you know, we use these again for You know, anything that has to pass like an amp or two of current, uh, you can also get the matching connector Let's see if they Link the matching connector. Oh, they do have jumpers. This is kind of handy So if you want to just buy cables directly, uh, they're linked from the bottom. So it's a jumper cable from jst Um, there's the mating products. So, uh, various Types of housings that you can use and then you can get the pins to make housings or Honestly, just get the jumper cable and then, you know, you're you're good to go You can always cut the jumper cable if you want to solder it to some other device or connector. All right Uh, next up, let's look at jst sh Again, you want to go into the, uh Pin connector in this case, we're going to go for the four pin because we want to have it work with our stomach qt boards And we want active um Click okay, and we'll see. Yeah, there's pretty much you can get, um Vertical there's two vertical versions here, and I don't quite Know the difference These look good to be identical Tbt. Oh, you know what probably one is in a um tape and wheel and one is uh is cut tape or something um, so this one, uh is vertical so it again it points up and um, it's a little tough to see But maybe I'll show on the 360 Give it a moment to load. This is handy when you want to like make sure that the connector is Exactly right okay, so You can see that there are these Um solder tabs. So these are like, you know, melted into the body So you'll just have to have a solder Two big solder pads to keep these from from pulling because especially since you're going to be pulling up on the connector Um to make sure that your uh footprint has those Um, it's in the datasheet And you can also download uh CAD models, which I've been starting to use by the way Uh, I used to make all my models by hand my CAD models now. I actually download You know one of these whatever suggested and then I might tweak it to kind of fit The way I want it to look but the footprint especially I really like Having the footprint made for me and then I can attach that to a schematics symbol I already like okay one quick question um Let me find that uh, do they have jst connectors that you can clamp onto a ribbon cable to make your own custom cables? That's a good question. I think that you're not going to find something Like that like, you know, you it's not going to find an idc connector for um this size Sometimes let's look back to the ph This one I think that this might be a crimp connector. You might be able to poke a wire into it Um, that's the best thing you're going to be able to do because it looks like you can either Yeah, you see how there's a little there's no 3d model, but see how there's a little uh you here I think you you can use a tool like a punchdown tool and you could You could poke wires in and then as long as it's the right gauge check the datasheet for the gauge It'll it'll grab on to the wire and cut through the um wire sheathing And it won't be a very strong cable. I wouldn't use it for like long-term use But it probably would be good enough for you know, very basic work Or if it's enclosed and protected like you know, if you yank on it, uh, you could yank it loose But for something that's protected and not being yanked. I think it's fine Okay This is as close as you're gonna get to idca to be honest Okay, so sorry we were at jstsh 4 pin So if you are um making uh a stem at qt board, is it pretty much the part you want? Um, I think it's a really good thing At the 360 if you want it um the photo so this is the basically the connector we use on all of our boards and You know, it's in in quantity. It's going to be about like 20 cents or so we can get them in real But they're really reliable Pretty much add them on like now tens of thousands maybe a hundred thousand different boards and uh, you know no failures almost no Pick in place failures either. Um, and you know, they they have many cycles of use So no so far. Nobody's like worn out this connector. So I really like it Um, jst, they make really good connectors. Check out the jst website Also, if you want to see other cables and connectors that they make so you can mix and match with You know your existing design depending on how much curtain you need and the gauge of the wires you're trying to connect to That's the great search That's a great search with zutiki, but we're going to have one little extra segment We have a special video all about stemma that we just did so i'm going to play this and then we're going to Do you like this connector? Here's more about it What is stemma qt? Stemma is an easy way to connect sensors and devices with no breadboards or hand wiring needed A controller board can plug into a bunch of devices for fast building and prototyping Stemma qt is the smallest stemma connector used exclusively for i2c communication You get two power wires and two data wires i2c shares the data wires so you can chain together multiple boards Stemma qt is compatible with spark fun quick and seed grove devices using a jst ph2 sh adapter So you can use all the hardware you already own Stemma qt is built into eta fruit glue mag tag qt pie and more You can get building without any soldering at all stemma qt is built into tons of eta fruit sensors and devices Just look for the stemma qt logo on the back of the board And with that is a great search