 The great search brought to you by digikey and Anna fruit. Thank you digikey This is a time of the week when lady to the user part of engineering help you Yes, you find the things that you were looking for on digikey.com lady to what are you looking for this week? Okay, so on the new rosary pie five, which I just got today. There are these cool new extra connectors Can you go to the overhead will fast enough to point them out? So this connector here is the one I'm most interested in it's called you are So traditionally if you wanted to connect to the you are the debug port of a rosary pie You'd kick to like these two pins up here like power power ground RX and TX and you'd use something like this This USB Console cable and you would plug this, you know into the GPIO and then you could get to the console Which is really helpful if you're running like a headless setup. You don't know the SSH Maybe it's not in the network. You want to just like have root access immediately So the good news is now that there is this new RP one chip. I'm I'm assuming I'm still experimenting I just got this like working yesterday that this is a separate Connection to the hardware you are for console Then the pins over here, which would be connected to the hardware serial port and the hardware serial port is how you'd connect stuff like GPSes and before you could only have one or the other you either have a console or you can have a GPS You couldn't have both but now I'm pretty sure you can have both because the you are it is on a separate connector So I would like to make a little adapter cable that takes this from the old style pie into This but this has actually not been The documentation for this connector hasn't been released that I could find so I thought I'd show how you could determine What the connector is now I kind of know what it is because I just use these connectors all the time But what if you don't know what if you're like I have never seen this before a really good skill on how to reverse engineering determine What connected is so first I'm going to turn off the pie So yeah, I love that on off button and I'm you only use it like 10 times already. I'm like this is my number one fan I mean, this is the fan connector over here. So that's the number one fan, but this number two fan Okay, so unplug this So let's get in here and let's zoom Okay, so what we're looking at here is a three pin connector. It's vertical and It's definitely not point one inch spacing But we don't know what the spacing is and it's I got this tan connector and you see there's these little Nubs on the side So we want to we want to find the cable that connects to it But the easiest way to get the cable is actually to first find out the connector is because it's like way Easier to identify connectors by image than cables especially because like there's often the shadowing isn't very clear Whereas here it's like you can see the outline very nicely. So the first thing you want to do is find out the connector pitch So what I do is first off Most connectors are in millimeter pitch not always big ones aren't but small ones tend to be in millimeter So what we want to do is we want to measure between the centers of the two They of the two farthest pins now you're probably wondering why don't I want to measure from like two pins Close to each other. The reason is it's really hard to like you're like, oh, is it like 91 or is it like 1.25? The difference in pitches can be like really small and you want to average that An in clarity over a larger number because if you're like having difficulty getting to the center of the two pins At least you have a bunch of pins to divide by so Okay, so if you have error, you know the error divides out so let's see let's let's try to get I don't know. No, this is this is definitely gonna be easy. So I want to get kind of in the center of the two And I'm gonna do this by looking above She turns out you can't look at a screen while measuring connector pitch Okay, that's pretty close. Okay, so I got one point nine one and you know just so you know like Connector pitches aren't gonna, you know, they can be like point nine five, but they're pretty much never it's always on the quarter Millimeter, so it's like one millimeter one point two five one point five two millimeters stuff like that So probably I'm just my hands aren't as steady. It's two millimeters between two pins. So it's one millimeter pitch So let's go to Digi-key site so you can go back to the computer and let's look for Connector I know you're like that's kind of vague but We can then look at images to see which one is the closest so we want something that's Closest to this it's it's pins and so rectangular connector So let's scroll down look at some images. Yeah, I mean like this isn't the connector But like that's the that's the idea we've got something like this, right? But we want a surface mount version. So let's start paring it down So first up we want active and It has one row with three pins And that should cut down like a ton and the mating So I should do you know, I usually do the number of rows First like the number pans the number of rows first because then I can see like what pitch is available And like I said, if you know, I had measured one point eight millimeters between the two pans and Point nine was available. I'd be like, well, maybe that's a possibility point. Oh three five inches But given that the only options I've got are either point eight one or one point two or one point two five It's it's definitely gonna be one millimeter pitch. So, you know, it's just very calipers. It's really hard to get Perfect, you're gonna be a plus or minus like ten percent. So just be flexible. Don't be like oh has to be exact Okay, and then All right, so that already pared down a lot. I think it went from yeah from 500,000 results to 85 So that's great Okay, and then I want surface mount and You know Upward right angle is actually across the board and Not right angle is pointing straight up So that's good. Let's do that apply and then Let's search for, you know, normally stocking get get rid of some of the the weird connectors and Then shrouding that's it. That's another thing. So, you know, some connectors I think there's a lot here like this is unshrouded. There's no There's nothing going around it and there's also sometimes connectors that have only like partial shrouding But we have a shrouded connector. So we might as well Select that Okay So apply All right, great. So it's only like 20 options now So now we can actually look and see which one is the most similar. So let's Let's actually look Sorry, can you go back to the computer over here real fast so we can just take a look at this connector All right, so it's a tan connector and it's got these little ears and it's got like these, you know, three contacts And there's these like kind of metal bits here So you don't have 20 options, it's actually not that bad. Can you go back to the computer? So There's a couple good-looking ones. So this one Let's take a look at this one. I like the 360 So this one It's close But it doesn't have the metal metal bits on the side Like the other one does so that's not it and Let's look at this one from Molex Let's look at the data sheet because there's only a one image this one Looks like it has a little notch Which this connector doesn't have a notch Looks pretty similar. It also doesn't have the little ears And also it looks way taller than that this contact this this this actually let's measure the depth It's not a bad idea. I should have done that to start the depth is four millimeters So sorry the height of it should been four millimeters if this is This is not this is five point one five point four. So since this is not right either I don't know if they have the height and oh insulation height. They do so let me actually Let me pare down by the insulation height So like for maybe I'm off, but it's about four millimeters Let's see how that does Okay, so what we've got left You know, this doesn't look too bad Te Very similar, but this one is definitely the closest match So it's up to the 360 Okay Okay, so you can see it's got those ears And it's got the metal on the side. It's even got the little dots. So this is it. This is the connector. Yeah, okay We found it. So it's this the BM-03 V SRSS. So now we know the connector So now if you want to match with the cable Oftentimes at the bottom here you can see associated products and these are items that go with or mate with This connector sometimes they even have there's a lot of information here, but Yeah mating sometimes they have like, you know mating contacts Yeah, here you go mating products. So this is like if you want to build your own cables This is like the matching connector, but there are cables available. So let's Let's check this out So yeah, so this cable you can get this cable cut in half and they can splice it on to The cable I've got here to make a York cable for the Raspberry Pi and there it's also available. This is a new thing alternate length It's kind of neat. So if you don't have you know if happened They didn't have in stock the 12 inch or if I don't want the 12 inch I can get the 4 inch version Which yeah, you can see the little ear sticking out here And they've got 999 in stock So this is my pick for the great search to connect to the UR port on your Raspberry Pi 5