I'd be interested in this. But like at least one other person has mentioned, I wouldn't need the telemetry. I just want something that'll help me find a lost rocket.
Finding a lost rocket was the initial goal of the whole thing, but if you're gonna put some electronics on the bird, might as well get some extras out of it, right? I'm packing what I can into a 14.5mm-wide board (I determined I can stack two 14.5mm boards at like... 1.5mm apart? Have the specs of the connector I picked somewhere) and still fit into an 3d-printed 18mm nose cone w/1.2mm walls, so that's my width limit). You'll be absolutely fine w/BT-50. Length is around 27mm at this point, but not yet fixed.
So, status updates for those who are interested. Haven't got any days with low enough wind to actually fly with my test unit, grr. And most of the week been working at the Real Job, but still, made a lot of progress. Established 2-way communications (sending commands to the rocket in addition to receiving a downlink). Started cleaning up code and trying to do a little documentation (I always wait til the end when I should be doing it as I go!). Good work going on the app (see attached). I love the look of that gauges library I found but I'm gonna need to do some work on it cause it's missing some stuff (like captions!). Established comms to send commands from the app to the rocket, so that's cool (right now it's just turning power to the GPS on and off -- the idea is that the rocket electronics will stay super-low power until put into 'flight mode' where it will turn up the GPS and start sending data quicker). I've got a 1000 mAh battery on my test setup... but I think I'm going to ship with a 80 or 50 mAh battery, so that kinda stuff is key. I'm shooting for 4 hours of 'low power' battery life, and maybe 30 minutes of "flight mode" battery life. The board will have an accelerometer so it'll be able to kick back to low power once it knows it's landed/sitting still, and then just keep saying "hi" every 10-15 seconds until you pick it up.
Think I may be settled on the ATSAMR34 processor, have a dev kit arriving (tomorrow, if the USPS website don't lie) so I can make the final decision. I haven't spun up a board in a couple years and, so I'm incredibly frustrated by the shortages of _everything_. Think I'm looking now more towards about $30-$35 for the base board and $25-$35 for the GPS daughterboard. Sucks, because I really wanted to be able to sell a base+GPS unit for <$50. But I'm picking parts (even down to stuff like USB connectors) based on what I can find that somebody actually _has_ a couple thousand of, and that means I'm picking some parts that are overpriced. There's so many parts that are active/"stocking" but 0-in-stock and "available: 2023".
Unless I'm missing something, it doesn't look like there's an option to do "polls"/"surveys" on this board. Think I might set something up off-board. Curious what people think/want about a few things (For example -- the board will have a USB connector for charging/programming. Should it be micro-USB or USB-C?)