Besides the three cameras, we had two tracking devices with altimeters. One was built using a Rockblock satelite transmitter, and the other with a SIM808 gprs module. Both used arduino for the main processor.
I also built a 3.7v heating system to keep our battery packs from freezing.
The goal here was pure photography and to keep it as light as possible for the fastest ascent so we had the maximum amount of alititude gain during the eclipse. That would also minimize our time in the -60 zone and radiation exposure and maximize our chance of recovery.
We plan to do more launches soon (I still have 3 1000g kaymonts left!) and send up some "real science."
I think we're going to stick with Arduino too wherever possible. As much as I love Raspberry pi, there is too much that can go wrong when you have to have a linux kernel running just to be operational. Straight C code compiled to machine code is the way to go for us - old school space program
We tested with a radiation source too to see if our gear would hold up. We got it up to over 2000 cpm on the geiger counter and it was still functioning fine w/o any kind of shielding.
Oh and everything was powered off of stock 18650 batteries. A four pack in parallel for the satellite tracker, a two pack for GPRS. I had some fancier LiFePO and similar, but ended up going with the 18650s because they have the best surface area to volume ratio for heat loss, at least from the batteries we had.
the decision to put on the waterproof housing was last minute. We thought it would royally suck if we went to all this trouble only to fail for lack of a housing.
Thus when our structural engineer went to work to widen the mountpoint for the camera, it didn't occur to any of us that the viewport might need to be widened out too!
I think it's more fun and whimsical like that - it gives you a perspective like you're looking out of a window in a space ship or something.
The good news is, camera 2, without the housing, ALSO got the entire eclipse on file with a completely unobstructed view and was recovered. I will be uploading and posting that footage soon as well.
Thanks for the feedback - we're so excited to be part of the community!
PS: If anyone else around the Seattle area would like to collaberate, coordinate, or just grab a coffee/beer and say hi, please drop me a line.