In 2015, I was selected to work with five other students to build a high powered rocket with a telemetry payload. We all also worked to achieve our high powered rocketry level one certification with NAR. We worked together to build a payload for a Public Missiles Callisto named Rocktopus, in keeping with the prior year's theme of Cthulu and Squid:

You can view the image of the crude block diagram of the payload at http://imgur.com/a/LdhOz or click here.

The code used is on my github account:

https://github.com/rehuffman/TeensyLaunchPayload

Our first launch was a bit of a bust.  We managed to get some spotty telemetry from the xBee radio, but the xBee shield created a stray current that fried the SD card shield. We ended up swapping to a Teensy 3.2 from a 3.1 in order to get more current capacity to run the xBee. If we did it over, we would use the 3.5 or 3.6 with the built in SD card.  

We ended up dead-bugging a new SD shield for the second launch, which we were never able to actually complete in the proven Rocktopus. The class that we were traveling with borrowed the unit for their maiden launch of the Intruder they built, which subsequently exploded. It blew the fins off, zippered and lawn darted the payload into several pieces. 

So it goes with rocketry...

We did get some interesting data from the explosion, showing the general lack of stability. 

On the bright side, we all got our level one certifications that day!

Prince died the day before our launch, so I named my certification flight rocket Purple Rain in his honor. Man, 2016 was a rough year for legends.

Nick Greenwood had much more success with his unit that had a GoPro Session unit attached to it. We got some great video from it, and he has been kind enough to share the 3D printer file for it.