Model rocketry telemetry is nothing new. Amateurs have been stuffing electronics in rockets since the beginning of the hobby. A programmable micro-controller coupled with a low-power radio, however, allows us to take the hobby to a whole new level. What makes this project notable is:
- Wireless data transmission allowing in-flight monitoring or post-flight data downloading without the need to physically access the on-board hardware.
- Constructed from easily available open source hardware and software, allowing anyone with modest soldering and programing skills to put together a configuration to acquire and record any data they desire. No custom PCBs, chip programmers, or toolchains to setup as in my last well received, but little followed Instructable (http://www.instructables.com/id/Buggy-A-Crafty-Programmable-LED-Creature/)!
Details, in brief:
A 50 gram, on-board micro-controller collects pressure and acceleration data and then transmits it on 915 mHz using a Hope RM12 module at a rate of about 50 reading per second. A separate micro-controller connected to a laptop via USB receives the data and transfers it to a serial port. A software program running on the same computer graphically displays the data as it is collected, and also saves it to disk for further analysis. Piece of cake, right?