I build a couple of DIY electronic devices from open source projects.
I thought those could be useful to someone here on DIYDrones and they deserve a little visibility here too.
They are based on Arduino Nano and very cheap to build.
In this video I'm using both for the first time, with my work horse: the UavDevBoard3 equipped FunCub.
One is a variometer, developed and programmed by Kapteinkuk:
One is a drift free headtracker developed and programmed by Dennis Frie:
Many thanks to Kapteinkuk and Dennis Frie for developing sharing their work.