Take the eduMIP and hook it up with the DSTR app in order to control the Mobile Inverted Pendulum from your very own cell phone!
Under $200. Single 2S LiPo battery. Readily available parts. Programmable flight control via Python.
A smart thermal camera using FLIR Lepton3 on BeagleBone Blue board. The project won the "FLIR Lepton3/BeagleBone Blue challenge" in 2017.