Under $200. Single 2S LiPo battery. Readily available parts. Programmable flight control via Python.
Experience the OSD335x performance for industrial applications & robotics by building this cool Rubik's Cube solver using BeagleBone Blue.
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!
Graphical Systems Design approach to controlling the Renaissance Robotics eduMIP with LabVIEW
BeagleBone Blue's DC motor drivers can be used to drive bipolar stepper motors too! Pair them up with a little code for open loop control.