@chunibuni Here you can find small tutorial: http://transistor-man.com/flying_nimbus.html Some theory: https://en.wikipedia.org/wiki/Inverted_pendulum Some more: http://ctms.engin.umich.edu/CTMS/index.php?example=InvertedPendulum&section=SystemModeling Motor is located in wheel. OW is using gyros and accelerometers and probably Kalman filters and PID controller. Have fun building your own version! :)

I hope FM is making some money at this. They had to develop and engineer the thing. We should be prepared to pay more than just the cost of parts and assembly labour. The trick for them is to make enough profit (or have enough working capital) to have an even better product ready when the knock-offs hit the market.