These self-balancing hoverboards can be bought for less then 200€ / $ by now. They should provide an inexpensive and versatile basis for all kinds of robot- or skateboard-projects ( i.e. a full.size self-balancing bot! ).
The control consists of a central motor-controller plus two gyro-boards ( can be bought separately - check out ebay ).
It would be a great job and help to analyse and describe the protocol between the boards - I simply don't have the tools...
Any help appreciated!!