Inside is Arduino Pro Micro and a PMW 3389 optical sensor on a breakout board. [Ben] was going to use flexible 3D printed panels as mouse buttons, but then had an epiphany — why not use keyboard ...

This paper uses a simple two-wheel self-balancing car as the design platform., the gesture sensing system with MPU6050 serves as the main sensor. The data of two sensors are filtered and fused by ...