Otto DIY github release V04

All codes have been tested properly with the respective Arduino libraries in this folder,
All pins are changed to the corresponding number in our wiring diagram.
New midi music like Mario and jungle to test the buzzer.
New great example codes to play with mblock.

Otto DIY github release V03

basic start and simple codes to become an Otto builder learn about robotics or make your own Otto, for advanced features like bluetooth and APP; please go to Otto DIY+ repository