A team project (with @Albert Jiang as one of the teammates) built with BBC micro:bits in 2016 ARM Hackathon by Cambridge University Engineering Society.
It is a electronic instrument with automatic harmony, using 4 buzzers connected to 4 micro:bits boards with 1 "master" and other 3 "slaves". The player uses the "master" board with different orientation (using the compass built-in) as different octaves, different tilting (using the accelerometer built-in) as different pitches. Everytime the player touches the pin0, it play the current pitch with the name of the pitch displayed on the board, with automatic harmony produced by 3 "slaves" following pentatonic harmony.