The Casio SK-1 keyboard is ... he can still use the Arduino to reprogram the NVRAM chip when he wants to play around with the sound. We’ve covered some pretty fancy circuit bent instruments ...

as well as send messages between Circuit Playground Expresses. Can also act as a proximity sensor. – 8 x alligator-clip friendly input/output pins – Includes I2C, UART, 8 pins that can do ...