A Teensy 3.6 is used to run the show, acting as a USB-MIDI interface so the toy can be controlled by music software like Abelton. It’s connected to the toy’s buttons through a multiplexer.

[TheSpodShed] decided to whip up a USB MIDI interface for the chip, with the help of the Arduino Pro Micro. The Arduino Pro Micro is a Sparkfun creation, using the ATmega32U4 microcontroller.

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MIDI is, in a word, a godsend. This unassuming data-transfer standard is the magic sauce that enables drastically different music technologies, developed decades apart, to tell each other what to ...