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Play music on software (or hardware!) synthesizers using the 8x4 button grid, and control pitch bend and mod wheel by tilting the Trellis M4
Spy themes are just cool. Code songs in MakeCode or CircuitPython so you can have one at the ready at all times!
Make a USB prank device using a Gemma M0 that will wiggle your victim's cursor every once and a while! Coded in MakeCode.
Ring in the New Year with a fun countdown clock that plays Auld Lang Syne! Doubles as a light-up party favor and noisemaker!
Build a working safe that uses the Circuit Playground Express as the dial to unlock a servo controlled safe!