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Fits in your pocket, is fully Open Source, and can run CircuitPython, MakeCode Arcade or Arduino games you write yourself!
What's the size of a credit card and can run CircuitPython, MakeCode Arcade or Arduino? That's right, its the Adafruit PyBadge!
Using CircuitPython to turn the Circuit Playground Express into a USB MIDI controller or a simple MIDI-enabled synthesizer.
Just add a power outlet and a WiFi network and stream time and location stamped environmental readings to AdafruitIO.