Adafruit ItsyBitsy RP2040

ItsyBitsy form factor with RP2040 horsepower — dual-core ARM, 8 MB flash, USB micro B, and 23 GPIO. Smaller than the Feather, perfect when board space matters.

Comes with a stage-mounted USB micro-B connector, four mounting holes, and a big square reset button. CircuitPython, Arduino, and MicroPython all run cleanly.