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A Raspberry Pi Pico runs the show, using TMC2209 drivers to command a pair of NEMA17 stepper motors to drag a magnet around beneath the sand.
That includes the newest player to the microcontroller game — the Raspberry Pi Pico, which [pete_codes] used to whip up a nice looking OBS stream deck.
Raspberry Pi releases the Pi Pico and is partnering with Arduino and Adafruit to expand the ecosystem around Raspberry Pi's own silicon.