The almost-a-rainbow’s-worth of LEDs are mounted on circular PCB, which is mounted to a stepper motor through a gear train. This allows the instrument to scan through all six colors, shining ...

grbl is stepper motor controller ... for the normal drivers included on grbl Arduino shields (or integrated Arduino+drivers equivalents), and so I have been considering designing my own to link to ...

The system is controlled by an Arduino Mega, with the meters driven using ... was for a meter created using an automotive gauge stepper motor. I didn’t include source code either – but only ...