The diagram is where you specify connections ... makes the pin show up on the Firmata component I wired two buttons connecting an Arduino’s pins 7 and 8 to ground, each with a 10K pull-up ...

All it does is time the activation of the relays that control the gas flow, power, and wire feeder, so [Brett] decided to use an Arduino instead. The welders control circuit runs at 24V ...

All products featured on WIRED are independently selected by our ... Using motion detectors and an Arduino you can trigger lights, fans, or even an pneumatically controlled cleaver-wielding ...