An optional RELAY driver output is available at pin 4 of the Arduino board. If you wish to add an electromagnetic relay to switch off/switch on any external electric load, just use this output to ...

Raspberry Pi programmable timer “To make things more interesting, you can modify the provided source code, and re-program the Ninja Counter itself using an external Arduino Uno! It includes a ...

When notes stuck to the water heater failed [Ryan] decided to whip up “the world’s most expensive 240V relay” using a servo, a real time clock and of course an Arduino. All in an … ...