The Relay Shield provides a solution for controlling high current devices that cannot be controlled by the Arduino’s Digital I/O pins due to their current and voltage limits. The Relay Shield features ...

This schematic is reverse engineered from the MOVI Arduino Shield without the assistance of X-ray or destructive tear-down. It is likely incomplete and inaccurate. There is no PCB layout included.

In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...