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 ...

To set up and run this project, you will need the following hardware components: Arduino or compatible microcontroller board. NPN transistor (e.g., 2N2222, BC547, etc.). Diode (e.g., 1N4001) for ...