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 ...

At points I might do something that might be dangerous because I'm comfortable with some tools or techniques but please always use your common sense and don't try everything you see here.

In this project, we are going to build something very simple project, a temperature controlled relay that is used to turn on a dc fan. You can actually change the DC Fan to other electrical devices ...

Cook At this point, your Arduino has the ability to sense ... You can just leave the power relay on top of the enclosure, ready to use with your fan or whatever appliance you’re looking to ...

I used a separate Arduino board to provide sound to light ... shield and then connecting the screw shield, Crowduino, and relay shield together. After that, things got a bit dicey.