Hi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot of things and here is where I ...

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 ...

You can read the state of a button using Arduino and a few lines of code ... pin if you want to and you can even add extra circuitry to turn ON an LED or use a relay to power up different equipments.