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 ...

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security ... but add the comma after ...

Arduino's array of inputs and outputs proves crucial ... screw shield and then connecting the screw shield, Crowduino, and relay shield together. After that, things got a bit dicey.

Of course he could modify a refrigerator and humidifier to be controlled separately, but [Mike] decided the best course of action would be to control line voltage with an Arduino. [Mike] started ...

Arduino Relay Basics - How It Works and How to Use It Posted: June 3, 2025 | Last updated: June 3, 2025 Hi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot ...