An example of a simple way to command one (or several) Arduino relay(s) via a HTML & PHP web page. I did this for my student project. Please, note that the way to command the Arduino board over serial ...

Control relays using simple serial commands. Contribute to M0LTE/arduino-relay-control development by creating an account on GitHub.

An RC circuit in series with the coil allows full-current turn-on for reliable relay operation, then reduces the current to save power. Fellow engineer Sanjay R. Chendvankar of Mumbai, India ...