The Arduino Relay Shield allows your Arduino driving high power loads. The Arduino Relay Shield allows your Arduino driving high power loads. The Shield features three relays, each relay provides 2 ...

The WiFi Relay Shield is an Arduino compatible module that provides an easy way to control high voltage loads thanks to 4 independent channels equipped with photo-coupled mechanical relays ...

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 system. The relay can be used ...