The use of Radio Frequency IDentification (RFID) technologies is growing. Many different applications are implemented in various sectors, and used for very different purposes. RFID enables wireless ...

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 ...

This code uses an Arduino board, an RFID reader (MFRC522), and several components (LEDs, a relay, and an input switch) to control access to a certain area or device. The code reads the unique ID of an ...

RELAY-POWER is just connecting positive line to RPOW terminal. Usually, if you power the lock from the ESP-RFID Relay Board, that pad will be connected and you will use RPOW terminal to hook the lock.