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 ...
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.
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