How to detect the absence of an RFID tag
In this video, i am using rc522 module with arduino to detect tag revomal. Lock/lights will only actuate on detection of valid rfid tag. Detect card removal
https://arduino.stackexchange.com/questions/8736/how-to-detect-the-absence-of-an-rfid-tag
From: Satyam singh
Related topics : rfid tag detection / rfid tag uses