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RFID Door Lock Shield Quickstart Guide | Freetronics
The RFID Door Lock Shield allows easy connection of an external RFID reader module and an electric door strike to an Arduino.
Power LED. Indicates that 5V is present on the Arduino.
Manual strike release connection. Shorting these pads causes the output to be activated. Useful for an "exit" button to unlock a door from the inside.
Status LED connection. 5V, GND, and one digital output that can be...
Make a long-range RFID card reader with Arduino | Freetronics