I’ve modded an old electronic toy-safe, which is unlocked by typing the 4-char password.

RFID Modded Safe

I’ve unsoldered the locking-mechanism from the circuitboard, and connected it to the Arduino instead.

Locking-Mechanism Hack

Then I connected a ID-20 RFID Reader to the Arduino and programmed it to read the tag, and see if it was allowed to enter the safe.

ID-20 RFID Reader

If it was allowed, the Arduino will keep the safe unlocked in 3 seconds!

I’ve also made this video to show how it works:

www.youtube.com/watch?v=oxuD--7wWE8

You can grab the code here, and try it out:

#include <NewSoftSerial.h>

NewSoftSerial ID12(5,6);

//                RX,TX
// RFID reader ID-12 for Arduino

// Based on code by BARRAGAN

// and code from HC Gilje - http://hcgilje.wordpress.com/resources/rfid_id12_tagreader/

// Modified for Arudino by djmatic

// Modified for ID-12 and checksum by Martijn The - http://www.martijnthe.nl/

//

// Use the drawings from HC Gilje to wire up the ID-12.

// Remark: disconnect the rx serial wire to the ID-12 when uploading the sketch

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