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 ... then decide which ...

A few months back, [John] was reading an article about a simple RFID security system kit ... with an ATmega328 armed with an Arduino bootloader. His system replicates all of the original kit ...

[Jason] really wanted to build an RFID ... system. Whenever a valid key is swiped, the Arduino triggers a relay which can then be used to control just about anything. In this case, [Jason] plans ...

Real Time Home Security System using GSM Technology-An Anti-theft System ... The circuit is highly-flexible so that you can use any SIM900A modem (and ofcourse any Arduino Uno board) of your choice.