here i am sending you some of | Microcontroller › 8051 › electronic door lock system › here i am sending you some of March 28, 2011 at 4:46 am #5821 dagakshayParticipant here i am sending you some of links which might help you out: http://www.engineersgarage.com/microcontroller/8051projects/electronic-code-lock-with-password-using-at89c51-circuit http://www.engineersgarage.com/microcontroller/8051projects/keypad-simple-electronic-lock-AT89C51-circuit