The design of electronic locks based on infrared remote - Control with MCU

At present, key-pad electronic lock with alarming funtion is to gradually replace the traditional mechanical locks, overcoming the shortcoming of the traditional mechanical locks which contain few password and lack of reliabilty, but keypad electronic lock makes a great progress in terms of technology and performance.This paper represents a type of remote-controlled electronic lock developed with the chip of AT89S51. This type of lock have two input devices, one of them is a 4*3 matrix keyboard mounted on the lock, the other one is a remote controller which also have 4*3 matix keyboard.we can use either of them to open the lock or change the password we have set. In the design, we adopt the infrared ray as the medium, because of the strong anti-interference ability, reliable transmission of information.