ABSTRACT： In the daily life and the work, the way to the house’s and department’s safe guard, unit’s document file,the financial reporting as well as some individual material preservation almost need many locks. In the safety work guard domain, the electronic combination lock have the highly security, the lowly cost, the lowly power wastage, easy to operate and so on merits.
This article is based on the economical and practical point of view and combined with the remote control technology, uses the United States Atmel Corporation AT89C52 microcontroller as a master chip and the data memory unit, it combines with the wireless remote control keyboard input, external matrix keyboard input, LED display, alarm, unlock and so on circuits, dominates by the C programming language chip E^PROM AT24C02 of the control procedures, the password can be changed many times, the electronic password control also has the alarming function. Hereinto, Remote controller is the important combination among this parts. It is comprised of F05C device combined with PT2262 coding device. while, there have a receiving module, uses J04E and PT2272 chip. This module receive the remote signal and decode it.
This password lock circuit design has intelligent control lock, unlock, alarm and change the password multiple functions. Password length can be changed, great security and high flexible than others, it is widely used.
Key Words: Password lock ， MCU， Alarm， LED Display
