基于AT89S52单片机的红外密码锁，实现红外的接收密码的校验和液晶的显示。通过它模拟I2C总线和AT24C02通讯,实现了掉电后密码保护功能和界面保护功能。该密码锁具有系统初始密码000000，用户可以自定义密码。开锁后，用户可对原始密码进行修改。当输入密码错误三次则会发出报警，然后被锁定。用户只能启用超级密码666666才能解除锁定。-Based on AT89S52 single chip microcomputer infrared trick lock, the realization of infrared receiving password checking and LCD display. Through its simulation I2C bus and AT24C02 communications, achieved after power off password protection function and interface protection function. The system initial password 000000 combination lock, the user can customize the password. After the lock, the user can modify the original password. When the input three times wrong password will be issued a warning, and then be locked. The user can only be unlocked enabled super password 666666