单片机89S52单片机为主控芯片，外围加蜂鸣器控制电路、开门指示灯电路、电控锁控制电路及8位数码管显示电路等-Single chip 89S52 microcontroller as the main control chip, peripheral plus buzzer control circuit, open the door indicator light circuit, electric control lock control circuit and 8 bit digital