电子密码锁，利用单片机控制，密码设置为8为，当输入密码对时绿灯亮，输入错或输入位数不足8位是红灯亮-Electronic code lock, use MCU control, the password is set to 8 to, enter the password to the time when the green light, enter the wrong or less than the median 8-bit input is red light