根据设定好的密码，采用二个按键实现密码的输入功能，当密码输入正确之后，锁就打开，如果输入的三次的密码不正确，就锁定按键3秒钟，同时发现报警声-According to the preset passwords, using the two keys to achieve the code input function, when enter the correct password, the lock will open, if the input is incorrect password three times, on the lock button 3 seconds, also found the sound alarm