主要作用是利用按键或蓝牙发送命令到单片机后，32单片机通过输出高低电平

The main function is to send commands to the single-chip microcomputer through the button or Bluetooth, the 32 single-chip microcomputer controls the relay by outputting high and low level signals, and finally uses the relay to control whether the electromagnetic lock circuit is turned on or not.

The main role is to use the key or Bluetooth to send commands to the microcontroller, 32 microcontrollerthrough through the output of high and low level signal control relay, and finally use whether the relay is turned on to control the electromagnetic lock circuit on or not.

The main function is to use the key or Bluetooth to send the command to the single-chip microcomputer, 32 single-chip microcomputer controls the relay by outputting the high and low level signals, and finally controls whether the circuit of the electromagnetic lock is on or not by using whether the relay is connected.