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serial_switch
- 通过串口发送命令，控制IO口变低，2秒后，IO口电平变高，2秒是通过定时器控制的，时间比较精确(The command is sent through the serial port to control the lower IO port. After 2 seconds, the level of the IO port becomes higher, and the 2 second is controlled by the timer, and the time is more accu