Introduction - If you have any usage issues, please Google them yourself
Serial communication experiment, set the baud rate to 9600 or 19200. Power outages in the computer case, the board received the serial interface lines of the RS232 interface on the computer, the computer through the RS232 interface to send data to the experimental board, board should be able to correctly receive the data, and will receive the data shows the experimental board digital tube When pressing the button board, will receive the data sent to the computer correctly.