Raspberry Pi - Serial Port Method

Experimental preparation

1. Raspberry Pi motherboard

2. 8-channel line patrol module

3. Several Dupont cables

The Raspberry Pi board needs to download the serial communication source code provided in the document, and the Raspberry Pi system needs to open the serial communication interface through raspi-config

Experimental purpose

The content of this experiment is mainly to use the Raspberry Pi main control to receive the data of the 8-channel line patrol module through the serial port.

Experimental wiring

As shown in the figure:

Open the Raspberry Pi hard serial port (Raspberry Pi 5 does not require this step)

• Configure the Raspberry Pi serial port first, because the Raspberry Pi's hard serial port is used for Bluetooth, and the mini serial port is unstable. This experiment uses the hard serial port. Raspberry Pi pin diagram

• 

1. First perform the following operations to map the serial port Enter sudo raspi-config in the terminal

2. 

3. 

4. 

5. 

6. Set the hardware serial port to GPIO serial port, edit /boot/config.txt with root privileges.

The command is:

sudo nano /boot/config.txt

After opening the file, add two lines at the end

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dtoverlay=miniuart-bt 
force_turbo=1

Save: Ctrl+O, exit: Ctrl+X.

7. Save and exit, then restart the Raspberry Pi and you can see that the serial ports have been swapped. Reference Links: https://blog.iyatt.com/?p=1817

Experimental steps and phenomena

1. After connecting the wires, run the script

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python3 UASRT.py

Experimental source code

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#Main function
if __name__ == "__main__":
    print("start it")
    
    try:
        while True:
            usart_deal()
    except KeyboardInterrupt:
        pass
    finally:
        ser.write(bytes("$0,0,0#",'utf-8'))

This source code only writes numerical data. If you need to parse analog data, you can refer to STM32 serial port parsing