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This is a 2-Channel RS485 module for Raspberry Pi Pico, SP3485 transceiver, UART To RS485
When connecting PICO, please pay attention not to connect in the opposite direction. The direction can be judged by observing the USB screen printing end of the module and the USB interface end of the Pico (also can be judged by the pin label of the platoon master on the module and the pin label of the Pico).
You can also wire it according to the table below
RS485 | Pico | Description |
VCC | VSYS | Power input |
GND | GND | Ground |
TX_CH0 | GP0 | UART transmit pin |
RX_CH0 | GP1 | UART receive pin |
TX_CH1 | GP4 | UART transmit pin |
RX_CH1 | GP5 | UART receive pin |
The connection of the RS485 board is same as the Pico-2CH-RS232
To setup the Pico for working, please refer to the official guide: https://www.raspberrypi.org/documentation/rp2040/getting-started/
Open a terminal and run the follow command
sudo apt-get install p7zip-full cd ~ sudo wget https://www.waveshare.com/w/upload/9/94/Pico_2CH_RS485.7z 7z x Pico_2CH_RS485.7z -o./Pico_2CH_RS485 cd ~/Pico_2CH_RS485 cd c/build/
cd ~/Pico_2CH_RS485/c/
Create the build folder and add SDK path to it:
By default, the ../../pico-sdk is the path of SDK
We have created the build folder in examples, you can just enter it.
Note: If the actual path of your Pi is different, you need to write the correct path.
cd build export PICO_SDK_PATH=../../pico-sdk
Run the cmake to generate Makefile file
cmake ..
Run the make command to build the codes and generate an executable file.
make -j9
After building, an uf2 file is generated. Press and hold the key on the Pico board to connect the Pico to the Raspberry Pi's USB port via the Micro USB cable, then release the key. Once connected, Raspberry will automatically recognize a removable disk (RPI-RP2). Copy the file main.uf2 in the corresponding folder to the recognized removable disk (RPI-RP2).
cp main.uf2 /media/pi/RPI-RP2/
If your Thonny doesn't support Pico, you can update it with the following command:
sudo apt upgrade thonny