Pico-2CH-RS485

2-Channel RS485 Module for Raspberry Pi Pico, SP3485 Transceiver, UART To RS485

Overview

This is a 2-Channel RS485 module for Raspberry Pi Pico, SP3485 transceiver, UART To RS485.

Features

Standard Raspberry Pi Pico header supports Raspberry Pi Pico series.
Dual-channel design, each channel leads to two interfaces, which is convenient for users to choose from.
On-board TVS (transient voltage suppression tube), RS485 communication can effectively suppress the surge voltage and transient peak voltage in the circuit, lightning protection, and anti-static.
Provide online resources and manuals (example demos such as Raspberry Pi Pico C/C++ and MicroPython).

Specification

Operating voltage: 3.3V
Communication bus: UART
RS485 transceiver: SP3485
Baudrate: 300~500000bps
Dimension: 52.5mm × 21mm

Pinout

Hardware connection

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 of the Pico (also can be judged by the pin label of the module and 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

Connection

The connection of the RS485 board is same as the Pico-2CH-RS232.

Setup environment

To setup the Pico for working, please refer to the official guide: https://www.raspberrypi.org/documentation/pico/getting-started/

Download example

Open a terminal and run the following command:

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/9/94/Pico_2CH_RS485.7z
7z x Pico_2CH_RS485.7z -o./Pico_2CH_RS485
cd ~/Pico_2CH_RS485
cd c/build/

Run the examples

C codes

Go to the example directory and build it.

cd ~/Pico_2CH_RS485/c/

Create the build folder and add the 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 the 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/

Python codes

Use in Windows

1. Press and hold the BOOTSET button on the Pico board, connect the pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
2. Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the recognized removable disk (RPI-RP2).
3. Open Thonny IDE (Note: Use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3).
4. Click Tools->Settings->Interpreter, select Pico and the corresponding port as shown in the figure.

5. File -> Open -> the corresponding .py file, click to run, as shown in the following figure:

This demo provides a simple program...

Run in Raspberry Pi

Hold the BOOTSET key of the Pico board, then connect the Pico to Raspberry Pi by USB cable, then release the key.
Once the removable disk (RPI-RPI2) is recognized, copy the rp2-pico-20210418-v1.15.uf2 file to pico.
Open the Thonny IDE in Raspberry Pi, and update it if it doesn't support Pico.
Configure the port by choosing MicroPython (Raspberry Pi and ttyACM0 port) in Tools -> Options... -> Interpreter.

If your Thonny doesn't support Pico, you can update it with the following command:

sudo apt upgrade thonny

Choose File -> Open... -> python/ and select the corresponding .py file to run the codes.

Test Demo Function

It can achieve self-receiving and sending functions.

Resource

Documents

Demo Codes

Demo code

Serial Port Assistant

SSCOM5.13.1

Development Software

Pico Quick Start

Firmware Download

MicroPython Firmware Download

C_Blink Firmware Download

Text Tutorial

Introduction

Raspberry Pi Pico

MicroPython Series

C/C++ Series

For C/C++, it is recommended to use Pico VS Code for development. This is a Microsoft Visual Studio Code extension designed to make it easier for you to create, develop, and debug projects for the Raspberry Pi Pico series development board. Whether you are a beginner or an experienced professional, this tool can help you confidently and easily develop Pico. Below we will introduce how to install and use the extension.

Official website tutorial: https://www.raspberrypi.com/news/pico-vscode-extension/.
This tutorial is applicable to Raspberry Pi Pico, Pico2, and our company's RP2040 and RP2350 series development boards.
The development environment defaults to Windows as an example. For other environments, please refer to the official website tutorial for installation.

Arduino IDE Series

Install Arduino IDE

Download the Arduino IDE installation package from Arduino website.
Just click on "JUST DOWNLOAD".
Click to install after downloading.
Note: You will be prompted to install the driver during the installation process, we can click Install.

Install Arduino-Pico Core on Arduino IDE

Open Arduino IDE, click the File on the left corner and choose "Preferences".

Add the following link in "Additional boards manager URLs", then click OK.

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Note: If you already have the ESP32 board URL, you can separate the URLs with commas like this:

https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Click on Tools -> Board -> Board Manager -> Search for pico, it shows installed since my computer has already installed it.

Upload Demo At the First Time

Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer via the Micro USB cable, and release the button when the computer recognizes a removable hard drive (RPI-RP2).
Download the demo from #Resource, open the D1-LED.ino under arduino\PWM\D1-LED path.
Click Tools -> Port, remember the existing COM, do not need to click this COM (different computers show different COM, remember the existing COM on your computer).
Connect the driver board to the computer with a USB cable, then click Tools -> Ports, select uf2 Board for the first connection, and after the upload is complete, connecting again will result in an additional COM port.
Click Tools -> Board -> Raspberry Pi Pico/RP2040 -> Raspberry Pi Pico.
After setting, click the right arrow to upload.
- If you encounter problems during the period, you need to reinstall or replace the Arduino IDE version, uninstall the Arduino IDE clean, after uninstalling the software you need to manually delete all the contents of the folder C:\Users\[name]\AppData\Local\Arduino15 (you need to show the hidden files in order to see it) and then reinstall.

Open Source Demo

FAQ

Question:Will these LEDs light up even if no code is running on the Pico?

Answer:

This needs to run the demo, and it lights up when the data is sent or received.

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Support

Technical Support

If you need technical support or have any feedback/review, please click the Submit Now button to submit a ticket, Our support team will check and reply to you within 1 to 2 working days. Please be patient as we make every effort to help you to resolve the issue.
Working Time: 9 AM - 6 PM GMT+8 (Monday to Friday)

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