Pico-Relay-B

Overview

Industrial 8-Channel Relay Module For Raspberry Pi Pico, Power Supply Isolation, Photocoupler Isolation.

Features

Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal.
Onboard photocoupler isolation, prevent interference from external high-voltage circuit connected to the relay.
High-quality relay, contact rating: 10A 250V AC or ≤10A 30V DC.
ABS protection enclosure with rail-mount support, easy to install, safe to use.
Breakout USB port and BOOT pin, make it easy to debug without disassembling the enclosure.
PWR indicator, RGB LED, and passive buzzer outside the enclosure.

Specifications

Operating voltage: 5V
Communication Protocol: USB
Communication interface: Micro USB
Relay channel: 8 ch
Contact form: 1NO 1NC
Dimension: 88（H）x 122（V） mm

Pinout

Pico User Guide

Hardware connection

Relay B	Pico	Description
VCC	VSYS	Power input
GND	GND	Ground
CH1	GP21	Control pin of Channel 1
CH2	GP20	Control pin of Channel 2
CH3	GP19	Control pin of Channel 3
CH4	GP18	Control pin of Channel 4
CH5	GP17	Control pin of Channel 5
CH6	GP16	Control pin of Channel 6
CH7	GP15	Control pin of Channel7
CH8	GP14	Control pin of Channel 8
RGB	GP13	Control pin of RGB LED
BUZZER	GP6	Control pin of buzzer

Connection

Download the SSCOM serial port debugging assistant and open it on the computer, open the corresponding port number, set the baud rate to 115200, and click the corresponding function to send the corresponding command.

Setup environment

1. For the Raspberry Pi environment setting, please refer to link.
2. For the Windows environment setting, please refer to link.

Raspberry Pi

1. Open a terminal of Raspberry Pi.
2. Download and unzip the demo codes to the directory Pico C/C++ SDK.

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/5/5a/Pico-Relay-B_code.7z
 
7z x Pico-Relay-B_code.7z -o./Pico-Relay-B_code
cd ~/Pico-Relay-B_code
cd c/build/

C

1. Hold the BOOTSEL button of Pico, and connect the USB interface of Pico to Raspberry Pi then release the button.
2. Go into the build directory and add the SDK path.

cd ~/Pico-Relay-B_code/c/
cd build
export PICO_SDK_PATH=../../pico-sdk

3. Run the command cmake to generate the Makefile file.

cmake ..

4. Run the command make to build and generate the executable file.

make -j9

4. after building, a uf2 file is generated. Press and hold the button of the Pico board, connect it to Raspberry Pi by USB cable, and then release the button. Copy the main.uf2 file generated to the recognized movable disk (RPI-RP2).

cp main.uf2 /media/pi/RPI-RP2/

Send hexadecimal commands to Relay via serial port for control of:

01: Relay switch #1
02: No.2 relay switch
03: No.3 relay switch
04: Relay switch #4
05: No.5 relay switch
06: No.6 relay switch
07: No.7 relay switch
08: No.8 relay switch
09: Relay fully off
0A: Relay fully open

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 uf2 file in the python directory to the recognized removable disk (RPI-RP2).
- Pico: rp2-pico-20210418-v1.15.uf2
- Pico 2: rp2-pcio2-20240809-v1.24.0.uf2
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, and 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:

After running, you can send the command directly in the Shell, the command is as follows:

1: Relay switch No. 1
2: Relay switch No. 2
3: Relay switch No. 3
4: Relay switch No. 4
5: Relay switch No. 5
6: No. 6 relay switch
7: Relay switch No. 7
8: No. 8 relay switch
9: The relay is fully closed
10: The relay is fully open

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, 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.
After running, you can send the command directly in the Shell, the command is as follows:

1: Relay switch No. 1
2: Relay switch No. 2
3: Relay switch No. 3
4: Relay switch No. 4
5: Relay switch No. 5
6: No. 6 relay switch
7: Relay switch No. 7
8: No. 8 relay switch
9: The relay is fully closed
10: The relay is fully open

Pico W

Due to the change in the location of Pico W's BOOT pads, the Pico W cannot be entered into burn-in mode through the BOOT switch that comes with the bottom board.

Demo Download

Open the Raspberry Pi terminal and execute:

cd ~
sudo wget  https://files.waveshare.com/upload/0/0c/Pico-w-Relay-demo.zip
unzip Pico-w-Relay-demo.zip

Demo Use

C

Enter the Pico_Relay_Tcp.c file in examples, and set up the wifi name, wifi password, server IP, and server port.

sudo nano ~/Pico-w-Relay-demo/c/examples/Pico_Relay_Tcp.c

The following tutorial is for operation on Raspberry Pi, but due to the multi-platform and portable nature of CMake, it can be successfully compiled on a PC, but the operation is slightly different and requires your own judgment.

To do the compilation, make sure that the c directory:

 cd ~/Pico-w-Relay-demo/c/

Create and enter the build directory, and add the SDK: where . /... /pico-sdk is the directory of your SDK. There is a build in our sample application, just enter it directly:

cd build
export PICO_SDK_PATH=../../pico-sdk
(Note: Be sure to write the right path to your own SDK)

Execute CMake and automatically generate Makefile:

cmake ..

Execute make to generate the executable file, the first compilation time is longer:

make -j9

When the compilation is complete, the uf2 file will be generated. Press and hold the button on the Pico board, connect the pico to the USB port of the Raspberry Pi via the micro USB cable, and then release the button. Once connected, the Raspberry Pi will automatically recognize a removable disk (RPI-RP2), copy the main.uf2 file from the build folder to the recognized removable disk (RPI-RP2).

cp main.uf2 /media/pi/RPI-RP2/

Sending string commands to Relay via TCP server for control:

Relay 1: Relay switch No. 1
Relay 2: Relay switch No. 2
Relay 3: Relay switch No. 3
Relay 4: Relay switch No. 4
Relay 5: Relay Switch No. 5
Relay 6: Relay Switch No. 6
Relay 7: Relay Switch No. 7
Relay 8: Relay 8 switch
Relay ALL OFF: Relay all off
Relay ALL ON: Relay ALL ON

Python

Enter TCP_Relay.py file in Python, and set up the wifi name, wifi password, server IP, and server port.

Windows

1. 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 after the computer recognizes a removable disk (RPI-RP2).
2. Copy the rp2-pico-w-20230209-v1.19.1.uf2 file from the python directory to the recognized removable disk (RPI-RP2).
3. Open the Thonny IDE (note: use the latest version of Thonny, otherwise there is no support package for Pico, the latest version for Windows is v3.3.3).
4. Click Tools -> Settings -> Interpreter, and select Pico and the corresponding port as shown in the picture.

5. File -> Open -> Pico-Relay-B_test.py, click to run and as shown below:

After running, you can directly send the commands in Shell, the commands as shown below:

1: No.1 relay switch
2: No.2 relay switch
3: No.3 relay switch
4: No.4 relay switch
5: No.5 relay switch
6: No.6 relay switch
7: No.7 relay switch
8: No.8 relay switch
9: Relay full off
10: Relay fully open

Raspberry Pi

1. The process of firmware flushing is the same as on Windows, you can choose to copy the pico_micropython_20210121.uf2 file into pico on a PC or Raspberry Pi.
2. Open the Thonny IDE in Raspberry Pi Mountain (click Raspberry logo -> Programming -> Thonny Python IDE), you can check the version information in Help->About Thonny

To make sure your version has the Pico support package, also you can click on Tools -> Options... -> Interpreter to select MicroPico. -> Interpreter to select MicroPython (Raspberry Pi Pico and ttyACM0 port.) As shown in the image:

If your current Thonny version has no Pico support package, you can input the following commands to update Thonny IDE:

sudo apt upgrade thonny

3. Click File -> Open... -> python/Pico-Relay-B.py, and run the script:
Sending string commands to Relay via TCP server for control:

Relay 1: Relay 1 switch 
Relay 2: Relay 2 switch   
Relay 3: Relay 3 switch 
Relay 4: Relay 4 switch  
Relay 5: Relay 5 Switch  
Relay 6: Relay 6 Switch 
Relay 7: Relay 7 Switch  
Relay 8: Relay 8 switch
Relay ALL OFF: Relay all off
Relay ALL ON: Relay ALL ON

Resource

Document

Schematic

Demo codes

Software

Development Software

Pico Getting Started

Firmware Download

MicroPython Firmware Download

C_Blink Firmware Download

Introduction

Raspberry Pi Pico Basics

MicroPython Series

Install Thonny IDE

In order to facilitate the development of Pico/Pico2 boards using MicroPython on a computer, it is recommended to download the Thonny IDE

Download Thonny IDE and follow the steps to install, the installation packages are all Windows versions, please refer to Thonny's official website for other versions
After installation, the language and motherboard environment need to be configured for the first use. Since we are using Pico/Pico2, pay attention to selecting the Raspberry Pi option for the motherboard environment

Configure MicroPython environment and choose Pico/Pico2 port
- Connect Pico/Pico2 to your computer first, and in the lower right corner of Thonny left-click on the configuration environment option --> select Configture interpreter
- In the pop-up window, select MicroPython (Raspberry Pi Pico), and choose the corresponding port

Flash Firmware

Click OK to return to the Thonny main interface, download the corresponding firmware library and burn it to the device, and then click the Stop button to display the current environment in the Shell window
Note: Flashing the Pico2 firmware provided by Micropython may cause the device to be unrecognized, please use the firmware below or in the package
- Pico firmware library
- Pico2 firmware library
How to download the firmware library for Pico/Pico2 in windows: After holding down the BOOT button and connecting to the computer, release the BOOT button, a removable disk will appear on the computer, copy the firmware library into it
How to download the firmware library for RP2040/RP2350 in windows: After connecting to the computer, press the BOOT key and the RESET key at the same time, release the RESET key first and then release the BOOT key, a removable disk will appear on the computer, copy the firmware library into it (you can also use the Pico/Pico2 method)

MicroPython Series

【MicroPython】 machine.Pin class function details
【MicroPython】machine.PWM class function details
【MicroPython】machine.ADC class function details
【MicroPython】machine.UART class function details
【MicroPython】machine.I2C class function details
【MicroPython】machine.SPI class function details
【MicroPython】rp2.StateMachine class function details

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 boards. No matter if you are a beginner or an experienced professional, this tool can assist you in developing Pico with confidence and ease. Here's how to install and use the extension.

Official website tutorial: https://www.raspberrypi.com/news/pico-vscode-extension/
This tutorial is suitable for Raspberry Pi Pico, Pico2 and the RP2040 and RP2350 series development boards developed by Waveshare
The development environment defaults to Windows. For other environments, please refer to the official tutorial for installation

Install VSCode

First, click to download pico-vscode package, unzip and open the package, double-click to install VSCode

Note: If vscode is installed, check if the version is v1.87.0 or later

Install Extension

Click Extensions and select Install from VSIX
Select the package with the vsix suffix and click Install
Then vscode will automatically install raspberry-pi-pico and its dependency extensions, you can click Refresh to check the installation progress
The text in the right lower corner shows that the installation is complete. Close VSCode

Configure Extension

Open directory C:\Users\username and copy the entire .pico-sdk to that directory
The Copy is completed

Open vscode and configure the paths for the Raspberry Pi Pico extensions

The configuration is as follows:

Cmake Path:
${HOME}/.pico-sdk/cmake/v3.28.6/bin/cmake.exe

Git Path:
${HOME}/.pico-sdk/git/cmd/git.exe    

Ninja Path:
${HOME}/.pico-sdk/ninja/v1.12.1/ninja.exe

Python3 Path:
${HOME}/.pico-sdk/python/3.12.1/python.exe

New Project

The configuration is complete, create a new project, enter the project name, select the path, and click Create to create the project
To test the official example, you can click on the Example next to the project name to select
The project is created successfully
Select the SDK version
Select Yes for advanced configuration
Choose the cross-compilation chain, 13.2.Rel1 is applicable for ARM cores, RISCV.13.3 is applicable for RISCV cores. You can select either based on your requirements
Select default for CMake version (the path configured earlier)
Select default for Ninjaversion
Select the development board
Click Complie to compile
The uf2 format file is successfully compiled

Import Project

The Cmake file of the imported project cannot have Chinese (including comments), otherwise the import may fail
To import your own project, you need to add a line of code to the Cmake file to switch between pico and pico2 normally, otherwise even if pico2 is selected, the compiled firmware will still be suitable for pico
set(PICO_BOARD pico CACHE STRING "Board type")

Update Extension

The extension version in the offline package is 0.15.2, and you can also choose to update to the latest version after the installation is complete

Arduino IDE Series

Install Arduino IDE

First, go to Arduino official website to download the installation package of the Arduino IDE.
Here, you can select Just Download.
Once the download is complete, click Install.

Notice: During the installation process, it will prompt you to install the driver, just click Install
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Arduino IDE Interface

After the first installation, when you open the Arduino IDE, it will be in English. You can switch to other languages in File --> Preferences, or continue using the English interface.
In the Language field, select the language you want to switch to, and click OK.

Install Arduino-Pico Core in the Arduino IDE

Open the Arduino IDE, click on the file in the top left corner, and select Preferences

Add the following link to the attached board manager URL, and then click OK

https://github.com/earlephilhower/arduino-pico/releases/download/4.0.2/package_rp2040_index.json

Note: If you already have an ESP32 board URL, you can use a comma to separate the URLs as follows:

https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/4.0.2/package_rp2040_index.json

Click Tools > Development Board > Board Manager > Search pico, as my computer has already been installed, it shows that it is installed

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 after the computer recognizes a removable hard disk (RPI-RP2).
Download the program and open D1-LED.ino under the arduino\PWM\D1-LED path
Click Tools --> Port, remember the existing COM, do not click this COM (the COM displayed is different on different computers, remember the COM on your own computer)
Connect the driver board to the computer using a USB cable. Then, go to Tools > Port. For the first connection, select uf2 Board. After uploading, when you connect again, an additional COM port will appear
Click Tools > Development Board > Raspberry Pi Pico > Raspberry Pi Pico or Raspberry Pi Pico 2
After setting it up, click the right arrow to upload the program

If issues arise during this period, and if you need to reinstall or update the Arduino IDE version, it is necessary to uninstall the Arduino IDE completely. After uninstalling the software, you need to manually delete all contents within the C:\Users\[name]\AppData\Local\Arduino15 folder (you need to show hidden files to see this folder). Then, proceed with a fresh installation.

Open Source Demos

MircoPython video demo (github)
MicroPython firmware/Blink demos (C)
Raspberry Pi official C/C++ demo (github)
Raspberry Pi official micropython demo (github)
Arduino official C/C++ demo (github)

Support

Technical Support

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Pico Relay B

Overview

Features

Specifications

Pinout

Pico User Guide

Hardware connection

Connection

Setup environment

Raspberry Pi

C

Python codes

Use in Windows

Run in Raspberry Pi

Pico W

Demo Download

Demo Use

C

Python

Windows

Raspberry Pi

Resource

Document

Demo codes

Software

Development Software

Pico Getting Started

Firmware Download

Introduction

MicroPython Series

Install Thonny IDE

Flash Firmware

MicroPython Series

C/C++ Series

Install VSCode

Install Extension

Configure Extension

New Project

Import Project

Update Extension

Arduino IDE Series

Install Arduino IDE

Arduino IDE Interface

Install Arduino-Pico Core in the Arduino IDE

Upload Demo at the First Time

Open Source Demos

Support