RPi Relay Board (B)
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Introduction
We provide Raspberry Pi and Jetson Nano demo for this module
Interface introduce
The correspondence between relay channels and Pi pins:
| Channel number | RPi pin number | wiringPi | BCM | Description |
| Channel label | 29 | P21 | 5 | Channel 1 |
| Channel label | 31 | P22 | 6 | Channel 2 |
| Channel label | 33 | P23 | 13 | Channel 3 |
| Channel label | 36 | P27 | 16 | Channel 4 |
| Channel label | 35 | P24 | 19 | Channel 5 |
| Channel label | 38 | P28 | 20 | Channel 6 |
| Channel label | 40 | P29 | 21 | Channel 7 |
| Channel label | 37 | P25 | 26 | Channel 8 |
【Note】The silk screen marking on the PCB corresponds to the BCM code.
The use of yellow jumpers
Relay_JMP is the relay control pin selection jumper. When the jumpers are connected, the Raspberry Pi can be used to control the relays.
Working with Raspberry Pi
Install library
If you use bookworm system, you can only use lgpio library, bcm2835 and wiringPi can't be installed and used.
BCM2835
#Open the Raspberry Pi terminal and run the following command wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz tar zxvf bcm2835-1.71.tar.gz cd bcm2835-1.71/ sudo . /configure && sudo make && sudo make check && sudo make install # For more information, please refer to the official website: http://www.airspayce.com/mikem/bcm2835/
WiringPi
#Open the Raspberry Pi terminal and run the following command cd sudo apt-get install wiringpi #For Raspberry Pi systems after May 2019 (earlier than that can be executed without), an upgrade may be required: wget https://project-downloads.drogon.net/wiringpi-latest.deb sudo dpkg -i wiringpi-latest.deb gpio -v # Run gpio -v and version 2.52 will appear, if it doesn't it means there was an installation error # Bullseye branch system using the following command: git clone https://github.com/WiringPi/WiringPi cd WiringPi . /build gpio -v # Run gpio -v and version 2.70 will appear, if it doesn't it means there was an installation error
Python
# python2 sudo apt-get update sudo apt-get install python-pip sudo pip install RPi.GPIO # python3 sudo apt-get update sudo apt-get install python3-pip sudo pip3 install RPi.GPIO
Test demo
Execute the following commands on the terminal, download the demo, and extract it to the specified directory.
wget https://files.waveshare.com/upload/b/b4/RPi_Relay_Board_B.zip unzip -o RPi_Relay_Board_B.zip -d ./RPi_Relay_Board_B sudo chmod 777 -R RPi_Relay_Board_B cd RPi_Relay_Board_B/RaspberryPi/
BCM2835 demo
Enter the Linux terminal and execute the following command in the terminal:
cd bcm2835 make sudo ./Relay_demo
Expected result: The relays on the module are closed in turn, and then disconnected in turn. Each relay has a corresponding indicator light, which can be known by observing the status of the indicator light. When the user wants to stop running the program, press Ctrl+C to stop the running of the demo.
WiringPi demo
Enter the Linux terminal and execute the following command in the terminal:
cd wiringPi make sudo ./Relay_demo
Expected result: The relays on the module are closed in turn, and then disconnected in turn. Each relay has a corresponding indicator light, which can be known by observing the status of the indicator light. When the user wants to stop running the program, press Ctrl+C to stop the running of the demo.
Python demo
Enter the Linux terminal and execute the following command in the terminal:
cd python sudo python Relay_demo.py
Expected result: The relays on the module are closed in turn, and then disconnected in turn. Each relay has a corresponding indicator light, which can be known by observing the status of the indicator light. When the user wants to stop running the program, press Ctrl+C to stop the running of the demo.
Web control
The web page control of this demo is based on the Python web framework to control the relay.
Enter the Linux terminal and execute the following command in the terminal:
sudo apt-get install python-bottle cd python-bottle sudo python main.py
Enter the IP address of the Raspberry Pi in the address bar of Google Chrome (other browsers may not be compatible), port number 8080.
Working with Horizon Sunrise X3 Pi
RPI Relay Board (B)
Install Library File
sudo apt update sudo pip3 install bottle
Download Demo & Unzip to the Specified Directory
sudo apt-get install p7zip wget https://files.waveshare.com/upload/b/b4/RPi_Relay_Board_B.zip unzip -o RPi_Relay_Board_B.zip -d ./RPi_Relay_Board_B sudo chmod 777 -R RPi_Relay_Board_B cd RPi_Relay_Board_B/Sunrise_X3
Run the Demo
Python
cd python sudo python3 Relay_Module.py
Expected results: The relays on the module close and then break in sequence, each with a responsive indicator, which can be seen by observing the status of the indicator. When the user wants to stop running the program, press Ctrl+C to stop the demo.
Web Control
The web control for this routine is based on the Python web framework to control relays.
cd python-bottle sudo python3 main.py
Enter the Raspberry Pi IP address in the address bar of Google Chrome (other browsers may not be compatible), port number 8080.
Working with Jetson nano
Install library
sudo apt-get update sudo apt-get install python3-pip sudo pip3 install Jetson.GPIO sudo groupadd -f -r gpio sudo usermod -a -G gpio your_user_name sudo cp /opt/nvidia/jetson-gpio/etc/99-gpio.rules /etc/udev/rules.d/ sudo udevadm control --reload-rules && sudo udevadm trigger
Test demo
Download the demo and enter the specified directory.
sudo apt-get install p7zip wget https://files.waveshare.com/upload/c/c2/RPi_Relay_Board_B.7z 7zr x RPi_Relay_Board_B.7z -r -o./RPi_Relay_Board_B sudo chmod 777 -R RPi_Relay_Board_B cd RPi_Relay_Board_B/JetsonNano/
C demo
Enter the Linux terminal and execute the following command in the terminal:
cd C make sudo ./main
Expected result: The relays on the module are closed in turn, and then disconnected in turn. Each relay has a corresponding indicator light, which can be known by observing the status of the indicator light. When the user wants to stop running the program, press Ctrl+C to stop running the demo.
Python demo
Enter the Linux terminal and execute the following command in the terminal:
cd python sudo python relay_demo.py
Expected result: The relays on the module are closed in turn, and then disconnected in turn. Each relay has a corresponding indicator light, which can be known by observing the status of the indicator light. When the user wants to stop running the program, press Ctrl+C to stop the running of the demo.
Web control
The web page control of this demo is based on the Python web framework to control the relay.
Enter the Linux terminal and execute the following command in the terminal:
sudo apt-get install python-bottle cd python-bottle sudo python main.py
Enter the IP address of the Raspberry Pi in the address bar of Google Chrome (other browsers may not be compatible), port number 8080.
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