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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical overview of the Waveshare RPi Relay Board (B): an 8-channel relay expansion for Raspberry Pi, Horizon Sunrise X3 Pi and Jetson Nano. The module provides relays via GPIO pins; the channel-to-pin mapping is documented in a table.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL15423 WSAL15423 – Raspberry Pi 8-ch Relay Expansion Board]

== Technical overview ==
* The module offers eight relay channels controlled through specific Raspberry Pi GPIO pins.
* Channels 1–8 map to RPi pins 29, 31, 33, 36, 35, 38, 40 and 37 (BCM 5, 6, 13, 16, 19, 20, 21, 26).
* Yellow jumpers (Relay_JMP) select the relay control input; with jumpers inserted, the Raspberry Pi can drive the relays.
* For Raspberry Pi: install BCM2835, WiringPi or the Python library RPi.GPIO depending on OS branch (Bullseye uses apt instead of apt-get, Python 3 only; Bookworm supports only lgpio).
* Demo programs close then open the relays sequentially; each channel has an indicator LED showing state; press Ctrl+C to stop execution.
* Web control via the Python bottle framework on port 8080, accessed by entering the device IP address in a browser.
* For Horizon Sunrise X3 Pi: install bottle via pip3, run demo with python3 Relay_Module.py.
* For Jetson Nano: install Jetson.GPIO, set up the gpio group and udev rules, then run the C or Python demo plus web control.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
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
sudo apt-get install wiringpi
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
git clone https://github.com/WiringPi/WiringPi
cd WiringPi
./build
gpio -v
sudo apt-get update
sudo apt-get install python-pip
sudo pip install RPi.GPIO
sudo apt-get install python3-pip
sudo pip3 install RPi.GPIO
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
</syntaxhighlight>

== Notes and version constraints ==
* Exact voltage and current ratings of the relays are not provided; consult the datasheet.
* Compatibility with specific Raspberry Pi models and operating systems is version-dependent; confirm before use.
* Web control requires a compatible browser (source recommends Google Chrome); other browsers may have issues.
* On Bookworm only the lgpio library is available; BCM2835 and WiringPi cannot be installed there.
* Before running demos, ensure all dependencies are installed and permissions are correctly set.

== Source and revision record ==
* [https://www.waveshare.com/wiki/RPi_Relay_Board_(B) RPi Relay Board (B) - Waveshare Wiki]
* Source revision: 109833
* Captured: 2026-08-31T02:50:04+00:00
* SHA-256: <code>e5570cc8d7633a9c2c88375f95721cc777785badf93217b25d4bdda9dc56a10a</code>

WSAL15423 – RPi Relay Board (B)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex