Quelltext der Seite WSAL18014 – PoE HAT (B)/en

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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 ==
The PoE HAT (B) is a Power-over-Ethernet module for Raspberry Pi 3B+/4B. It powers and connects the Pi over a single network cable using the 802.3af standard.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL18014 WSAL18014 – Power over Ethernet HAT (B) for Raspberry Pi 3B+/4B and 802.3af PoE network]

== Technical overview ==
* Compatible with Raspberry Pi 3B+ and 4B
* PoE input voltage: 37 V to 57 V DC
* Output voltage: 5 V / 2.5 A
* OLED display: 0.91 inch, resolution 128×32, driver chip SSD1306
* I/O expansion via I2C using a PCF8574 chip (8 outputs)
* Board dimensions: 65.0 × 56.5 mm; height approx. 27.5 mm
* Integrated fan with switch; temperature readout on the OLED

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
sudo apt-get install wiringpi
wget https://files.waveshare.com/wiki/PoE_HAT_B/PoE_HAT_B_code.zip
unzip -o PoE_HAT_B_code.zip -d ./PoE_HAT_B_code
sudo chmod 777 -R PoE_HAT_B_code
make clean && make
sudo ./main
sudo python main.py
sudo nano /etc/systemd/system/POE_OLED_Python_Service.service
sudo systemctl start POE_OLED_Python_Service.service
sudo systemctl enable POE_OLED_Python_Service.service
sudo nano /etc/rc.local
</syntaxhighlight>

== Notes and version constraints ==
* The source contains template placeholders (&#123;&#123;&#123;name2&#125;&#125;&#125; etc.), which were ignored.
* Some steps are version-sensitive: On Bullseye/Bookworm only certain libraries are available (e.g., only lgpio).
* The Python interpreter path in the service file must be confirmed with “which python3.”
* For older systems, rc.local is used; the command must run with &amp; or boot may hang.
* Third-party programs are not maintained by Waveshare; test the demo first to rule out hardware issues.

== Source and revision record ==
* [https://www.waveshare.com/wiki/PoE_HAT_(B) PoE HAT (B) - Waveshare Wiki]
* Source revision: 107144
* Captured: 2026-09-01T02:55:37+00:00
* SHA-256: <code>471504a36d74f53ea296b623b28352f991b684fecd20804599ebf35071eccb60</code>