Difference between revisions of "PoE HAT (B)"
Line 23: | Line 23: | ||
*Network standard: 802.3af PoE | *Network standard: 802.3af PoE | ||
*Dimensions: 56.5mm x 65mm | *Dimensions: 56.5mm x 65mm | ||
+ | *OLED control interface: I2C | ||
*OLED size: 0.91inch | *OLED size: 0.91inch | ||
*OLED pixels: 128x32 | *OLED pixels: 128x32 | ||
*OLED driver: SSD1306 | *OLED driver: SSD1306 | ||
*OLED display color: White | *OLED display color: White | ||
+ | *OLED viewing angle: greater than 160° | ||
+ | *GPIO expansion interface: I2C | ||
+ | *GPIO expansion chip: PCF8574 | ||
+ | |||
==Examples== | ==Examples== | ||
===Hardware connection=== | ===Hardware connection=== |
Revision as of 03:18, 28 March 2022
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Instroduction
This Power Over Ethernet HAT (Type B) is designed for Raspberry Pi 3B+/4B, it supports 802.3af Power-Sourcing equipment for PoE function.
Features
- Standard Raspberry Pi 40PIN GPIO header, supports Raspberry Pi 3B+/4B
- PoE (Power Over Ethernet) capability,802.3af-compliant
- Fully isolated switched-mode power supply (SMPS)
- 0.91" OLED, for monitoring processor temperature, IP address, and fan status in real-time
- Onboard cooling fan, allows auto running on powerup OR programmable control, configured by the switch
- Integrates PCF8574 IO expander for I2C bus, providing pin P0 for directly fan control, and more spare IO pin
Specifications
- PoE Power input: 37V ~ 57V DC in
- PoE Power output: 5V 2.5A DC out
- Network standard: 802.3af PoE
- Dimensions: 56.5mm x 65mm
- OLED control interface: I2C
- OLED size: 0.91inch
- OLED pixels: 128x32
- OLED driver: SSD1306
- OLED display color: White
- OLED viewing angle: greater than 160°
- GPIO expansion interface: I2C
- GPIO expansion chip: PCF8574
Examples
Hardware connection
You need to connect the PoE HAT to Raspberry Pi as picture
Enable I2C Interface
I2C interface is required for the OLED display, you need to first enable the i2c interface for properly work.
Open a terminal of Raspberry Pi and configure:
sudo raspi-config Interfacing Options -> I2C -> Yes
Libraries installation
Libraries Installation for RPi
First of all you make sure to use which language C or python Open the terminal of Raspberry Pi and install libraries as guides below
Install Library
If you use the 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, you can refer to the official website at: 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
lgpio
#Open the Raspberry Pi terminal and run the following command wget https://github.com/joan2937/lg/archive/master.zip unzip master.zip cd lg-master sudo make install # You can refer to the official website for more: https://github.com/gpiozero/lg
Install Python Library
#python2 sudo apt-get update sudo apt-get install python-pip sudo pip install RPi.GPIO sudo apt-get install python-smbus #python3 sudo apt-get update sudo apt-get install python3-pip sudo pip install RPi.GPIO sudo apt-get install python3-smbus
Download example
Open a terminal and download with commands below.
cd wget https://www.waveshare.com/w/upload/8/8b/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
Run the example
Open a terminal and run the example
- C
cd ~/PoE_HAT_B_code/c/ make clean make sudo ./main
- python
cd ~/PoE_HAT_B_code/python/examples sudo python main.py
Set the temperature threshold
- C
sudo nano ~/PoE_HAT_B_code/c/examples/main.c
Modify the last parameter of POE_HAT_Display() and save
- python
sudo nano ~/PoE_HAT_B_code/python/examples/main.py
Modify the last parameter of POE.POE_HAT_Display() and save
Auto-run
Modify rc.local file
sudo nano /etc/rc.local
- Add the following line in front of the line exit 0
fi sudo /home/pi/PoE_HAT_B_code/c/main & #exit 0
or
fi sudo python3 /home/pi/PoE_HAT_B_code/python/examples/main.py & #exit 0
Resources
Documents
Example
Third Party Examples
Support
Support
If you require technical support, please go to the Support page and open a ticket.