Power over Internet(POE) Hat for Raspberry Pi

Introduction

Do you still worry about Raspberry Pi Zero access to various USB devices? So,it's your right choice. It is a USB Hub for RPI Zero, it has 4 USB extension interface and external battery. The 4 pogo pins on the back will connect the PP1, PP6, PP22 and PP23 testing pads on your Raspberry Pi Zero – no soldering required! You can also power PRI zero by USB cable or a chargeable battery. Only need a few studs can connect it with RPI Zero, it so convenient for saving a lot of wiring problems.

Model: RPA20901S

Features

• Support PoE Power over Ethernet, support 802.3af PoE network standard
• Fully isolated switch mode power supply (SMPS)
• With 0.91" OLED for monitoring processor temperature, IP address, and fan status in real-time.
• Support real-time temperature reading and intelligent cooling
• With cooling fan, allows auto running on powerup or programmable control configured by switch
• Integrates PCF8574, 8 channels of I/O ports can be expanded through I2C, which can directly control the fan

Specification

• POE input voltage: 37V ~ 57V DC
• POE output voltage: 5V 2.5A DC
• Network standard: 802.3af PoE
• OLED control interface: I2C
• OLED size: 0.91 inches
• OLED resolution: 128×32
• OLED driver chip: SSD1306
• OLED resolution: 65.0x56.5mm
• OLED display color: white
• OLED viewing angle: greater than 160°
• GPIO expansion interface: I2C
• GPIO expansion chip: PCF8574

Usage

Plug PoE_HAT(B) into the Raspberry Pi, as shown in the figure below.

• Step 1. Install the necessary library
  

1) Install BCM2835, open the Raspberry Pi terminal, and run the following command

HTTP wget : //www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
zxvf bcm2835 tar - 1.60 . tar . GZ
bcm2835 cd - 1.60 /
sudo ./ the configure
sudo make && sudo make check && sudo make install

2) Update wiringPi to version 2.52

sudo apt - get install wiringpi
HTTPS wget : //project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg - i wiringpi - latest . deb
gpio - v
#You will see gpio version: 2.52, indicating successful installation

3) Install Python library

#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 pip install RPi . GPIO

• Step 2. Download the sample program
  

sudo apt - get install p7zip - full
HTTP wget : //www.waveshare.net/w/upload/b/b7/PoE_HAT_B_code.7z
7z x PoE_HAT_B_code . 7z - r - o ./ PoE_HAT_B_code

• Step3. Run the test routine
  

1) C

cd PoE_HAT_B_code / c /
make clean 
make
sudo ./ main

2) Python

cd PoE_HAT_B_code / python /
sudo python main . py

• Set the fan start temperature
  

#C
Nano examples the sudo / main . C
# POE_HAT_Display() The last parameter of the function sets the fan opening temperature
 
#python 
Nano examples sudo / main . Py
# POE.POE_HAT_Display() Function parameter to set the fan opening temperature

• Set boot up
  

1) Before setting the startup, compile the routine first.

Nano sudo / etc / rc . local

2) Set boot up. Add sudo /home/pi/Fan_HAT/c/main & before exit 0. Note that you must add "&" to run in the background, otherwise the system may not start.

fi
sudo / home / pi / PoE_HAT_B_code / c / main &
exit 0