Raspberry Pi Fan HAT User Guide

Introduction

This is a PWM controlled Fan HAT, which is designed for Raspberry Pi, I2C Bus, PCA9685 driver, it can be used as a temperature monitor as well.

Features

• PCA9685 PWM driver as the fan controller, powerful driving capability, auto PWM adjustment
• 0.91" OLED, 128x32 pixels, displays board temperature or other user-defined content in real-time
• Adopts 3007 size PWM controlled fan, up to 8000rpm speed, brings strong airflow
• Supports retrieving temperature data in real-time, and then adjusting the speed automatically, programmable configuration
• I2C pins, for connecting other host control boards
• 16-ch PWM outputs, for driving other external PWM devices
• Comes with heat sinks, better cooling effect

Specifications

• Operating voltage: 5V
• Logic level: 3.3V
• Driver: PCA9685
• Interface: I2C
• Fan PWM driver duty cycle: ≥25%
• Fan RPM (max): 8000 RPM
• OLED driver: SSD1306
• OLED resolution: 128×32
• OLED display color: White
• OLED FOV: > 160°
• Mounting holes: 3.0mm

About board

1. Standard Raspberry Pi 40PIN GPIO header
2. PCA9685 PWM driver
3. 3007 size PWM controlled adjustable fan
4. PCA9685 I2C address configuration
5. Reserved I2C control pins
6. Reserved PCA9685 output channels
7. 0.91inch OLED display

Pinout

Relationiship of temperature and Fan speed

Example

Hardware connection

First at all, please connect the Fan HAT to Raspberry Pi by attaching it on the 40PIN GPIO
The standoffs and screws can be sued to hold the Fan HAT in another side.

Libraries installation

Open the terminal of Raspberry Pi and install libraries as guides below

Install WiringPi Library

cd
sudo apt-get install wiringpi
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v

Install C Library bcm2835

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

For more information and the newest libraries please refer to website：http://www.airspayce.com/mikem/bcm2835/

Install Python Library

For python2

cd
sudo apt-get update
sudo apt-get install python-pip
sudo pip install RPi.GPIO

For python3

cd
sudo apt-get update
sudo apt-get install python3-pip
sudo pip install RPi.GPIO

Download example

Open the terminal and run the following commands to download example

cd
sudo apt-get install p7zip-full
wget https://www.waveshare.com/w/upload/0/06/Fan_HAT.7z
7z x Fan_HAT.7z  -r -o./Fan_HAT

Run the example

C

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

Python

cd
cd Fan_HAT/python/
sudo python main.py

Run when booting

Modify rc.local script

sudo nano /etc/rc.local

Add the lines below to the script, you need to set them in the front of exit 0

fi
sudo /home/pi/Fan_HAT/c/main &
#exit 0

Documents

• Schematic
  
• SSD1306 datasheet
  
• RT9193 datasheet
  
• PCA9685 datasheet
  

Example

• Codes
  

To：

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