RPiFEBP

Revision

• 2021-09-26:V1.0

Descriptions

RPiFEBP stands for Raspberry Pi Fan Expansion Board Plus. It is a fan expansion board with 0.91 OLED Display and 4007 PWM Fan onboard, 4 programable LED indicators under the PCB board.

Features

• 0.91 inch OLED Display(support I2C protocol)
• Speed Adjustable Fan (PWM FAN)
• Programable LED Indicator
• Raspberry Pi Hat Style

How to Assemble.

• Just insert it into Raspberry Pi 40Pin Header.

How to Setup Fan

• Recommend OS: Raspberry Pi OS (Buster) or later.
• Requirements:

• SSD1306 library for OLED
• SMBUS library for I2C device control
• wiringPi library for LED indicators control

• Open a terminal and typing:

sudo raspi-config

Navigate to 4 Performance Options -> Fan -> YES -> 14(to which GPIO is the fan connected) -> 60 (Temprature trigger) -> yes -> reboot

• Or you can write C code or python script to generate PWM wave and send it to GPIO 14(BCM14) to control the Fan speed as your will.

How to Setup OLED Display

• Enable I2C interface

sudo raspi-config`

Navigate to Interface Options -> I2C -> Enable -> YES.

• Detect If OLED has been recognized.

i2cdetect -y 1

It will shows an address: 0x3c

Installation and Upgrade

• Adafruit_SSD1306 and Adafruit-BBIO Those library and its dependency(Adafruit GPIO library) can be installed from PyPI by executing:

sudo pip3 install pi-ina219
sudo pip3 install Adafruit-SSD1306
sudo pip3 install Adafruit-BBIO

or you can download and install it by manual:

• Download SSD1306 library:

sudo python -m pip install --upgrade pip setuptools wheel
git clone https://github.com/adafruit/Adafruit_Python_SSD1306.git
cd Adafruit_Python_SSD1306
sudo python setup.py install
pip install Adafruit-BBIO

Demo Code Download

• Download Demo Code:

git clone https://github.com/geeekpi/RPiFEBP.git
cd RPiFEBP/
python3 oled.py & 

How to Setup LED indicator

• Reinstall wiringPi library.

sudo apt -y purge wiringpi
hash -r 
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio readall

• LED indicators Pin out There are 4 LED under the PCB board.

• LED1 - nearby the GPIO pins and fan on left corner, connect to GPIO 24 (BCM 19)
• LED2 - under LED1, connect to GPIO 23 (BCM 13)
• LED3 - on the right of LED2, connect to GPIO 22 (BCM 6)
• LED4 - on the top of LED3, connect to GPIO 21 (BCM 5)

• Demo code in shell:

for i in `seq 21 24`
 do 
    gpio mode $i out
 done 

while true
do 
  for i in `seq 21 24`
  do
	gpio write $i 1 
  	sleep 0.01
  	gpio write $i 0
  done
done

Control LED on the bottom of expansion board by using RPi.GPIO library.

• Demo code in Python:

import RPi.GPIO as GPIO
import time 


# BCM Number of LED indicators
leds = [5, 6, 13, 19]

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

for i in range(len(leds)):
    GPIO.setup(leds[i], GPIO.OUT)



try:
    while True:
	for led in leds:
       	    GPIO.output(led, GPIO.HIGH)
	    time.sleep(0.01)
            GPIO.output(led, GPIO.LOW)
except KeyboardInterrupt:
    GPIO.cleanup()
    print("BYE")

Have Fun