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Display

Displays are great to get visual output from your system without the need to login. Here are different displays you can use.

SSD1306 I2C OLED Display

https://riton-duino.blogspot.com/2019/11/afficheur-oled-ssd1306-comparons.html

Wire it up

Connect your display to the referencing ports of your RPi

Display RPi
UCC/VCC/VDD/+ 3,3V
G/GND/- Ground, Mass
C/CL/SDC/SCK Clock if I2C
D/DA/SDA Data of I2C

enable I2C

power up your RPi and start the config tool sudo raspi-config. Go to Interfacing Options>I2C and activtate it with Yes. Exit the menu and restart your RPi.

If everything worked correct you can find the OLED Display Module’s Address

i2cdetect -y 1

If your RPi doesn't know i2cdetect install it with sudo apt-get install -y i2c-tools

Python library

Install OLED Python Library

# python requirements
apt install -y python3-dev python3-pil python3-smbus python3-pil python3-pip python3-setuptools python3-rpi.gpio python3-pip
# clone the repository
git clone https://github.com/adafruit/Adafruit_Python_SSD1306.git
# navigate to the library’s directory
cd Adafruit_Python_SSD1306
# install the library for Python3
sudo python3 setup.py install
# run some examples
cd examples
python3 stats.py

other libraries

https://github.com/adafruit/Adafruit_SSD1306.git https://github.com/greiman/SSD1306Ascii.git

Screen Size Adjustment

The Adafruit examples assume you have a 128×32 screen. They still run with a 128×64 pixel screen but it is better to change them before you move onto anything more complicated. To do this simply edit the scripts and disable the 128x32 config line by placing a # character at the front, and enable the 128x64 line by deleting the # character from the front.

Waveshare 2.13" E-ink HAT

Link to Waveshare

This HAT provides 250x120 pixels e-ink with embedded controller and SPI communication. You can easily just plug it into your RPis 40 Header. If you got passive coolers or something else in the way you can also un-solder the SPI header. All while still needing a very small potion of power (Standby $<0.017mW$).

enable SPI

The communication interface is SPI, so to use it enable it on your RPi with sudo raspi-config, choose Interfacing Options->SPI->Yes. Restart the RPi after that sudo reboot

install libraries

Open terminal of Raspberry Pi and run the following commands to install corresponding libraries. Install the libraries you need, not all of them are necessary.

Install BCM2835 libraries

wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz 
cd bcm2835-1.60/
sudo ./configure
sudo make
sudo make check
sudo make install

Install WiringPi libraries

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

Install Python2 libraries

sudo apt update
sudo apt install python-pip python-pil python-numpy
sudo pip install RPi.GPIO spidev

Install Python3 libraries

sudo apt update
sudo apt install python3-pip python3-pil python3-numpy
sudo pip3 install RPi.GPIO spidev

Demo Code & Examples

Clone demo codes from waveshare:

git clone https://github.com/waveshare/e-Paper

There are different examples for C and Python.

For C examples:

# enter folder of c samples
cd ~/e-Paper/RaspberryPi\&JetsonNano/
cd c
# modify the main.c and uncomment your display
sudo nano examples/main.c
# compile code
sudo make clean
sudo make
# run the example
sudo ./epd

For Python example:

# enter folder of python samples
cd ~/e-Paper/RaspberryPi\&JetsonNano/
cd python/examples
# list all files for different displays
ls -al
# run a chosen example
sudo python epd_xxx_test.py
sudo python3 epd_xxx_test.py

Sources and more

SSD1306 datasheet

Waveshare Wiki