pi-rack-oled (U6143_ssd1306)

This version extends the work of darkgrue and Gosherm, it provides the following features over the original Uctronics version:

• Displays hostname instead of IP address
• Top row is never deleted
• Correctly display CPU temperature units of measurement
• Added /proc/stat CPU calculation and enabled in favor of top (should be more accurate)
• Added df disk free space calculation and enabled in favor of statfs() (should be more portable)
• Refactored the way numbers were being pushed to the display that should result in better formatting
  • Fit decimals by width using significant figures
  • Right-justify fields (against labels)
• Fixed -Wall compiler warnings
• More robust error handling
• Added /contrib directory, support scripts
  • script to tar up files
  • systemd service script

I2C

Begin by enabling the I2C interface:

sudo raspi-config

Choose Interface Options | I2C, then answer Yes to whether you would like the ARM I2C interface to be enabled.

Install Git and library dependencies

sudo apt update
sudo apt install git -y

Clone project

git clone https://github.com/davidjbradshaw/pi-rack-oled.git

Compile

cd pi-rack-oled/C
make clean && make 

Run

sudo ./display

Add automatic start script

Copy the binary file to /usr/local/bin/:

sudo cp ./display /usr/local/bin/

Choose one of the following configuration options (systemd or rc.local):

sudo cp ../contrib/U6143_ssd1306.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable U6143_ssd1306.service
sudo systemctl start U6143_ssd1306.service

OR add the startup command to the rc.local script (not recommended)

sudo nano /etc/rc.local

and add the command to the rc.local file:

/usr/local/bin/display &

Reboot your system:

sudo reboot now