Electronic Paper Display

Hardware

Inspiration

The inspiration and initial code for this project comes from this project: https://github.com/TomWhitwell/SlowMovie

Installation

Make sure SPI is enabled on the Raspberry Pi:

Run sudo raspi-config
Navigate to Interface Options > SPI
Select <Finish> to exit. Reboot if prompted.

Install depdendencies:

sudo apt install python3-pip
sudo apt install ffmpeg
pip3 install git+https://github.com/waveshare/e-Paper.git#subdirectory=RaspberryPi_JetsonNano/python&egg=waveshare-epd
pip3 install ffmpeg-python
pip3 install pillow
pip3 install git+https://github.com/robweber/omni-epd.git#egg=omni-epd

Schedule Cron jobs

On the host Raspberry Pi, schedule a cronjob to call the sync script every few minutes.

# Run Sync script every 2 minutes, "At every 2nd minute past every hour from 0 through 2 and every hour from 8 through 23."

*/2 0-2,8-23 * * * ~/epd/sync.py

@reboot ~/epd/sync.py

Create/clone epd directories

git clone git@github.com:dylanfisher/electronic-paper-display.git ~/epd

mkdir ~/epd_images

Create a .epd_screen_id file in each of the Raspberry Pi's epd directory. Add the index of the display, e.g. 1, 2, 3 or 4.

Scratchpad

Imagemagick conversions

Resize and crop images to fit the 2x2 EPD display grid

find . -maxdepth 1 -iname "*.jpg" | xargs -L1 -I{} convert -verbose -strip -thumbnail 1600x960^ -quality 40 -gravity center -extent 1600x960 -unsharp 0x.5 "{}" ~/_converted/"{}"

Potential idea for cropping into a single point of the image and displaying a particular zoomed-in point on each screen

find . -maxdepth 1 -iname "*.jpg" | xargs -L1 -I{} convert -extent 800x480 -verbose -quality 50 "{}" ~/_resized/"{}"

rsync

Sync resized source images to the Pi host

rsync -azP ~/_resized/ pi@10.0.0.5:~/Pictures

dylanfisher / electronic-paper-display