Pi setup

Flash an image using the Raspberry Pi imager, I picked the Raspberry Pi OS Lite (based on debian trixie) and set up WiFi & SSH from the Customisation settings.

First commands

sudo raspi-config   # Then select: Interface Options -> SPI -> Enable

sudo apt update && sudo apt upgrade
sudo apt install -y python3-pip python3-pil python3-smbus python3-numba

sudo systemctl mask swap.target
sudo systemctl disable --now bluetooth
sudo nmcli c modify <your-connection> 802-11-wireless.powersave 2

Reduce SD card writes by setting Storage=volatile in /etc/systemd/journald.conf.

Deploying

Ensure .env has the correct paths and then run:

./sync.sh

That rsyncs src/ over.

Setting up cron

In crontab -e, add:

*/15 * * * * cd ~/frame && python3 display.py -o 90 >> ~/frame.log 2>&1

Optionally, to monitor the wifi connection:

In sudo crontab -e, add:

@reboot /usr/sbin/iw wlan0 set power_save off*/5 * * * * /home/<user>/frame/wifi-check.sh >> /home/<user>/wifi.log 2>&1

Hardware notes

The driver in src/lib/waveshare_epd/ is adapted from Waveshare's PhotoPainter project. That wikipage has the wiring, init sequence, and 6-colour palette docs.

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