OctoPrint: Waveshare LCD + Raspberry PI 4

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August 11, 2020 by aubreykloppers

NOTE: DO NOT UPDATE RASPBERRY PI OS UNLESS YOU KNOW THE UPDATE TO WORK. AS OF TODAY (11/08/2020) THE UPDATING OF THE OS MAKES THE LCD USELESS

Getting OctoPrint on a Raspberry Pi 4b working is easy, getting a cheap chinx Touch Screen LCD (WaveShare 3.5″ touch LCD) working, is another story. Here follows my endeavors and recipe:

• Flash with OctoPi 0.17.0 image
• Burn to SD using Etcher
• Edit the “config.txt” file on the root of the SD Card with Notepad and add:

dtoverlay=piscreen,speed=16000000,rotate=90
# dtoverlay=ads7846,speed=500000,penirq=17,swapxy=1

• Assemble the LCD/RPi and boot.
• Open OctaPrint web-page and update.
• Install Plugin TouchUI
• Install LCD-show:

  # git clone https://github.com/waveshare/LCD-show.git
  # cd LCD-show/
  # ./LCD35C-show
  # git clone https://github.com/BillyBlaze/OctoPrint-TouchUI-autostart.git ~/TouchUI-autostart/
  # sudo ~/TouchUI-autostart/helpers/install
  # sudo vi /etc/default/touchui
	DISABLE_SCREENSAVER=true
  # sudo reboot

This should give a fully working Raspberry PI with a TouchScreen.

Links:

• https://www.balena.io/etcher/
• https://octoprint.org/download/
• https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(C)
• https://www.raspberrypi.org/products/raspberry-pi-4-model-b/
• https://community.octoprint.org/t/octoprint-raspberry-pi-4-3-5-touchscreen-configuration-raspbian-buster-goodtft-waveshare-xpt2046/13254

Final note: I have been able to run a Logitec Webcamera (a really old ball-type, not supported) with the following commands:

# sudo apt install fswebcam
# sudo usermod -a -G video pi

http://<IP>/webcam/?action=stream

I was also able to access the camera through OctoPrint…

Link:

• https://www.raspberrypi.org/documentation/usage/webcams/