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octoprint-display

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PyPortal OctoPrint Display

Simple display for OctoPrint status and activity.

Requirements

  1. OctoPrint server set up and running
  2. Use PrusaSlicer to slice GCode with thumbnails enabled
  3. Modified PrusaSlicerThumbnails plugin installed on Octoprint server
  4. Readable SD card with at least 15kb free inserted in PyPortal
    • For storage of thumbnails - saves a lot of memory thanks to OnDiskBitmap.

Notes

This was only my second or third project using displayio and includes a lot of firsts for me.

  • adafruit_touchscreen Touch display implementation
    • Includes auto-fading touch cursor and inactivity based screen blanking
  • adafruit_displayio_layout layout use via TabLayout
    • Didn't end up using the other three tabs yet, but it was a fun side experiment
  • Fully operational REST API backed displayio display
    • Lots of labels!
  • DIY displayio line graph for temperature history
    • This was fun, only downside is the lack of timeframe selection in the OctoPrint API
    • May look into creating a plugin to provide more controllable temperature history results
  • Experimentation with loading BMP files from the filesystem
    • Thumbnail image downloaded to SD card via PortalBase's wget() then loaded via displayio.OnDiskBitmap()

All of this (so far) fits into memory, although it's been fun to dodge some bullets along the way. Sometimes simply changing a variable has caused pystack exhaustion or memory errors, so regular on-hardware iteration is critical to make sure that new code doesn't cause a problem.

TODO

  1. Test and handle not-connected or no-active-job states
  2. Add capability for retrieval and display of current job's thumbnail Done!
  3. Investigate options to get broader-timeframe temperature history data points
    • Current API only gets the most recent x data points, which only shows the last few minutes... This isn't really all that useful for a small 16-data-point graph.

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