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Reminders for the AI Assistant

  • This is a platformio project
  • The simulator is a binary that opens its own window and simulates the display
    • You don't need a browser or VNC to access it
    • It's not a web app
    • If I ask you to take a screenshot, use simulator/screenshot.sh
  • After every change, rebuild the project and the simulator

Ideas

  1. Enrich the info on the display with information from Spoolman server Done!
    • optional, only when spoolman url and wifi is configured
    • wifi must be enabled if spoolman url is configured (atm it's only activated when a webhook is configured)
    • only when spool_id is set
    • show remaining and total weight
    • show filament name
  2. Create 3D printable case for the device in OpenSCAD Postponed!
    • RFID reader at the back of the display
    • must encase both screen and reader in a minimal way
    • reader must be accessible for NFC tags
    • touchscreen must be accessible
    • must be printable with no or minimal supports
    • unavoidable supports must be builtin and easy to remove
    • usbc must be accessible, all other connectors must be covered
    • both boards must be mountable
  3. Edit / Create tags Version 1 Done!
    • when a tag is scanned, show an edit button
    • when edit is pressed, show an edit screen
    • on edit screen, show the current values
    • allow editing of all values
    • allow saving the tag
    • allow cancelling the edit
    • on save, ask user to present tag and write to it
    • on cancel, go back to info screen
    • on idle screen, show a button to create a new tag
    • for selects use same values as PrintTag-web
      • source: /home/dilli/src/PrintTag-Web
      • additional brands: "Das Filament" and "RecyclingFabrik"
    • open question: How to handle Custom Brand names, is there a onscreen keyboard widget or something like that in lvgl?
  4. Snapmaker U1 Extended Firmware support Done!
  5. Support Snapmaker Proprietary tags
    • Complexity: High.
    • Official Snapmaker tags on spools use Mifare Classic 1K tags (ISO14443A)
    • Proprietary encrypted format with RSA signatures (hard to write, but readable)
    • Sector keys are derived per-tag via HKDF-SHA256 from a master salt key and tag UID
    • Would require:
      • ESP32 crypto library (SHA256/HKDF)
      • Master Salt Key (from firmware or user)
      • Mifare Classic authentication and multi-sector reading logic
      • Binary data parsing to map fields
  6. Battery Power
    • add a rechargeable battery
    • footprint must be small and fit to the board
      • either between display and reader
      • or to one of the sides of the board
    • must be rechargeable via usb-c
    • capacity must be big enough to last for at least 1h of constant use including wifi
    • research results
      • estimated Total Average Draw: ~300–350 mA
      • 1000 mAh LiPo battery provide ~3 hours of constant use
      • A "503450" cell is approx. 34 x 50 x 5mm
    • Deep Sleep vs Power Off
      • Software-only power off is not possible (hardware lacks a load switch).
      • Deep Sleep is the primary power-saving mode.
      • Estimated Deep Sleep draw: 1-5mA (due to LDO and peripherals).
      • Standby path (1000mAh): ~8 to 40 days depending on board revision.
      • Recommendation: Physical slide switch for long-term storage.
  7. List spools and select spools available in spoolman Done!
    • instead of scanning a tag, show a list of spools available in spoolman
      • new button on scan screen above the create button
      • only visible when spoolman is configured
    • new list screen
      • per row show
        • Color swatch
        • Brand
        • Material
        • Filament Name
      • title: "Select Spool"
      • paginated list
        • items per page yet to be determined
        • "Previous" and "Next" (chevrons) buttons at bottom
        • show page number / total pages between buttons
      • "Cancel" button below list
      • main layout similar to edit screen (Caption, main area, button area)
    • when a spool is selected, load it as if the tag was scanned
    • allows to load spools to the printer that are in spoolman but don't have a tag
    • allows to create new tags for spools that are in spoolman but don't have a tag
    • would make the spool id dialog and prefill for creating tags obsolete
  8. Configurable Battery behavior
    • let the user configure the behavior of the power management, options:
      • always on (display timeout still applies but no deep sleep)
      • deep sleep when idle for X minutes
      • always on when usb is connected, deep sleep when idle for X minutes when on battery
    • default: deep sleep when idle for X minutes
    • X should be configurable, default 5 minutes, min 1 minute, max 60 minutes
    • X must be at least as long as the display sleep timeout
    • change option for the display timeout to be optional for a full "always on" experience

Known issues

  • When the display goes to sleep for the first time, it does wake on touch but turns off again after about a second. On subsequent behaves the same. Fixed!
  • Ugly bars at edges of the logo on the idle screen Fixed!
  • canceling the tool selection dialog does not go back to the info screen Fixed!
  • on the device I have configured tools to be 4, but the tool selection dialog shows only 1 tool. I have tried to reset the device, but it does not help. Fixed!
  • Spool selection from Spoolman
    • chevron icons are broken, probably buttons use incorrect font (same bug as with select boxes earlier) Fixed!
    • dont show weight info in the list, it's not needed there and uses too much space. Use that space for the label instead. Fixed!
    • The list entries should have at most 2 lines of text. Cut off the overlapping text. We tried to fix this earlier but the issues persisted. Fixed!
    • The area with the prev/next buttons and page numbers overlaps the spool list Fixed!
    • The total number of pages is wrong, it's allows shown as 1. So on the third page it says "Page 3/1". Fixed!
    • On the first page the prev button should be disabled. On the last page the next button should be disabled Fixed!
    • on the scan screen, placing the new button above the create button was not a good idea. Put both buttons side by side at the bottom and label them "Spoolman" and "New". Fixed!
    • the screenshot shows the spool data screen instead of the spool list screen. Fixed!
    • the last few pixels of the bottom entry of the list is cut off. Fixed!
  • Sometimes fetching data from spoolman takes a moment. When a tag is scanned, the device should show a "Fetching data from spoolman" message. When the data is fetched, the device should show the info screen.
  • When a color from spoolman has an alpha value, the color is displayed as "Unknown". We need to come up with a way to handle alpha values. They should not get lost but also don't break other things like loading a spool to the printer or writing valid tags. Fixed!

Fixes for Edit / Create tag

  • keyboard cant be closed once it's open Fixed!
  • spool id should have a numeric keyboard Fixed!
  • I don't like the color swatches. But I want a preview of the color entered in the hex field Fixed!
  • Longshot: What would it take to get a colorwheel widget in lvgl? Is a downgrade to LVGL 8.x worth it? What would be the downsides? Won't Do!
  • when entering a color, I don't want to enter the # sign. It should be cut off before editing and added back after editing. Put a # left of the input to make this more clear. if possible the keyboard should open in a hex mode Fixed!
  • we need to validate the inputs before allowing to save. Invalid data should be red. At the moment I can put anything in e.g. the color field and it will be saved. This is not what I want. Fixed!

Prepared prompts

Todo

  • Implement Mifare Classic authentication for PN5180 (to enable Snapmaker tag support for PN5180 users).