[equipment] Fit PocketPCR to the robot

• Firmware changes: https://gitlab.com/pipettin-bot/forks/labware/PocketPCR

  • Establish serial connection
  • Implement RPC over ArduinoJSON.
  • Implement program configuration.
  • Implement program start.
  • Implement wait for program.
  • Implement program status.
  • Implement program pause.
  • Implement program stop.

• Software changes:

  • Add a controller using coorder: https://gitlab.com/pipettin-bot/pipettin-coorder
  • Make SVG representation.
  • Define platform properties and slot locations.
  • Define tool properties.
  • Define new high level protocol step
  • Define mid-level protocol action.
  • Define action handler.

• Hardware changes

  • Power with external (non-USB) supply: #211 (comment 1672596456)
    • Avoid destroying the PC's USB port. Test the USB isolator: https://www.thingiverse.com/thing:3044586 https://community.octoprint.org/t/usb-raspberry-pi-isolator/52786
  • Adapt 3d-printed case to the robot's baseplate.

• Documentation:

  • Add link to chatGPT thread: https://chat.openai.com/share/422cf24a-5e63-42f2-95e6-24cc47031472

External power

Not trivial. USB power and comms cannot come from the limited Pi.

Two entry points:

1. Lid temperature pads expose 5V and GND.
2. Capacitor C3 exposes 5V and GND.