BigTape

This is the archive for code used for the project BigTape installed in PingShan Art Museum.

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update: I uploaded a video here: https://www.youtube.com/watch?v=SyM3ul_wpzs

Highlights

• Running on three ESP32 modules with MicroPython, and communicate through HTTP on the local network.
  • See specs here
• Async PID control based on position with MicroPython simple-pid
• Absolute Rotatory Encoder through RS485 and ModBus RTU Serial with MicroPython Modbus library
  • See specs of the absolute encoder here
  • In the actual project, a LoRa Transmission Module is used for remote communication in RS485 and Modbus RTU Serial. See specs here.
• DC Motors driven by H-Bridge with PWM.
  • See specs for the H-Bridge here
• Dynamically setting PID position through HTTP server with MicroDot
• Triggerable by human movement based on Xiaomi Human Body sensor

Notes for Reproduction

• Most of the third-party modules used in this project has been "frozen" into the firmware:
  • PID
  • umodbus
  • copy
  • urequests
  • microdot_asyncio
• Just for reference, utility.py contains some deprecated code from the unsuccessful usage of incremental rotatory encoder as the ESP32 used in this project fails to register every steps.
• The repo has been substantially purged for succinctness with only the working code left, which might lead to confusion should there be any mistakes. If necessary, open an issue.