display-auto-rotator

Rotate display automatically!

graph LR
  ACC["Accelaration sensor MMA7361LC"]
  PICO["Raspberry Pi Pico as HID keyboard"]
  PC["PC (Linux)"]
  ACC -->|Analog signal| PICO
  PICO -->|"hotkey to run xrandr"| PC

Demo

See more at https://bsky.app/profile/hyrodium.bsky.social/post/3ln6qdv3mbs2j.

Setup

PC (host)

For example, you can setup the hotkeys like this in KDE Plasma environment.

• Meta+Ctrl+Home: xrandr --output DP-0 --rotate left
• Meta+Ctrl+End: xrandr --output DP-0 --rotate right
• Meta+Ctrl+Up: xrandr --output DP-0 --rotate normal

Microcontroller (Raspi pico unit as HID keyboard)

Buy

• raspberry pi pico
• analog accelaration sensor

Order PCB

Print cover

Print STL files in display-auto-rotator_3dp directory. https://www.thingiverse.com/thing:7035134

Assemble

Write firmware and scripts

• Download and write the CircuitPython firmware (https://circuitpython.org/board/raspberry_pi_pico/).
• Copy the following files to pico drive.
  • CIRCUITPY/lib/adafruit_hid
    • Copy from https://circuitpython.org/libraries.
  • CIRCUITPY/code.py
    • Copy from this repository.
  • CIRCUITPY/boot.py
    • Copy from this repository.