Cylindrical Dot Matrix Display / Marble Elevator

** This is a mechanical dot matrix display controlled by a single stepper motor.**

Download all files from the following link,
https://www.thingiverse.com/thing:5154001/zip

- It can show an arbitrary bitmap of 5x24 or 12x24 resolution, mechanically
- Perfect cylindrical shape
- All contents are scrolled up
- Used marbles (airsoft BB pellets) are automatically collected and reused
- Single motor control. The motor not only elevates but also arranges ON pixels
- Theoretically Scalable. Two types (tall and short) are provided.
- It keeps displayed contents even if the power black out or detach from the motor

** Sample Codes **

- Simple test codes (turn on all pixels, or checkerboard pattern)
- Showing fixed bitmap demo
- Showing text demo (with simple font data)
- (ESP32 only) Showing current day and date acquired through WiFi
- (ESP32 only) Showing next agenda, synced with Google Calendar