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