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Aeropic's magnetico-mechanical 7 segment display

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Creation quality: 5.0/5 (2 votes)
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  • 12.5k views
  • 34 likes
  • 136 downloads
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3D design format
PDF, SCAD, and STL Folder details Close
  • 7seg.pdf
  • aeropic_mechanical_7_segments_display.scad
  • axe.stl
  • gear_middle.stl
  • gear_motor.stl
  • gear_side.stl
  • segment.stl
  • sept_segments.stl
  • support.stl

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Publication date 2022-02-02 at 20:29
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Published to Thingiverse on: 2022-01-17 at 22:21
Design number 627374
aeropic

aeropic

3D printer file info

3D model description

This is my attempt to build a mechanical 7 segments display with the following requirements :
- Only one motor to drive one digit
- High visibility
- Small enough
- Nice looking segments with 45° angles at the tips
- Cheap
- Quiet but reproducing as far as possible a clicking noise like vintage flipdots displays
- Able to self-detect its origin as the idea is to build a clock with four of them…

see it working here : https://youtu.be/fM9fBpv1Tc0

The concept is then to get flipping black and white segments motorized only from magnetic fields.
If you place a compass in front of a magnet it will rotate and align itself into the magnetic field. Rotate the magnet the compass will follow.
Here the segments include a small magnet and geared wheels will successively present north/south poles of magnets in front of the segments’ magnets to rotate the segments. One wheel with 10 magnets is rotating in front of one segment. The 7 wheels are all geared and synchronized by the rotation a single cheap stepper motor. A hall sensor will detect the origin. An ESP32 is driving the stepper motor. That is !

3D printing settings

-please read the detailled instructions provided in the 7seg.pdf file

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