Full Color Dot Matrix Display Zoetrope
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This 3D zoetrope shows arbitrary 20x5 pixel full color bitmap. You need ESP32 microcomputer (normal Arduino is not…
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This 3D zoetrope shows arbitrary 20x5 pixel full color bitmap.
You need
- ESP32 microcomputer (normal Arduino is not compatible because multi thread programming is used)
- 120mm PC fan (Zoetrope is not mechanically coupled but driven by the air flow)
- 20cm (12 pixels) WS2812B Neopixel serial LED array (60 pixels / m)
- Rohm RPR-220 reflective photosensor
- paints
Update Dec. 13, 2021 : Actually, the rotor (main rotating part) is driven bynot axial but rotating (twisting) airflow from the PC fan. Therefore, I have added an another rotor (rotor2.stl) that has not propeller-shaped but vertical vanes.
I also added a zip file (for-small-printers.zip) that has divided inner and outer rotors. Please divide the outer rotor into two or four parts that fit to your printer's building table.
Update Dec. 18, 2021 : To suppress the staggering of rotor, I have added "tight-axis.stl". it reduces the tolerance around the axis to reduce the undemanded motion of the rotor. If the axis is too tight, please adjust the size of the axis part by slightly changing the size of it with your slicer.
I also added nap-clock.ino which acquires current time via WiFi and ntp.
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How to make
- Print all parts. No supports needed.
- Paint the balls of zoetrope rotor.
- Insert Neopixel LED array to the LED holder.
- Set PC fan to the base.
- Stick cone shaped axis to the stationery part of PC fan.
- Set photosensor. Wiring is as follows.
- Place rotor on the axis. Use silicone grease on the top of the axis.
- Power on. Tune the rotation speed of the rotor by attaching some cardboard to decrease the air flow. Ideal rotation speed is around 150RPM (2.5 revolution per second), but of course, the LED is automatically synced by measuring the rotation speed and origin of the rotor.
The USB powered PC fan is isolated from the others mechanically and electronically. The rotor is driven by the airflow from the PC fan. The origin and rotation speed is sensed by the photo sensor.
Category: Gadgets