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  • Author Author: dwinhold
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PiCasso Design Challenge : POV Globe Blog #1

dwinhold

Hello Community,

 

Here is the introduction to my project POV Globe. I have been fastenated for years with Persistence of Vision (POV). I have created POV wands for my kids, but I have always wanted to create a globe. I want to go into great depths with this, starting with making it colour. The extent of what graphics I create will depend on the time alloted. I do promise not to disappoint!!

 

POV Globe

Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye.

 

LED POV displays

The term "persistence of vision display" or "POV display" has been used for LED display devices that compose images by displaying one spatial portion at a time in rapid succession (for  example, one column of pixels every few milliseconds). Simplified, each LED light turns on and off in a specific pattern to spell out words or create a picture when waved at a specific speed. A two-dimensional POV display is often accomplished by means of rapidly moving a single row of LEDs along a linear or circular path. The effect is that the image is perceived as a whole by the viewer as long as the entire path is completed during the visual persistence time of the human eye. A further effect is often to give the illusion of the image floating in mid-air. A three-dimensional POV display is often constructed using a 2D grid of LEDs which is swept or rotated through a volume. The 3D display is what I will be creating.

 

Project outline

  1. Create the ring for the globe to be based from. The ring will be 300mm in diameter.
  2. Make the base with the motor to rotate the ring. The speed will have to be around 600 RPM. For the eye to think it as a single image it will have to rotate 10 times per second.
  3. Add the LED lights and wire them. They will be RGB.
  4. Attach the Raspberry Pi and hook-up power and test.
  5. Lots and lots of programming and testing.
  6. Figure out what went wrong.
  7. Fix any issues.
  8. Lose temper while fixing issues.
  9. Solve all the issues.
  10. Present the finished project!!

 

Sketch of project

 

image

Thank you for reading, please follow mine as well as the other competitors projects. They are going to be great!!!

 

Dale Winhold