What is it?

The Stargate Eggbeater is a Persistence of Vision (POV) art project.

sgeb

lpd8808It consists of:

  • A continuos strip of 142 LPD8806 RGB LEDs
  • Each LED is digitally addressable like a monitor pixel
  • 21-bit color depth (2,097,152 colors) per led.
  • Because the Blue LEDs are much brighter than the Red and Green, the strip does not provide a  true 21-bit color palette.
  • The strip has only 4 wires: Power, Ground, Data and Clock

 

 

 

Raspberry Pi Board

  • The LED strips are controlled by Raspberry Pi “B” Board using the SPI bus

 

 

 

 

  • The LED strip is mounted inside a ring/hoop of thick polyethylene tubing in a ring shape 59 inches in diameter.
  • The poly tube-ring is mounted on a rod and bearing.
  • The rod goes through a MOOG slip ring that allows the 4 conductors necessary to power the LED strip. (We actually have 4 or so extra conductors available).
  • The rod is spun by a Bodine 1/4 HP DC Gearmotor, 250 RPM.
  • The base is 28 inches tall
  • Total height is 7.25 feet.

Images are loaded into the Raspberry Pi and a Spherical Persistence of Vision (POV) is created.

The curent videos really do not do the SGEB justice. Perhaps the shutter speed is too slow to properly show the effect. Working on some better videos.

One thought on “What is it?

  1. JB

    ​Hello!

    First of all, I want to say that I am impressed with Stargate Eggbeater you have in your site.

    ​​My son and I are trying to build a large rotating POV cylinder instead of a globe making use of ready-made addressable RGB LED strips. Most of the stuff we found in the web make use of Arduino and similar controllers. They also create their own codes or programs.

    Since we are not that technically competent, we would prefer to make use of our windows-based PC or a Chinese-made T1000 controller (if possible?) for the LED addressable strip (WS28011 w/ 144 RGB LEDs?). We would then try to play video or a series of images to the rotating POV device. I am inclined to use a Raspberry Pi instead of Arduino since I intend to show videos in the POV and make use of more addressable LEDs.

    Is this possible? Could the controller just play one line of pixels of an image in microseconds while it is rotated to produce the desired image? Most of the POV samples in the web are several pixels only while I am thinking of something that is 144 to 288 pixels high.

    Attached is an image of what we are trying to achieve.

    We would appreciate your comments and feedback. I would just want my son to learn from something that seems to interest him.

    Best regards,

    JB Lopez

    Reply

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