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Jana-Marie / ligra Public

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an open source image projector build from scratch and based off of
flea market parts.

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Jana-Marie/ligra

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  * README

ligra

 

ligra is an open source image projector build from scratch and based
off of flea market parts. ligra is not neccessarily a PCB-project nor
a single thing, but rather an idea of how to design your own
image-projection system. It is an introduction on how to create
light-grafittis, how to share messages at large.

It's not strictly a Gobo, rather a way of building a system that may
resemble one, but may also resemble a video projector or an abstract
source of art. I have mostly used it with 2D printed stencils,
usually used with so called "overhead projectors", one can of course
also use metal-stencils, coloured effect-foils, 3D printed stencils
and even LCDs, or really anything that may project an image. Get
creative!

[signal-202] [signal-202]

This repo is very WIP and shall be expanded soon :3

Working principle

 

ligra essentially functions as a backwards camera, well, most
projectors do. This becomes more visible when we talk about its inner
workings, it's heart and most fixed element is the lens, a Canon FD
lens in our case. But instead of using it to project and image onto a
35mm film slide, we will project light through a ruffly 35mm film
slide-sized, image forming medium (i.e. a 2D printed stencil). This
light will enter the lens from the back, projecting an image onto a
scene with the properties of the lens (focal length, aperture and
focus). Given the quality of even early lenses, we can expect some
sharp and crisp projections. [WIP ...]

Todo

 

  * [ ] Add assembly instructions
  * [ ] Add 3D print instructions
  * [ ] Add BOM
  * [ ] Add drawings
  * [ ] Cleanup OpenSCAD file

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an open source image projector build from scratch and based off of
flea market parts.

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light projector kicad oshw

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