https://github.com/jana-marie/ligra
an open source image projector build from scratch and based off of flea market parts.
https://github.com/jana-marie/ligra
electronics kicad light oshw projector
Last synced: 8 months ago
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an open source image projector build from scratch and based off of flea market parts.
- Host: GitHub
- URL: https://github.com/jana-marie/ligra
- Owner: Jana-Marie
- License: cern-ohl-s-2.0
- Created: 2024-06-01T15:53:16.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-01-04T13:18:09.000Z (10 months ago)
- Last Synced: 2025-01-18T03:31:39.902Z (10 months ago)
- Topics: electronics, kicad, light, oshw, projector
- Language: OpenSCAD
- Homepage:
- Size: 84 MB
- Stars: 204
- Watchers: 14
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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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!
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 ...]
## [Instructions](https://github.com/Jana-Marie/ligra/blob/main/instructions.md)
(Want to build one? ^ click me)
## [Projection-Media](https://github.com/Jana-Marie/ligra/blob/main/projection-media.md)
(You have one and need stencils? ^ click me)
## [Staging-Stages](https://github.com/Jana-Marie/ligra/blob/main/staging-stages.md)
(You have one and want to work on a different stage, a different way of adding media for projection? ^ click me)
## Todo
- [ ] Add assembly instructions (85% done)
- [ ] Refine by adding real images (45% done)
- [ ] Add 3D print instructions (5% done)
- [ ] Add BOM (0% done)
- [ ] Add drawings (60% done)
- [x] Make projection-media page more expressive
- [x] Design more stages
- [x] Cleanup OpenSCAD file