{"id":19227042,"url":"https://github.com/jana-marie/ligra","last_synced_at":"2026-01-28T15:06:45.299Z","repository":{"id":242248046,"uuid":"809071780","full_name":"Jana-Marie/ligra","owner":"Jana-Marie","description":"an open source image projector build from scratch and based off of flea market parts.","archived":false,"fork":false,"pushed_at":"2025-04-08T14:56:05.000Z","size":88094,"stargazers_count":209,"open_issues_count":0,"forks_count":3,"subscribers_count":14,"default_branch":"main","last_synced_at":"2025-09-27T21:31:48.980Z","etag":null,"topics":["electronics","kicad","light","oshw","projector"],"latest_commit_sha":null,"homepage":"","language":"OpenSCAD","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"cern-ohl-s-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/Jana-Marie.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":".github/FUNDING.yml","license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null},"funding":{"github":"Jana-Marie"}},"created_at":"2024-06-01T15:53:16.000Z","updated_at":"2025-09-02T09:07:36.000Z","dependencies_parsed_at":"2025-09-27T21:41:51.090Z","dependency_job_id":null,"html_url":"https://github.com/Jana-Marie/ligra","commit_stats":null,"previous_names":["jana-marie/ligra"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/Jana-Marie/ligra","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Jana-Marie%2Fligra","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Jana-Marie%2Fligra/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Jana-Marie%2Fligra/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Jana-Marie%2Fligra/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/Jana-Marie","download_url":"https://codeload.github.com/Jana-Marie/ligra/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Jana-Marie%2Fligra/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28846116,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-28T13:02:32.985Z","status":"ssl_error","status_checked_at":"2026-01-28T13:02:04.945Z","response_time":57,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.6:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["electronics","kicad","light","oshw","projector"],"created_at":"2024-11-09T15:21:32.804Z","updated_at":"2026-01-28T15:06:45.283Z","avatar_url":"https://github.com/Jana-Marie.png","language":"OpenSCAD","funding_links":["https://github.com/sponsors/Jana-Marie"],"categories":[],"sub_categories":[],"readme":"# ligra\n\nligra 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.\n\nIt'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! \n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\n        \u003cimg src=\"images/signal-2024-06-01-161329_003.jpeg\"/\u003e\n      \u003c/td\u003e\n      \u003ctd\u003e\n        \u003cimg src=\"images/signal-2024-06-01-161329_004.jpeg\"/\u003e\n      \u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003ctd colspan=\"2\"\u003e\n        \u003cimg src=\"images/e5e7f5f40d520a76.jpg\"/\u003e\n      \u003c/td\u003e\n    \u003c/tr\u003e\n  \u003c/tbody\u003e\n\u003c/table\u003e\n\n\n\nThis repo is very WIP and shall be expanded soon :3\n\n## Working principle\n\nligra 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 ...]\n\n## [Instructions](https://github.com/Jana-Marie/ligra/blob/main/instructions.md)\n\n(Want to build one? ^ click me)\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\n        \u003cimg height=\"220\" src=\"images/drawing.jpg\"/\u003e\n      \u003c/td\u003e\n    \u003c/tr\u003e\n  \u003c/tbody\u003e\n\u003c/table\u003e\n\n## [Projection-Media](https://github.com/Jana-Marie/ligra/blob/main/projection-media.md)\n\n(You have one and need stencils? ^ click me)\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\n        \u003cimg height=\"220\" src=\"images/signal-2024-06-15-020726_002.jpeg\"/\u003e\n      \u003c/td\u003e\n      \u003ctd\u003e\n        \u003cimg height=\"220\" src=\"images/0b2d5d8d6d914120.jpg\"/\u003e\n      \u003c/td\u003e\n      \u003ctd\u003e\n        \u003cimg height=\"220\" src=\"images/da240891a95fc2dd.jpg\"/\u003e\n      \u003c/td\u003e\n    \u003c/tr\u003e\n  \u003c/tbody\u003e\n\u003c/table\u003e\n\n\n## [Staging-Stages](https://github.com/Jana-Marie/ligra/blob/main/staging-stages.md)\n\n(You have one and want to work on a different stage, a different way of adding media for projection? ^ click me)\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\n        \u003cimg src=\"images/IMG_1345.jpg\"/\u003e\n      \u003c/td\u003e\n      \u003ctd\u003e\n        \u003cimg src=\"images/Screenshot from 2025-01-04 12-20-47.png\"/\u003e\n      \u003c/td\u003e\n      \u003ctd\u003e\n        \u003cimg src=\"images/Screenshot from 2025-01-04 12-24-28.png\"/\u003e\n      \u003c/td\u003e\n    \u003c/tr\u003e\n  \u003c/tbody\u003e\n\u003c/table\u003e\n\n## Todo\n\n- [ ] Add assembly instructions (85% done)\n  - [ ] Refine by adding real images (45% done)\n- [ ] Add 3D print instructions (5% done)\n- [ ] Add BOM (0% done)\n- [ ] Add drawings (60% done)\n- [x] Make projection-media page more expressive\n- [x] Design more stages\n- [x] Cleanup OpenSCAD file\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjana-marie%2Fligra","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjana-marie%2Fligra","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjana-marie%2Fligra/lists"}