--- title: Switch Mod Fixes Fiddly Car Door Projector | daily.dev description: A Citroën owner documented how they fixed a door-mounted logo projector whose Hall effect sensor kept losing its magnet, causing the projector to stop working.... canonical: https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Switch Mod Fixes Fiddly Car Door Projector | daily.dev og:description: A Citroën owner documented how they fixed a door-mounted logo projector whose Hall effect sensor kept losing its magnet, causing the projector to stop working.... og:url: https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8 og:image: https://api.daily.dev/og/posts/Ry4suhmD8.png og:image:alt: Switch Mod Fixes Fiddly Car Door Projector og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Switch Mod Fixes Fiddly Car Door Projector **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A Citroën owner documented how they fixed a door-mounted logo projector whose Hall effect sensor kept losing its magnet, causing the projector to stop working. The fix involved reverse-engineering the circuit, removing the Hall effect sensor, and replacing it with a simple mechanical button that contacts the door frame when opened. The teardown also revealed an 8-pin microcontroller apparently used only to poll the sensor and switch a transistor powering the LED, which seems like overkill for such a simple task. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Making A Hidden Door Status Sensor](https://daily.dev/posts/making-a-hidden-door-status-sensor-pnbais5rb) · Hackaday · 0 upvotes · 0 comments - [Someone built a $10 ESP32 smart garage door opener that works with Home Assistant](https://daily.dev/posts/someone-built-a-10-esp32-smart-garage-door-opener-that-works-with-home-assistant-ohikudqvi) · XDA Developers · 2 upvotes · 0 comments - [How I fixed an electricity issue in my car](https://daily.dev/posts/how-i-fixed-an-electricity-issue-in-my-car-qdzzmylsl) · RUBYLAND · 0 upvotes · 0 comments --- Tags: [#embedded](https://daily.dev/tags/embedded) [View this post on daily.dev](https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Switch Mod Fixes Fiddly Car Door Projector","url":"https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8"},"datePublished":"2026-09-03T05:09:10.135Z","dateModified":"2026-09-03T05:22:19.715Z","description":"A Citroën owner documented how they fixed a door-mounted logo projector whose Hall effect sensor kept losing its magnet, causing the projector to stop working....","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5b092e70749199613dbe849a7879b420?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5b092e70749199613dbe849a7879b420?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/switch-mod-fixes-fiddly-car-door-projector-ry4suhmd8","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"embedded","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"Switch Mod Fixes Fiddly Car Door Projector"}]} ```