--- title: This $40 ESP32-S3 AMOLED map shows where you are without... description: A maker named Gupta built a DIY offline bike GPS using a $40 ESP32-S3 AMOLED board. The device displays maps without any internet connection by pre-baking... canonical: https://daily.dev/posts/this-40-esp32-s3-amoled-map-shows-where-you-are-without-an-internet-connection-vrovm7nls twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: This $40 ESP32-S3 AMOLED map shows where you are without an internet connection | daily.dev og:description: A maker named Gupta built a DIY offline bike GPS using a $40 ESP32-S3 AMOLED board. The device displays maps without any internet connection by pre-baking... og:url: https://daily.dev/posts/this-40-esp32-s3-amoled-map-shows-where-you-are-without-an-internet-connection-vrovm7nls og:image: https://api.daily.dev/og/posts/vRovm7NLs.png og:image:alt: This $40 ESP32-S3 AMOLED map shows where you are without an internet connection 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. # This $40 ESP32-S3 AMOLED map shows where you are without an internet connection **[XDA Developers](https://daily.dev/sources/xda-developers)** · 2 min read · 1 upvotes · 0 comments ## Summary A maker named Gupta built a DIY offline bike GPS using a $40 ESP32-S3 AMOLED board. The device displays maps without any internet connection by pre-baking OpenStreetMap tiles offline, converting them to raw RGB565 format, and storing them on a microSD card in a fixed-grid file. There is no on-device image decoding or per-tile index. GPS integration is still in progress, with the moving dot currently using a hardcoded animation. The source code is not yet released but will be open-sourced once cleaned up. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How can I display offline maps on an ESP32 without decoding images on the device? Pre-bake OpenStreetMap tiles offline using a self-hosted tileserver, convert each 256x256 tile to raw RGB565 format, and pack them into a fixed-grid file stored on a microSD card. This avoids any on-device image decoding or per-tile indexing, letting the ESP32 read raw pixel data directly for fast, fully offline map rendering. _Makers tracking DIY embedded GPS builds like this one can follow project updates on daily.dev._ ## Similar posts on daily.dev - [5 useful ESP32 projects that work perfectly without the internet](https://daily.dev/posts/5-useful-esp32-projects-that-work-perfectly-without-the-internet-jdce1k3dd) · XDA Developers · 0 upvotes · 0 comments - [OpenTrailPaper transforms LILYGO T5 E-Paper S3 Pro devkit into a DIY e‑paper bike computer](https://daily.dev/posts/opentrailpaper-transforms-lilygo-t5-e-paper-s3-pro-devkit-into-a-diy-e-paper-bike-computer-dmvwfxjtz) · CNX Software · 0 upvotes · 0 comments - [This ESP32 e-Ink display keeps track of every country you've ever visited](https://daily.dev/posts/this-esp32-e-ink-display-keeps-track-of-every-country-you-ve-ever-visited-8qkjs4djo) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#iot](https://daily.dev/tags/iot), [#embedded](https://daily.dev/tags/embedded), [#gis](https://daily.dev/tags/gis) [View this post on daily.dev](https://daily.dev/posts/this-40-esp32-s3-amoled-map-shows-where-you-are-without-an-internet-connection-vrovm7nls) ```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":"This $40 ESP32-S3 AMOLED map shows where you are without an internet connection","url":"https://daily.dev/posts/this-40-esp32-s3-amoled-map-shows-where-you-are-without-an-internet-connection-vrovm7nls","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/this-40-esp32-s3-amoled-map-shows-where-you-are-without-an-internet-connection-vrovm7nls"},"datePublished":"2026-07-29T04:09:36.691Z","dateModified":"2026-09-14T08:42:49.733Z","description":"A maker named Gupta built a DIY offline bike GPS using a $40 ESP32-S3 AMOLED board. 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