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| author | Sadeep Madurange <sadeep@asciimx.com> | 2025-10-25 15:29:33 +0800 |
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| committer | Sadeep Madurange <sadeep@asciimx.com> | 2025-10-25 15:29:33 +0800 |
| commit | 5066fbedd5b92797ceca9f6841785ee03b362a57 (patch) | |
| tree | 62476f0ea942c370c764c6180c7c31c97f049322 /_projects | |
| parent | 6d80c9b4be3cc4ace918f0546e1238a680116042 (diff) | |
| download | www-5066fbedd5b92797ceca9f6841785ee03b362a57.tar.gz | |
Add post layout.
Diffstat (limited to '_projects')
| -rw-r--r-- | _projects/e-reader.md (renamed from _projects/e-reader/index.md) | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/_projects/e-reader/index.md b/_projects/e-reader.md index 2b907bb..be34473 100644 --- a/_projects/e-reader/index.md +++ b/_projects/e-reader.md @@ -1,8 +1,9 @@ --- title: Prototype e-reader -date: 2023-10-24T00:00:00+08:00 +date: 2023-10-24 author: W. D. Sadeep Madurange thumbnail: thumb.png +layout: post --- This project features a prototype e-reader powered by a 7.5-inch {{< link @@ -10,13 +11,9 @@ src="https://www.waveshare.com/" class="external" target="_blank" rel="noopener noreferrer">}}Waveshare{{< /link >}} e-paper display and an ESP-WROOM-32 development board. -<video style="max-width:100%" controls="" poster=thumb.png> - <source src="ereader.mp4" type="video/mp4"> -</video> +{% include video.html src="ereader.mp4" %} -{{< toc >}} - -## Overview +#### Overview In 2017, during a short stint as a project manager, I was tasked with installing some e-paper displays in a car park. Not knowing how they worked, I @@ -45,7 +42,7 @@ system-on-a-chip with a 160 MHz dual-core processor and integrated WiFi. So, I thought it’d be amusing to embrace the constraints and build my e-reader using just a $5 MCU and the power of C programming. -## The file format +#### The file format The file format dictates the complexity of the embedded software. So, I’ll begin there. The e-reader works by downloading and rendering a rasterized @@ -61,7 +58,7 @@ The enclosed pdftoebm.py script in the tarball at the end of the page converts PDF documents to an EBM file. I use it to make EBM files before uploading them to a web server. -## How does it work? +#### How does it work? As the e-reader has no storage, it can't store books locally. Instead, I first have to upload the EBM file I want to read to a web server. The location of the @@ -81,7 +78,7 @@ I designed the EBM format with HTTP streaming in mind. To download a page based on the current reading progress, the e-reader specifies the page offset and the chunk size using the HTTP Range header. -## Afterword +#### Afterword It's been six years since the car park and the displays. At the time, I knew nothing about embedded systems or display drivers. It took a long time to |