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----
-layout: post
-title: Building an ePaper badge
-date: 2025-08-06 19:53 +0200
-lang: en
-categories: tech
----
-
-## Foreword
-
-Two weeks before [{% post_url 2025-07-30-awoostria-con-report %}](Awoostria):
-
-> Hey, I should build something for my Tinkering Projects Show And Tell panel!
-
-So it begins… The story how I built myself an ePaper badge.
-
-Actually, the story begins way earlier, when I still had a physical Raspberry
-Pi running stuff in my home network. I wanted to tinker around a bit and bought
-myself a Waveshare ePaper. These are simple black-and-white displays which
-maintain their content when the power goes off They are also inside eBook
-readers.
-
-Some years ago I wanted to build myself an electronic doorsign for the EAST
-convention with these, and I wanted to go "as minimal as possible". I wanted to
-use one of the MSP430 controllers I had laying around, and I wanted to switch
-motives via MiFare RFID transponders (using an MFRC5xx reader).  Work on that
-development never really took off.
-
-## Requirements
-
-So this time, I simply said "fuck it", and threw an ESP32 on the problem.
-Also, I decided to use [PlatformIO](https://platformio.org/), a
-toolchain/SDK/library manager. I started with the Arduino framework, which is…
-pretty wasteful in terms of resources (Flash/RAM/…), but speeds up development
-significantly.
-
-I had a simple ESP32 devboard, and one of the Waveshare modules, and started
-coding.
-
-…
-
-But wait, what to I even want to achieve? Well, I wanted to "mood badge", i.e.
-show my current mood with funny pictures. I couldn't get one on previous
-conventions, so I was just gonna build one myself.
-
-This involves several sub-problems:
-
-* [Control the ePaper display](#control)
-* [Get the pictures on the display](#pic)
-* [Set what is displayed](#setdisp)
-* [Power-saving](#powersave)
-* [Attach the badge to myself](#attach)
-
-<span id="control"></span>
-## Control the display
-
-Usually, you never talk to the displays themselves, but to a display
-controller. Usually, you talk to these via a digital interface, e.g.
-SPI. There are different display controllers with different command sets.
-
-But why bother with implementing this myself? There are ready-made libraries.
-For myself, I decided to use [GxEPD2](https://github.com/ZinggJM/GxEPD2).
-They support *some* Waveshare displays. The problem with Waveshare displays is,
-they don't disclose which display controller they use. So it's kind of an
-trial-or-error procedure. Or rather, you can look at their example code,
-figure out which commands they are using, and compare what commands
-GxEPD2 uses. That's a but cumbersome.
-
-<span id="pic"></span>
-## Get the picture on the display
-
-You can't just simply throw a jpeg onto the display.  a) The display doesn't
-understand that. It only understands pixel data.  (the library doesn't,
-either).  b) The display can only draw black and white pixels.
-
-So, you definitely can't throw a color picture on the display, not a monochrome
-one. There are displays which support a few gray-levels, though.
-
-So. What to? The solution is "dithering". I.e. you trick your eye into
-perceiving grey by having clusters of black and white pixels. There is some
-background to dithering, but I simply used either GIMP, the Floyd-something
-algorithm, or one of the "ordered" modes of ImageMagick.
-
-This, then, looks like this:
-
-<img
-  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"
-  alt="a dithered image of my fursona"
-/>
-
-
-TODO: XBM
-
-<span id="attach"></span>
-## How to attach the badge to myself
-
-This would be cumbersome. I had a Waveshare module/PiHat (to heavy), and a
-simple "ePaper sheet" - which would be too cumbersome to attach to the
-devboard. So, at this point, I decided to switch from the prototyping platform
-onto something better.
-
-Fortunately, Elecrow provides a
-[CrowPanel](https://www.elecrow.com/crowpanel-esp32-2-9-e-paper-hmi-display-with-128-296-resolution-black-white-color-driven-by-spi-interface.html),
-which is exactly what I need. It has a display, a built-in ESP32, a housing,
-and even some switches! 
-
-I decided to glue magnets onto the housing, and attach the display
-via magnets on the inner side of my shirt - not ideal. I positioned the 
-magnets in the (vertical) middle of the housing, so it wobbles and is not 
-readable. Also, I accidentally washed the shirt after Awoostria with the magnets
-still sticking inside - and now there's a hole in it. :(
-
-<span id="setdisp"></span>
-## Set what is displayed
-
-In addition to these controls, which allow choosing the motive, I wanted
-something "more direct", so I added the
-[NimBLE-Arduino](https://github.com/h2zero/NimBLE-Arduino) library. With a bit
-of coding, the available presets/motives could be read via BLE,
-and also one could be selected via another characteristic.
-
-Actually, the switch-selection was a but troublesome.
-Redrawing the whole display takes around 2 seconds - but that is
-not acceptable when navigating the presets one-by-one.
-By looking at the API, I found out you can select a "partial region".
-
-What I didn't mention yet, the text that shows the mood is drawn using
-the API - not integrated into the picture. So, I simply update a
-region in the vertical-center-right of the display with the mood text.
-The selection is confirmed my pressing the rotary switch.
-
-This is still not ideal. The first update must be a full-one,
-and I don't save the selected preset in NVS - I don't want to destroy
-the flash by hundreds/thousands of write cycles. I don't have a solution
-to this, yet. Maybe I'm gonna integrate an microSD card (there's a slot for that!).
-Gonna research a good wear-levelling file system for that. Probably not FAT. That doesn't
-need to be readable on the PC. (And even if, simple stuff can be written in FUSE). 
-
-<span id="powersave"></span>
-## Power saving
-
-I first measured the current and was shocked. The whole thing
-draws around 80-100 mA. Not a big surprise, given that Arduino
-basically calls `loop()` over and over again.
-
-Using a bit of experimenting, and failing to cancel light sleep with
-an GPIO interrupt, I  implemented power saving by using a timer-based
-light sleep (10 ms, gives good user response) and reducing the CPU frquency to
-TODO????? MHz.
-
-And lo and behold, my USB current measuring equipment (resolution 10mA) showed 0 mA. Success.
-
-Actually, reducing the CPU frequency was a requirement! If I didn't do that,
-the CPU would constantly crash when entering or exiting light sleep. No idea why!
-
-## Resources
-
-bla on dithering bla.
-