Design decisions behind the Tildagon - a technical walkthrough (emf2026)

A few years back we came up with the concept of a reusable event badge, and built the Tildagon. I'd like to tell you how it came to be, and walk you through the electronic, mechanical, and visual design for 2024 and 2026 and the reasoning behind the various decisions we had to make along the way. We'll go through the schematic, layout, and part selection, and hopefully some of the weirder decisions will make sense. We'll also talk about naming things, off-by-one errors, DHL being awful, and ketchup. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://www.emfcamp.org/schedule/2026/70-design-decisions-behind-the-tildagon-a-technical-walkthrough