Show HN: I made open source, zero power PCB hackathon badges

The Overglade badges are the kind of project that makes you wonder why nobody thought of this sooner — Kai Pereira built hackathon name tags that tap to share info via passive NFC, display everything on e-ink so they sip power like a water bottle at a marathon, and cost under $10 per unit to fab if you're brave enough to hand-solder. The RP2040 chip gives you 4MB of flash and 20 broken-out GPIO pins, which means attendees can actually reprogram their badges after the event instead of throwing them in a drawer, and the custom copper art aesthetic is a low-key flex that makes these genuinely fun to trade. With 43 stars on GitHub and a build guide that makes bulk ordering approachable, this is a solid open-source play that hackathon organizers should be paying attention to.