Eurolan
GGtag
Program an e-paper badge using sound or USB.
E-paperRFID emulationSound programmingUSB
In stock at Crowd Supply when checked on 2026-09-24.
- Bring along
- A computer or phone for programming; USB or a coin cell.
- Keep in mind
- RFID emulation support does not cover every tag system.
Image credit
Maker product image · Eurolan(02) Blueprint
Build it yourself
rgerganov (designer) and Eurolan (manufacturer) publish the full ggtag schematic, Gerbers, and BOM in their own GitHub repo under GPL-3.0, alongside the firmware.
Design files 3
Research notes
Confirmed via gh api tree + blob fetch (200s). hardware/README.md states verbatim: 'This directory contains schematic diagram, parts list and Gerber files ... entire hardware design is made by Eurolan.' Downloaded and unzipped ggtag-rev10.zip locally: 12 Gerber/drill files for board rev 1.0. pdftotext on the schematic PDF confirms RP2040 as the main MCU. A WebSearch summary of the Crowd Supply page also mentions an ATtiny85 running avrfid for 125 kHz RFID emulation. That is unconfirmed in the schematic text and has no reachable datasheet (microchip.com returned 403, and the Mouser mirror failed), so it is left out of parts.
Every link checked 2026-09-27.
Hand this device to your agent. Everything on this page, as clean Markdown and JSON: specs, shops, prices, design files, parts.
Made the GGtag? Put the badge on your README; it links here, with every shop that sells it.
Specifications
Compute & display
4
Programming & radio
5
No matching specification. Try a chip name, connector or feature.
What still needs checking
- Confirm whether a battery is included in the selected package.
- Some older resource links in the maker page no longer resolve: avrfid firmware. Use the current project repository for maintained downloads.
