Firefly Gremlin: Hardware

The hardware design, schematics and PCB layouts for the Firefly Gremlin Hardware Wallet for Ethereum (and ilk).

• Firmware
• Case

See the CHANGELOG for high-level changes between board revisions.

Tech Specs

• Processor: ESP32-C3 (32-bit RISC-V)
• Speed: 160Mhz
• Memory: 400kb RAM, 16Mb Flash, 4kb eFuse
• Inputs: 4 direction d-pad and 4 buttons
• Outputs:
  • 240x240px IPS 1.3" display (16-bit color; RGB565)
• Conectivity:
  • USB-C (power + JTAG/CDC-ACM)
  • BLE

Contributing

• To modify the files, use KiCad (open-source EDA application)
• Since the git diff involved in modifying these files is somewhat opaque, please start a discussion first, so any changes can be coordinated

Photos

See the output folder for rendered schematics, PCBs and 3D renders along with photos of the various revisions.

License

MIT License.