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L-ink Card is a smart NFC card with an electronic-ink display built into the card form-factor, aimed at solving everyday pain points of IC cards and giving them a “cooler” interface. The project uses an STM32L0-series microcontroller paired with an ST25DV NFC chip, an e-ink screen, and battery management so the card can display dynamic info while also serving as an NFC tag/card. Its functionality may include showing balance, last transaction, QR codes, or other custom info on the e-ink screen, and interfacing with smartphones or readers via NFC. Because it uses e-ink, the card can display static content with minimal power drain, making it practical for real-world card use. The repository includes board design files, firmware, and supporting software for customizing what the card shows. For hardware hackers and smart-card enthusiasts, it’s a fascinating hybrid of microcontroller, low-power display, and NFC tech in a familiar credit-card size.
Features
- Smart NFC card with ST25DV tag and microcontroller (STM32L051)
- Integrated e-ink display to show dynamic data while maintaining card thickness
- Battery/low-power management optimized for card use
- Complete hardware design (PCB, BOM) and firmware sources
- Customizable display content (balance, QR codes, icons) via software
- Form-factor as standard card for everyday use and hackability
Project Samples
