Smart Blinking Id Card

About the project

A smart card with I2C NTag interface.

Project info

Difficulty: Easy

Platforms: NXP

Estimated time: 3 days

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

NXP NTAG I2C Plus Flex Antenna NXP NTAG I2C Plus Flex Antenna x 1


This idea of adding NTAG I2C in ID card is my old thought but the time came now to make it for this BadgeLove contest.

There is nothing much in this design. All you need is to get the NTAG I2C antenna and ID card frame (Crystal White). Connect a few SMD LEDs (4 in my case) in parallel between Vout & ground. Use glue gun for wiring and placing led's in the corner.while flashing the card the NTAG gets energized with field and creates voltages across Vout (1 - 3V proportional to distance ) and ground in NTAG I2C, this feeds power to smd leds. Data transfer between the reader and actual ID card creates changes in field which creates blinking effect.

Also the user information will be stored in NTAG , it can be accessed through mobile app (NFC).

The working demo is here:


Photo of ashokr


Hello! I’m Ashok. I’m currently working as software engineer. passionate about doing Hobbies Projects and Animations works.


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