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Blinking Business-card Badge (B3)

Blinking electronic business card with NFC

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Reduce, Reuse, Recycle with this durable business card. Instead of filling landfills with dead trees, you can fill the bits in their contact folder by sharing your VCARD with a simple tap. The logo glows when the tag is read to acknowledge the transaction. There are also holes in the corners so that you can mount it, or wear it if you feel the need to join #badgelife.

This design uses the ST25DV04 to share contact information through NFC.  It takes advantage of the energy harvesting function to light up the logo when the tag is read.  The logo is lit by reverse mounted LEDs shining through the board from the back side.

The easiest way to configure the part is with one of the mobile apps provided by ST on their website.  See the instructions for more details on configuration.

The design is available at Upverter.  All the parts are available from Mouser and you can find links in the bill of material at Octopart.

  • 1 × ST25DV04K-IER6T3 RFID Transponders 4-Kbit Dynamic NFC/RFID tag NFC Forum type V with I2C interface, fast transfer mode and energy harvesting
  • 3 × VLRK31Q1R2-GS08 LEDs and Accessories / Light Emitting Diodes (LEDs), Reverse Gullwing
  • 3 × 2SK3666-2-TB-E JFET, N-ch, SC-59-3, 1.5mA
  • 1 × 0.01uF Capacitor 0.01uF 0402 Capacitor
  • 1 × PRT-14417 Qwiic Connector SparkFun Accessories Qwiic JST Connector- SMD 4-pin

View project log

  • 1
    Assemble Board

    Install all components on the board in the proper orientation.

  • 2
    Get the mobile app to configure the tag

    Follow this link and get the application executable for your platform:

    https://www.st.com/en/nfc/st25dv04k.html#sw-tools-scroll

     STSW-ST25001 for Android or STSW-ST25IOS001 for iOS

  • 3
    Enable energy harvesting

    The default option for energy harvesting is "on demand", so you need to change it to "forced after boot" to get the card to light up whenever it is read.  To do this with the Android app, go to the menu and open "Register Management".  EH_Mode is the third register, change the value to 00 and click the disc in the upper corner to save it to the device.  It will prompt you for the configuration password which is all zeros by default, so just click OK.

View all 4 instructions

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