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NFC Energy Harvest PCB Business Card

I made myself a PCB business card with NFC tag that tranfers my contact info + powers an 8 bit MCU to blink two LEDs!

msegevmsegev
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I made a PCB business card which powers a microcontroller using NFC. It also transmits my contact info over NFC! Runs an ST25DV64K for NFC and energy harvest, zener diode voltage regulator & an STM8L101F3 low power 8 bit MCU to toggle LEDs. Check out my original reddit post with a GIF showing it in action: https://www.reddit.com/r/electronics/comments/efz9xf/my_nfc_powered_blinky_business_card/

NFC Card Schematic.pdf

Adobe Portable Document Format - 88.81 kB - 01/27/2020 at 03:06

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josh plank wrote 02/07/2025 at 22:37 • point

Awesome project. Could you share any details on how you did the antenna? Looks like its in the PCB.

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msegev wrote 02/07/2025 at 22:54 • point

Yes, it's a PCB trace antenna. ST has good documentation on how to draw it so that it matches the required inductance. There's even a edesignsuite tool that helps. I'm a big fan of ST documentation. https://www.st.com/resource/en/application_note/an2972-how-to-design-an-antenna-for-dynamic-nfc-tags-stmicroelectronics.pdf

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josh plank wrote 02/08/2025 at 00:05 • point

That is convenient! What a thorough document. Nice to have since I know nothing about antenna design. I am thinking of trying both this, and a basic rectification circuit instead of the ST25. It'd be nice if it could just work with a few caps and diodes. I am not sure I know how to program the ST25 if it comes to that.

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marc kerger wrote 03/02/2024 at 13:52 • point

hi, this is quite close to a little project I am trying to make, wondering if you could help me 

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nike9307 wrote 03/27/2020 at 14:39 • point

This is really cool. A bit of an overkill, but really cool. 

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Masitech wrote 02/11/2020 at 21:50 • point

Really cool project. How much power are you able to harvest with the current design? and is the project open source? I wanted to created something like this but with a twist it will save with the layout. 

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