This design was done in Upverter, so you can modify it in your browser without installing any software:
Please note that this project uses an MCU that is only available in a fine pitch QFN which is not trivial to assemble. The previous B3 Blinking Business card Badge uses NFC EEPROM which are available in larger packages that are more friendly for beginners.
I'll post the source code once I get a chance to clean it up a bit.
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