NFC Badge/Keychain (Kazuma Konosuba)

Project for the Celebrate Childhood with a Colorful PCB event

Small NFC badge featuring Kazuma, the main character of the anime KONOSUBA!

There's a small loop at the top of the board so it can be used as a slightly oversize keychain

On the back side of the board there's a NT3H2211 IC with just a couple of required passive components, the NFC antenna is also on the bottom layer.

R1 is a 0 ohm resistor or solder blob to bridge VCC and VOUT, C2 and C3 are spaces for tuning capacitors, they are not strictly required and can be left unpopulated if you don't want to fine-tune the antenna.

Finally there are some pads where it's possible to solder a 2.54mm header and talk to the chip directly via its I2C interface, useful for some extra thinkering/debugging.