Business Card. Runs a LPC8N04 NFC microcontroller for transmitting info and flickering LEDs.

Additionally a second coil with 80 turns couples with a transmitter I use at work harvesting the energy to light up some LEDs to give a visual indicator for when the transmitter is running.

Since I also use optical systems on occasion the back side of the board has some passive retro reflectors for IR tracking cameras.

Finally I threw a bottle opener on this thing. I have seen it tried but hope this one works more than a couple times before the board is dead.

I of course waited until the last instance to get this done so I will post results once the board comes in.