I designed a PCB business card. It can host an Arduino nano and breaks out all the usual suspects. It connects to an Op Amp, and a FDC1004, a lovely capacitance sensor. It has some power pins as well as SPI, I²C UART and bridges to connect them to 5V or 3.3V. Nothing fancy but useful and to much work to keep it just to myself, Open and what not :)
Also a breakout for SSOP chips in the lower left and some pin hols to get soldering on the card. If you order one opt for the gold finish, it is insane. But expensive!
Here a link to the editor, it is super easy, just change the name to yours and send it to JLCPCB or where ever. Have fun! If anyone does this please let me know, here is no traffic, would be cool!
https://easyeda.com/neuro3en/card
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