New PCBs from JLCPCB - Arduino Playboard
JLCPCB Prototype for $2(Any Color): https://jlcpcb.com
A PCB design concept. Standard Arduino modules can be pushed into the board (possibly without even soldering) to create a finished design. A sketch is uploaded and the device 'just works'.
PCB design and Arduino sketch are here:
https://easyeda.com/julian256/Nano-Playboard