Julien Vanier created this OBD-II CAN adapter for the Particle Photon or Electron boards:

CANdlestick

I wanted to make a compact internet-connected analyzer for my car’s OBD-II diagnostic port.

The WiFi-capable Particle Photon or better yet the cellular Particle Electron are great options for that.

Luckily the pins for a Photon fits right in between the 2 rows of pins of a straight OBD-II connector so it’s possible to make a very compact OBD-II adapter with a Photon.

Julien has shared the board on OSH Park:

CANdlestick R1.1