Guys, FYI, as the ELM327 cost $32+sh (about $40
) and we use only the CAN properties of it (ISO can be done with the freescale chio, VPW/PWM can be done with transistors or even an ELM320/322), I plan to use a CAN interface made by microchip, their MCP2515 and MCP2551, and use a CAN library to handle messages, and put some logic inside the AVR instead of the ELM's PIC.
This would reduce the cost of the OBDuino to a *duino board, an LCD, and a few components, about $40 all in all.
This is also because on a new prototype board, I think I burnt the CAN input of my ELM327 chip
