Using links below you can download data sheet and quick sheet for ELM327 IC, the schematic diagram, the PCB and component layout if you want to build yourself the OBD diagnostic interface

Schematic diagram for build the CAN BUS interface with ELM 327

PCB for CAN BUS interface with ELM 327

PCB components side for CAN BUS interface using ELM 327

Components layout for ELM 327 CAN BUS interface

If you can't or don't want to build yourself the interface, you can buy the SMD version ( all electronics parts are INSIDE the OBD connector - you don't have any box from your notebook an the car !) on this site.
We also have in stock the ELM327 IC, the MCP2551 CAN controller and the hard to find OBD2 16 pin connector (J1962)