All-in-one USB to isolated-UARTx2/CAN/USB/RS485/RS232 converter

Dec 28, 2020

Project update 4 of 11

Ollie DB9 to OBD-II Cable Support

by Ali Slim

The DB9 connector did not get much attention, although it’s a very useful tool! So now I’ve decided to make it even more useful by adding support for OBD-II Cable.

Many CAN interfaces use DB9 (9 pin D-Sub) including Ollie. To be able to connect to your car you will need a DB9 to OBD-II Cable. OBD-II connector allows you to connect to large variety of vehicles.

The current Ollie DB9 pinout is based on CiA 303-1 which specifies DB9 pinout as (CANL pin2, CANH pin7 and GND pin3) however I found that although CiA to OBD-II cables do exist but are not very common, the only one I could find was on Mouser OBD-DB9-F-ES.

The more common cables are the Sparkfun DB9 to OBD-II with pinout (CANL pin5, CANH pin3 and GND pin1).

This is why I decided to add 3 extra jumpers to support both modes. So all backers who ordered the DB9 connector will receive the updated version at no extra cost!

Sign up to receive future updates for Ollie.

Subscribe to the Crowd Supply newsletter, highlighting the latest creators and projects