Custom OBD interface

rjmink · Post by **rjmink** » Wed Oct 29, 2014 2:58 pm

I'm going to simulate the ELM327 with a custom programmed STM microchip with a bluetooth connection and a CAN interface. What acknowledgements do you need as the connection is made from the LapTimer program to the OBD interface? Do I need to respond to any initialization requests, like the "AT Z" command? Do I have to wait for the LapTImer to request the data or can I just send out the data in the proper OBD format and LapTimer will know what to do with it. Thanks!

Post by **Harry** » Wed Oct 29, 2014 7:43 pm

As long as you use standard LapTimer sensor slots (e.g. ELM327 BT), you need to answer requests just like an ELM327 would. LapTimer has a "receive only" interface too - allowing much higher update rates. This will require customization on the LapTimer side and is not available in the production version currently. Please contact me by email in case you would be willing to provide your solutions to others too.

Harry