Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Any interest in developing an open source fuel economy gauge/computer?

LostCause · 05-21-2008, 05:40 AM

Great work on developing the fuel gauge. Since Mark I is the basic VSS/injector MPG method, I suspect Mark II will use the OBDII protocol.

If that is the case, here is a resource that shows circuits for converting OBDII to serial. Also, the basic coding structure of all the OBDII interfaces is shown. This is above my head, but hopefully not above others.

EDIT: Probably the cheapest interface chip for OBDII -> RS232. It covers all the old protocols (ISO 9141, PWM J1850, etc.) and the new CAN bus.

- LostCause

05-21-2008, 05:40 AM	#156 (permalink)
LostCause Liberti Join Date: Feb 2008 Location: California Posts: 504 Thunderbird - '96 Ford Thunderbird 90 day: 27.75 mpg (US) Thanks: 0 Thanked 7 Times in 7 Posts	Great work on developing the fuel gauge. Since Mark I is the basic VSS/injector MPG method, I suspect Mark II will use the OBDII protocol. If that is the case, here is a resource that shows circuits for converting OBDII to serial. Also, the basic coding structure of all the OBDII interfaces is shown. This is above my head, but hopefully not above others. EDIT: Probably the cheapest interface chip for OBDII -> RS232. It covers all the old protocols (ISO 9141, PWM J1850, etc.) and the new CAN bus. - LostCause Last edited by LostCause; 05-21-2008 at 06:25 AM..