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Old 07-03-2011, 01:32 AM   #1 (permalink)
rs3275
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Join Date: Jul 2011
Location: oregon
Posts: 8

Mustang - '98 FORD MUSTANG COUPE
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clarification on OBDuino with PWM

To start I'd like to say that this opengauge idea is incredible. I always new you could get data off the obd connector (seen it with code readers, laptop readouts in mags, etc) but saw the only well known solution as scangauge. This tool does look nice but it's pretty expensive and no backlight at least from the looks of it. The DIY version should prove more interesting and lower priced.

Vehicle: Ford mustang 1998 coupe
OBD protocol: pretty sure it is J1850 PWM
(existing pins are 2, 4, 5, 7, 10, 13, 16)
Target: working OBDuino setup for data readouts

I've been reading through the documentation but couldn't really find any concrete pinouts for a PWM protocol setup. So far I have this

-freeduino with connections to buttons and transistor
-Interface: ELM320 instead of ELM327 (some searching on forums lead to some posts from advanced members providing this info )

Basically I need confirmation on two things.
-Do I use the ISO pinout or CAN pinout for the LCD connections?
-Is it ok to drive transistor from 5v on freeduino (read in a post that it was low current?) or should I tap into 7805 off of ELM320 OBD interface (pg 16 in datasheet)

EDIT: sorry I wasn't able to add links to info found/used.


Last edited by rs3275; 07-03-2011 at 01:34 AM.. Reason: No pic apology
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