OBD MPGuino gauge

[djarmyssg]

OK I can't seem to get this damn thing working with ELM327 using ISO...... WTF???? Every single PID just acts as if the PID isnt supported!!!! After 3 years I would have figured someone got this thing working!!!!! ANYONE???

[Magister]

For ISO version people used the standalone chip version. The ELM327 should work, problem may come from the line with ATSH6810F1, just remove these lines and try

else if(str[1]=='3') // ISO 9141
elm_command(str, PSTR("ATSH6810F1\r"));

[djarmyssg]

Ok.... Compiled it, and headed out to test here in a couple minutes!

[djarmyssg]

SCORE!!!!!!!!!!! Worked great!!!!! Thats awesome! One final question.... Is there a way to speed up the response time... like how fast the RPM's read???

[Magister]

ISO is a slow protocol at 10400 baud so the speed limitation comes from it...

[djarmyssg]

AHHHH Ok.... I think I can deal with it though! But isnt it actually set to 9600 Baud rate? either way though, Thank you So much man! U rock!

[nickdigger]

If it were 9600, we could use any old serial port or USB to communicate with our cars. So, no, that couldn't be allowed.

[djarmyssg]

Nick, Baud rate is just how fast the information transfers. to communicate to the car you would still need a "Translator" wether its the ELM chip, STN chip, or one of the MC chips.

[njakts]

hey fellas!

I am using ELM327 version.

Testing my obduino I noticed, that it cannot reinit after engine is been turned off...
Actually I dont understand how obduino senses when car is being turned on again.
maybe someone can explain that?

I have the #define SaveTripDataAfterEngineTurnOff part enabled. when I start my engine before obduino is connected to car, everything works fine. I turn off the engine, display says trips saved and backlight goes dim.
when I start the car I can get obduino to work again only by pressing reset or menu button.

another thing, when I turn on ignition and obduino inits before engine is actually started, backlight stays off and obduino wont work untill reset is pressed or menu button is pressed.

I was thinking, what about using one pin and reading ignition on it? like, when pin is high do elm init, when pin is low - save trips.

otherwise this tool is brilliant
any ideas?
thanks

[nickdigger]

Does that happen to other OBDuino owners? Sounds like it gets hung up, because of lost communications with the car. (i only have MPGuino, but plan to add OBD code to it)