OBD MPGuino gauge

[Magister]

Seems a problem with the mac version, report it to theArduino forum I guess.

[CranberrySauce]

Well, I'm compiling to the Sanguino. I also presume that Justin K is using Windows, but I'll try to compile it on my Linux box...

[dcb]

The sanguino is not supported here. Please refer any sanguino questions to the place of purchase.

[CranberrySauce]

Originally Posted by dcb

The sanguino is not supported here. Please refer any sanguino questions to the place of purchase.

Honestly, all that I'm doing is updating the code's outdated library references and a-standard EEPROM loading and saving to stuff that's more Arduino standard. (check this out) This way it's actually maintainable.

[dcb]

The sanguino is non-standard, even in arduino terms. You cannot use arduino standard and sanguino rightfully in the same sentence. I don't see any rationale for wasting peoples time with it here. Why not use a 168 which works, and not make self inflicted problems? If the 644 works, great, if not, what is the problem with asking the sanguino people? I don't think the folks working on this have time to chase their tails.

This isn't a pure development board, it has fuel efficiency feedback primary task, and it has already started to move away from arduino as a development environment because it tends to "get in the way" when trying to write a serious application, and creates too many distractions (i.e. unnecessary version dependencies and breakage and random CPU upgrade and support expectations).

I don't want to see this project turn into a "let's use an SUV sized chip because it would be so cool" type venture. You should really present an extremely good rationalle for introducing and expecting support for such a large deviation from the already working hardware. Othwerwise Arduino.cc or wherever the sanguino is officially supported is where you should start, instead of hijacking a project that is this far along.

[electromike]

Hi, I have just attempted to calibrate the tank with the first fill up and want to make sure I got the math right.
The OBDuino said I used 38.54 Liters
Filling up I actually only used 33.109 Liters
The OBDuino had a setting of 85% V.E.

What should the new calibrated value be at? 73%?

Thanks for the help!

I assume the fromula should be this:

New V.E.% = (Actual Fuel Used * Current V.E.%) / ( OBDuino Reported Fuel Used)

[Magister]

Originally Posted by electromike

Hi, I have just attempted to calibrate the tank with the first fill up and want to make sure I got the math right.
The OBDuino said I used 38.54 Liters
Filling up I actually only used 33.109 Liters
The OBDuino had a setting of 85% V.E.

What should the new calibrated value be at? 73%?

Thanks for the help!

I assume the fromula should be this:

New V.E.% = (Actual Fuel Used * Current V.E.%) / ( OBDuino Reported Fuel Used)

If it displays VE it means you have a car without a MAF and with a MAP (a Honda), right?
Yes you can decrease the VE and it will decrease the fuel used.

If you have a MAF you need a new version of the code where I introduced a "fuel ratio" percentage.

[americasfuture2k]

whats this OBDuino stuff relating with MAP and VE??
the car i planned on putting a mpg meter on was my fiero and it has a ECM swap which doesnt run a MAF. it uses a AIT at the filter and uses a MAP. my ECM is known as Speed Density(1227730). does that have any affect to choosing what kind of mpg meter i will need to use? this new to me OBDuino or the MPGuino??? im lost now that i have seen another name thrown around and using some other sources that i also have in my fiero.

EDIT : ok, now i see it is for obd ii. so it will not work for my fiero.

[Mothinator]

Originally Posted by Justin K

Hi all,

I'm pretty new with arduino coding, and have been away from coding in general for a few years. I just downloaded version 121 of the source code and tried compiling it but I get an error:
In function ‘void params_save()’:
error: invalid conversion from ‘const void*’ to ‘void*

with reference to this line:
eeprom_write_block((const void*)&params, (void*)0, sizeof(params_t));

Justin K, I'm in the same boat as you. I'm using version 0012 on Linux. Have you posted this to the Arduino forums? If so, could you post a link to the thread.

@Magister, thanks for your hard work on this project. I've been looking for a project to introduce me to electronics and this one caught my eye. I can't wait to get it working.

[Magister]

Originally Posted by Magister

If you have a MAF you need a new version of the code where I introduced a "fuel ratio" percentage.

I put a new version of the code where you can adjust the speed reported and the fuel reported.
To calibrate speed (and so, distance), I go on the highway, display the speed on the OBDuino and check it with my GPS.
To calibrate fuel, I display fuel used and when I fill the tank I adjust it.
For instance on my 07 Elantra I have to use 102% for speed and 110% for fuel (and because of winter it changes a few percent sometimes)