Expermintal FE meter, first pictures...

[JohnnyGrey]

This is the prototype of my DFM7 gauge. The display doesn't photograph very well in low light. Four buttons are soldered on the underside of the board: Left, Right, OK and Cancel. I've run a program on it already that does a good job displaying MPG on my specific vehicle, but now it's time to implement a complete menu system so that I don't need to reflash it to make adjustments. In addition to the typical trip and tank mpg/distance/fuel consumption numbers, I'm adding a historical average that doesn't reset when you fill up. This will be useful for calculating economy over long periods of time.

[diesel_john]

trip reset is the most important to me, as gas goes up, it means shorter tests.

[SVOboy]

Looks pretty good so far!

[JohnnyGrey]

trip reset is the most important to me, as gas goes up, it means shorter tests.

Trip reset is accomplishied by holding down the left and right buttons simultaneously.

[JohnnyGrey]

Some more info...

MCU clock speed: 1.00 Mhz
Injector sampling rate: 125 Khz
Display refresh rate: 1.9hz

Display screens:
Trip A: Up to 65 gallons with 1/1000 gallon resolution, up to 655mi 1/100mi resolution
Trip B: Up to 6553 gallons with 1/10 gallon resolution, up to 65Kmi 1mi resolution
Tank: Same fuel resolution/range as Trip A. Any need for more than 655 miles?

[PaleMelanesian]

I've gone more than 655, twice. Is it a big deal to change that? I'd be fine with 1/10 mi instead of 1/100 for the tank. That's all my odometer gives me, anyway.

[JohnnyGrey]

Yes, I can do 6553 miles with 1/10 precision. Now does anyone have a tank exceeding 65 gallons?

[rocket]

are there any of these DIY gages (like this one) that are easy to create for thoes of us who are not circut/programing savy? I know basic circut stuff, basic soldering, etc but have never made anything like that. I'm more the mechanical kind of guy.

[dcb]

I don't know what JohnnyGrey's plans are with his device, he has only announced that it is not open source. But there are a number of people working on the open source mpguino . The goal of that project is to put fuel consumption feedback into as many hands as possible (read cheap and easy), so if you take a look and post over there about where we lost you then you would actually be helping too

http://www.ecomodder.com/forum/showthread.php?t=2115

[rocket]

Thanks dcb, i looked over that post and helping develp that stuff is out of my leage. I'll just have to be a leach and attempt to build it after its 'perfected' or just get a sgII