diy mpg gauge

[sonyhome]

skewbe:

I'd love to code the program to make what I think would be a great hypermiling diagnostic tool, I have quite a few ideas on how to present the data usefully. However I need lo learn Java first . I did look at the graphic libraries, and it's too bad, it seems one has to code the graphic interfaces (for like 2D graphs, gauges etc.) so there's some overhead work to make a cool tool.

I think the config file you have is pretty well thought, it does allow adjusting the tool.

itjstagame :

With this gizmo you could have what you want. It's just a matter of programming.

Caprice:

I think it boils down to this:
- Find Vss and one injector wire
- Solder wires to needles and stick them in to tap those signals.
- At the other end, follow the diagram, aka solder to a 1/4" (?) headphone plug (each wire to center connectors and the diode bridges between those wires and the outside ground connector), and the ground to the car's chassis. Note that there's a resistor there, and it's to make sure you don't just ground the signals with the diodes. When the diodes pass current, it's via the resistor, which makes the current draw very small.
- Boot your PC or whatever, and run skewbe's Java app. For that I personally made a batch file that just calls the java program, else Windows doesn't launch it (maybe one needs to register the .java extension as a runnable program?).

The program works w/o the car: just with noise on the microphone it'll do some random stuff.

mpmetro:

That's some ugly soldering LOL
make sure that glue holds tight.