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Old 02-01-2013, 03:54 AM   #1 (permalink)
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VSS signal incorrect

I've took a Arduino Nano v3 and added the signals from my ECU (fuel usage) and conditioned VSS signal. Everything seems to work, when I drive a bit it gives me a speed, and a fuelconsumption. The last part seems accurate, but the speed isn't.

While cruising at a constant speed the speed the speed jumps up and down. But what's even more strange, is the first 2-3 stops the speed drops to zero, but after a couple of miles driving the next stop the MPGuino still thinks I'm driving.

Does anyone have a clue what might be wrong?

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Old 02-04-2013, 07:35 AM   #2 (permalink)
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You may try shielded wire for VSS signal. It seems that your wire is catching some external noise.

Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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Old 03-02-2013, 06:26 PM   #3 (permalink)
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I have a 94 civic DX coupe, should be the same as the 95 4dr in the MPGuino wiki which says 8214. I had to set it to 10400 to get close, and another thing is regardless of what I put in the "timeout" it won't seem to turn off itself. 7 minuites? I've waited HOURS

My suspect, is the 1.0.3 arduino software to load the uno.

In the sketch it says /* YOU NEED TO USE ARDUINO VERSION 0011 !!!!!! */
//it won't fit with the new math libraries that come with 0012, sorry.

version 0011 will not run on my machine, can anyone address both our problems?
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Old 03-04-2013, 03:15 PM   #4 (permalink)
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I've found out what the problem was. I used my laptop to power the Arduino (through USB) and I didn't have an extra groundwire from the arduino to the car. That caused false positive pulses. Once I'd changed to power from the car the problem disappeared.
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Old 03-05-2013, 04:28 AM   #5 (permalink)
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I had the same problem with vss signal and all i did to solve this was to connect the negative pole of the mpguino to the chassis and not to the battery pole...

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