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Old 08-29-2008, 10:27 AM   #561 (permalink)
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CMags: nice looking unit. I had a problem with my switches being so close together, so I made sure to space them out more.

How do yours work, like when you are driving? Do you tend to "fat finger" them at all? And, how are those particular switches, are the a solid "feel" and don't double bounce on you? I had some of the RS ones for a different project (many moons past) and found them sloppy.

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Old 08-29-2008, 11:01 AM   #562 (permalink)
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I guess I've got pretty skinny fingers, but I don't have any problems with these at all. They're 1/2" apart on center, so that's perfect for me. Haven't had any double-bounce issues, just sometimes it doesn't register if I don't press firmly.

Now that it was mentioned, my buttons do look a little different from what's pictured on the site. They're a little more solid, but I think that's just b/c of the metal sleeve that extends beyond the threads. I'll take a closer look at 'em and post up a pic later.
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Old 08-29-2008, 11:09 PM   #563 (permalink)
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Quote:
Originally Posted by dcb View Post
We took a trip in the saturn and the instant speed readout for version 0.70 is very smooth. I have to get the portable scope working or borrow one.
I have a 87 nissan 300xz and my vss readings fluctuate consistantly and greatly from 50 mph to 30 mph every 5 or 6 seconds. Otherwise it works very well except that once in every 5 or 6 seconds. The Car has 220k miles on it though, so i could be just an old speed sensor??
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Old 08-29-2008, 11:26 PM   #564 (permalink)
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Have you been able to dial in the trip distance?

I've noticed that the trip on the metro seems pretty accurate despite the jumpy instant speed reading, which means it is getting most/all of the vss pulses anyway.

The cheap fix is to skip the timing of the vss pulses and just compute "instant" speed based on last few seconds worth of pulses instead of the last .5 seconds worth.
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Old 08-30-2008, 10:29 PM   #565 (permalink)
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Nah, the think went nuts on me again, same thing that happened to wagonman76

I'm going to look at the transistor circuit like he did, and hopefully fix it

I think mine got too hot in my car being probably 100+ degress in there with the stupid glass t-tops baking the interior (ac doesn't work either), need to make pizza box sunshades for that.
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Old 08-31-2008, 12:25 PM   #566 (permalink)
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Installed an MPGuino in my car (1998 Metro / Firefly) this weekend. I started a new thread, to keep clutter down here. (dcb: if you think it's better off in this thread, let me know and I'll merge it over.)

http://ecomodder.com/forum/showthrea...efly-4864.html

---

Also.... the MPGuino wiki. Think it's worthwhile starting a new thread to talk that over in more detail? How would you like to see it evolve, content wise? I was talking to Ben, and have agreed that one or both of us will take an active role in shepherding that part of the project, if you like.
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Old 08-31-2008, 11:39 PM   #567 (permalink)
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An idea for the instant speed problem. (Stolen from the space shuttle software.) Take 3 time readings (time between pulses) and average the 2 that are closest in value to each other.
If you have the following 3 values: 100 45 47, have it throw out the 100 and return a value of 46.

I have some experience in optimizing code. Would you mind if I look at the source and help save some memory?
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Old 09-01-2008, 02:03 PM   #568 (permalink)
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Button cover idea I had.
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Old 09-01-2008, 03:36 PM   #569 (permalink)
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Has anybody considered the ATMega128 controller? (Link: ATMega Controller) It has double the clockspeed, 4K EEPROM, 128K FLASH. Does anybody know if this is compatible with the Arduino? I'd like to be able to add some extra functionality, and I think we're going to hit the limits of Arduino's FLASH.

Also, I was thinking about wiring a relay across analog pin 2 from the headlight stalk and adding code to dim the brightness when I turn on the headlights. Anybody see an issue with this?
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Old 09-02-2008, 07:47 AM   #570 (permalink)
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Mine has been working like a million bucks since bypassing that transistor circuit. NO glitches since, not even one. And its still been hot here too.


Quote:
Originally Posted by forgottenmindset View Post
Nah, the think went nuts on me again, same thing that happened to wagonman76

I'm going to look at the transistor circuit like he did, and hopefully fix it

I think mine got too hot in my car being probably 100+ degress in there with the stupid glass t-tops baking the interior (ac doesn't work either), need to make pizza box sunshades for that.

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