SJ
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| posted on 17/11/17 at 02:56 PM |
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Speeduino - Arduino based ECU.
Anybody had a look into this: Link
Looks like a great value way to build an ECU.
Stu
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SPYDER
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| posted on 17/11/17 at 03:27 PM |
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There are two Arduinos on my car. One is translating gearbox sensor pulses and running my mechanical speedo via a stepper motor. The other is running
a seven segment AFR display. I've been watching the Speeduino forums with interest and will be fitting one to my mate's TR4 when he goes
over onto throttle bodies. It uses the same TunerStudio tuning software that Megasquirt uses and I'm reasonably up to speed with that.
The spec looks favourable enough and will easily run most setups.
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scudderfish
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| posted on 17/11/17 at 05:26 PM |
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I've been keeping an eye as well  I think if I was considering an MS1 for my car today, I'd look at Speeduino instead. It apparently
works with the excellent MSDroid Android software as well.
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02GF74
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| posted on 18/11/17 at 10:31 AM |
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quote:
Originally posted by SPYDER
The other is running a seven segment AFR display. .
just curious as to why did you go that route - that is an expensive and unnecessarily complex way to do it - a single PIC could more or less do that.
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SPYDER
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| posted on 18/11/17 at 11:08 AM |
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^^^^^^^ Hi there. I just used the stuff I had to hand. I bought a few cheap Arduinos from a friend.
My wideband outputs AFR as a varying voltage, 0-5V. I knew that the Arduino could deal with that so thats the way I went.
The speedo project was a little more involved, however.
When converting to an AZ6 six speeder I lost the cable drive to my Veglia speedo. I did a bit of research and found that people were using either a
servo motor or a stepper motor to get around the problem. I opted for the latter.
The Arduino first measures the incoming gearbox sensor pulses and derives a frequency. It then produces a proportional square wave tone which passes
to the stepper motor driver board. I found a prog for each of the two stages on the net and amalgamated the two with help from my son.
That was the easy bit.
Despite buying a high revving stepper it wouldn't co-operate fully. To overcome this I put a little reduction gearbox ( fitted in reverse) in
between the stepper and the speedo. I used a friend's lathe to make the interfacing flanges. As you may have guessed I am a fan of
over-complication and have a lot of time on my hands. Therapy might help.
In my defence the car retains it's original speedo. Which I like.
And it works fine, thankfully.
If starting over I would go the servo motor route.
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coyoteboy
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| posted on 18/11/17 at 12:07 PM |
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I'm all about the hackery, but the stepper and box driven speedo is a serious case of "just because you can doesn't mean you
should"
Same applies to arduino ECU I fear. Fun projects to prove you can but the engineer would pick the simplest and cheapest solution.
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scudderfish
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| posted on 18/11/17 at 02:05 PM |
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quote:
Originally posted by coyoteboy
I'm all about the hackery, but the stepper and box driven speedo is a serious case of "just because you can doesn't mean you
should"
Same applies to arduino ECU I fear. Fun projects to prove you can but the engineer would pick the simplest and cheapest solution.
Our cars are never the simplest & cheapest solution.
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Fatgadget
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| posted on 18/11/17 at 02:24 PM |
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quote:
Originally posted by coyoteboy
<snip>I'm all about the hackery, but the stepper and box driven speedo is a serious case of "just because you can doesn't
mean you should"
Same applies to arduino ECU I fear. Fun projects to prove you can but the engineer would pick the simplest and cheapest solution.
Not the engineers I know! They allways up in arms with the bean counters to come up with ever cheaper solutions than the elegant one's that
usually spring to their minds! 
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02GF74
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| posted on 18/11/17 at 03:09 PM |
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^^^^^I'm sure I've seen that stepper motor driven speedo before and probably made same comments.
Not the simplest or cheapest solution but it works and it kept you amused which is what is important.
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Oddified
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| posted on 18/11/17 at 08:42 PM |
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Agreed, sometimes i do things 'just because i can' that doesn't always seem sensible to anyone else! lol
Ian
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