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Automotive Apps? — Parallax Forums

Automotive Apps?

ColtColt Posts: 24
edited 2008-03-10 02:43 in BASIC Stamp
· Has anyone used a BS2 in a automotive application before?· Curious about noise filtering, and what you guys have done to help filter it.. I've used microcontrolers before in automotive apps before, but for the most part there was noise filtering already included in the design. I added to that with your common filters, and using shielded wiring where needed. Just not sure what I should start out with, since I'll be doing this from scratch.. It's different than running a stamp on a bench thats for sure, just looking for some suggestions from someone who has experience with it.

· What I'm wanting to do is add a fast idle control to my truck, which is diesel. For the most part it's pretty "quiet", since there·arnt any ignition components. The only time you get a lot of noise is when the intake air heater is on (·depends on oil temps and the start cycle·to determine run time·), draws 70amps, making the alternator work pretty hard. I bet I can get away with just a few large caps, but not sure.·The truck already has fast idle when warming up, but after heavy towing letting the truck idle to cool the tranny temps and oil temps can cause diesel stacking·( washing of the cyl's ), the increased RPM stops that by keeping heat in the cyl's to fully burn the diesel. Also nice to have it for·charging batts or maintaining voltage when under high loads. Most consumer products that do this are in the 5-600 dollar range. I have a few other things I'd like to have a Stamp do, this type of stuff is why I got interested in Stamps, automotive apps but this is the first project I've decided to do from scratch ( not a DIY kit )..

Comments

  • FranklinFranklin Posts: 4,747
    edited 2008-03-09 15:34
    Several people have used Stamps in automotive and motorcycle applications, check the completed projects forum. Yes noise is an issue and you need GOOD filtering. Google automotive power filtering for some ideas.

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    - Stephen
  • stamptrolstamptrol Posts: 1,731
    edited 2008-03-09 16:55
    Colt,
    I've done several hundred Stamp installations on both gas and diesel without too much trouble. I always use a 5 volt switching regulator with the recommended caps and try to make any auxilary equipment ( motors, solenoids, etc) run on the vehicle supply, whether 12v or 24v. Don't leave the programming cable dangling when you're not programming because it will cause mystery resets.

    Cheers,

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    Tom Sisk

    http://www.siskconsult.com
    ·
  • ColtColt Posts: 24
    edited 2008-03-10 02:43
    Thanks for the suggestions, I've browsed through the completed projects page in the past, I'll go back and see what everyone is using for filtering..

    Using the recommended filtering on sample circuits found for switching regulators is what I considered doing and just leaving it at that, unless I ran into trouble. I may add a few filtering caps just incase. There wont be any loads on the stamp, just controling a digital pot, so for the most part I doubt I'll have any trouble.. I have ran into problems before leaving the programing/communications cable dangling, resets and such, always good to be reminded of it though. On my drag car, which uses a MegaSquirt ECM, the cable spends most of it's time hooked up. When I first got it all going I was running into reset problems which took a while to troubleshoot, would reset when the laptop wasnt hooked up, when I'd try to monitor what was happening it would stop doing it, since I was hooking the laptop up to the ECM.. Took a while but it dawned on me.. Took care of it by making my own cable out of shielded wiring, since taking the cable on and off the ECM was a nightmare...

    Thanks for the replies guys, now to just find some time to get it all hooked up in the truck..
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