Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!think.com!cass.ma02.bull.com!mips2!bubba!sje From: sje@xylos.ma30.bull.com (Steven J. Edwards) Newsgroups: sci.electronics Subject: Cruise Control Speed Pick-up (was: Re: Inductive pickups.) Message-ID: Date: 3 Jun 91 17:17:28 GMT Sender: @mips2.ma30.bull.com Organization: Bull HN, Worldwide Information Systems, Billerica, Mass., USA Lines: 33 In article <1974@ole.UUCP> ssave@ole.UUCP (Shailendra Save) writes: > From article , by jon_sree@world.std.com (Jon Sreekanth): >> In article <5170138@hplsla.HP.COM> tomb@hplsla.HP.COM (Tom Bruhns) writes: >> ssave@ole.UUCP (Shailendra Save) writes: >> >> > I am trying to get a signal from the drive shaft of my car >> >using an inductive pickup. (To calculate and display speed) >> lighter, don't you see noise correlated with the spark plug firing >> on top of the 12V ? Can that be used ? >> > If I wanted a transducer for a tachometer, I would. I meant > automobile speed when I said speed. Sorry about that. For the > tach, I *am* using pulses from the primary of the coil. (A little > cleaner and easier than the cigarette lighter) > Good idea though. I believe that most cars manufactured in the past decade that allowed cruise control as an option already have an electric pulse signal terminal somewhere in the back of the speedometer housing. This was true of a 1981 Volvo in which I installed cruise control, and the instructions for the generic cruise control electronic module seemed to indicate that this was a standard feature. It is much easier to use this as a signal source than to fiddle with the driveshaft or with transmission cable mechanical linkages. == Steven J. Edwards Bull HN Information Systems Inc. == == (508) 294-3484 300 Concord Road MS 820A == == sje@xylos.ma30.bull.com Billerica, MA 01821 USA == "That Government which Governs the Least, Governs Best." -- Thomas Jefferson