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Digital Speedometer

chad dickin

Hi friends,

first of all, excuse-me for my Biiig delay in posting this message.

I was on vacation and far away from computers ! It was hot and sunny and very peacfull and there were girls and drink and all the other things.

Well, IÂ'm doing my speedometer using a processor.

The Timer 0 counts a 250 MS period and Timer 1 works as a pulse counter.

I know that my Opel Corsa has a Speed Sensor (VSS) which could be used to give me the right number of pulses for each carÂ's wheel revolutin (i guess it is 8 pulses / revolution in a 14 inch wheel)

IÂ'm trying to do a Schmitt Trigger with a Ne555 to capture de pulses from a sensor

The problem is that in this bad country no one wants to give the right information about the sensor. Everybody wants to sell the information in book for about US$ 80,00 ! ! ! ! ! !

have you ever did something with carÂ's Speed sensor ? Is the output of this kind of sensor in low voltage enough to work with the 555 ?

If you have any information about the speedometerÂ's implementation... Anything.... Iwould be happy !

thank you !

Sérgio

Parents
  • 0 in reply to chad dickin

    1) I have no idea who Erik Mallard is
    2) How can no suggested method till you measure the pulses be a dangerous silly bad sugestions
    3) You go ahead and blow the ECUs sense of the speed, I am not a carbuff and have no idea what that will do to the ECU, it is up to you whether to take the risk.
    4) If you parallel the 100 ohms with whatever the ECU uses for sense you WILL upset something. and, if the ECU uses high side sense you will blow it.
    5) Who is "John and Mantra", not that I care, just do not bring up things in a forum nobaody can decipher.
    6) I wonder why you refuse to measure the pulses going into the ECU. That would establish a firm base for the design.
    7) If you live where Christmas is celebrated, have a merry one.

    Erik

Reply
  • 0 in reply to chad dickin

    1) I have no idea who Erik Mallard is
    2) How can no suggested method till you measure the pulses be a dangerous silly bad sugestions
    3) You go ahead and blow the ECUs sense of the speed, I am not a carbuff and have no idea what that will do to the ECU, it is up to you whether to take the risk.
    4) If you parallel the 100 ohms with whatever the ECU uses for sense you WILL upset something. and, if the ECU uses high side sense you will blow it.
    5) Who is "John and Mantra", not that I care, just do not bring up things in a forum nobaody can decipher.
    6) I wonder why you refuse to measure the pulses going into the ECU. That would establish a firm base for the design.
    7) If you live where Christmas is celebrated, have a merry one.

    Erik

Children