help to build digital car speedo meter

Discussion in 'General Electronics Chat' started by kamalsolimen, Oct 3, 2014.

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  1. kamalsolimen

    Thread Starter New Member

    Oct 3, 2014
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    hello

    i start to build digital car speedo meter i have honda civic 93

    i dont know Vehicle Speed Sensor output its frequency or voltage , mhz = volt = speed

    i will use pic16f877a and LM2907 if output is frequency

    and i need help to build circuit digram

    thanks
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
    2,369
    At one time the output was taken from the final shaft of the gearbox, now, electronically, I am not sure at what point they take it from, but the common way is by a hall or similar sensor.
    Why use the LM2907? Keep it pulse timing instead of going analogue.
    Max.
     
  3. kamalsolimen

    Thread Starter New Member

    Oct 3, 2014
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    i use LM2907 to convert frequency to volt i dont know how to count plus use pic16f877a
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    http://forum.allaboutcircuits.com/showthread.php?t=54400

    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good luck.
     
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