I need to drive my mechanical speedometer from a hall effect impulse

Discussion in 'The Projects Forum' started by Stooligan, May 25, 2016.

  1. Stooligan

    Thread Starter New Member

    Apr 16, 2016
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    0
    I have recently changed my gearbox, and the new box has no speedometer output
    so I have made a 36 segment disc to put on the propshaft so now I need a board 12v driven with adjustment
    to couple to a motor to drive the speedo head. Can any one recomend a proprietry board or a circuit diagram
    that I can use as I wish to retain the original Speedometer
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,777
    1,103
    Welcome to AAC!
    What is the spec of the motor you plan to use?
    Can you post a link to the Hall sensor?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Did you calibrate the speedo to find the rpm required/mile indication etc?
    You could maybe utilize the pulses direct or multiply and feed them to a stepper motor drive step pulse input terminal.
    But obviously some calibration is going to be needed.
    Max.
     
  4. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,138
    200
    A SIMILAR thread was started recently. Add-on cruise control used the driveshaft sensor.

    The easist is likely a ucontroller that:
    1) measures the frequency or period and converts to speedo RPM.
    2) A motor with some sort of tach signal (encoder, analog) that can be controlled at a specific RPM.
    3) The motor would be pulse width modulated to control speed.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    One advantage with a stepper is no feedback is required, just the No. of pulses/min.
    Max.
     
  6. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    I agree with Max that a stepper motor would seem to be an easier way to go.
     
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