RMP meter

Discussion in 'General Electronics Chat' started by Dritech, May 18, 2013.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    5
    Hi all,

    Is it possible to do an RPM meter without using a microcontroller? Do you know of any circuit that I can refer to?

    Thanks in advance.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    Look at Lm2917 ic, this thread may be closed if its an automobile modification.
     
  3. #12

    Expert

    Nov 30, 2010
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    6,762
    How do you think speedometers and tachometers were done before microprocessors were invented? Do you think we all just sat on a bench and guessed at how fast the locomotive was going? (Whippersnapper!)

    Think: Frequency to voltage converter.
     
  4. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    @ Dodgydave

    No this is going to be used to measure the RPM of a small DC motor.
     
  5. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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  6. #12

    Expert

    Nov 30, 2010
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    $%^& I'm too slow today. Better that I go back to fixing the lawn sprinklers. Got any circuits that operate a shovel?:D
     
  7. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    You can do it digitally with a crystal clock and counters, or you can do it in analog with the suggestions of posts #2 or #5. This is presuming you have some sort of pickoff from the motor to give pulses that are proportional to the motor speed.
     
  8. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Thanks for your suggestions :) I will do some research about the mentioned IC
     
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