tachometer and speed control

Discussion in 'Embedded Systems and Microcontrollers' started by h.d, Nov 17, 2007.

  1. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    hi all
    am need help about how to measure motor speed by tachometter
    and take the output of tacometer as feedback signal to PIC controller
    by which i controle the speed of motor by PWM?
    i know that the output of the tacho. is voltage and its analog signal
    and i think i should ise ADC to enter that signal to PIC
    finally "am not familiar with PIC ,know am tray to study it"
    and i will use 16F877A
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The frequency of the signal is more informative than the waveform itself. Counting the tach output for a period of time is easy to do with a PIC. There are many threads on this site that deal with PIC microprocessors and their applications. There is also a ton of stuff on the PIC's website.

    That is the cart before the horse, however. You will first need to get the programmer for the PIC chip and learn how to write code for it.
     
  3. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    ok , am search in th web and dont find my requiste........
    is thier any body to help
    my problem is how to use the signal of the sensor and make it compatable with the pic
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Can you characterize the tach output? The only thing necessary to make it compatible is a voltage swing within the limits of the PIC's Vcc & Vss.
     
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