pwm with voltage monitoring


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  1. #1
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    Exclamation pwm with voltage monitoring

    Hello i need a Idea how run a DC Motor but monitoring the voltage with a A/D pin.

    my problem is my Volt Divider is not Stable so mi reading are no correct.

    10k and 10.5k in my Divider
    Last edited by jetpr; - 23rd January 2008 at 01:48.
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  2. #2
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    Hi, ...

    Just read the voltage ... during OFF periods of the PWM drive ...

    Alain
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  3. #3
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    Lightbulb

    that you mean i have to turn off the motor to read the volts
    or
    please send a example

    thanks
    My Hobbies is PicBasic PRO

  4. #4
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    Lightbulb

    Motor is turned off automatically during PWM off ( or LOW ) periods ...

    just sample and hold during this moment.

    that's how all ESCs current limiting devices work ... they just sample the power mosfets voltage loss ( = Intensity * Rds ON ... ), and compare with a reference.

    Here, the "free running" ( PWM LOW state ... ) voltage of your motor is proportionnal to the rotor speed ...

    That's all !!!
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

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