open source Atmel/arduino PID motor control - Page 21

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Thread: open source Atmel/arduino PID motor control

  1. #241
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    Default Re: open source Atmel/arduino PID motor control

    That certainly is not right. Your zero cross detector is suppose to sync with your line freq. Are you triggering your 'scope to the line freq? Else it will stay the same if it triggers with itself.



  2. #242
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    Default Re: open source Atmel/arduino PID motor control

    No, my scope doesn't support such high voltage.
    The signal shown previously is the Arduino's input.



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    Default Re: open source Atmel/arduino PID motor control

    I would use the Arduino input (ZC) to also trigger your 'scope and then 'scope your pulse output of the Arduino, which should move position with pot rotation.



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    Default Re: open source Atmel/arduino PID motor control

    I am afraid I don't know how to do that.



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    Default Re: open source Atmel/arduino PID motor control

    Have you used EXT trigger?
    Must be a front panel jack for an external trigger. You would this jack to connect to the ZC signal going to your Arduino input. Then set your trigger mode to external. You monitor on channel 1 (or 2) the Arduino output pulse.
    I don't have your type of 'scope so I can't give specific steps to follow.



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    Default Re: open source Atmel/arduino PID motor control

    Oh I see !
    The pulses are fixed when the pot is at a low value (around 100) but are scrolling when I raise it.

    open source Atmel/arduino PID motor control-img_3459-jpg

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    Default Re: open source Atmel/arduino PID motor control

    So the pulses do move relative to the zero crossing signal. The next step is to figure out why the motor doesn't change rpm with the pot change.



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    Default Re: open source Atmel/arduino PID motor control

    Hi all,
    this project have a protection about motor stuck or over current or not?
    Thanks.



  9. #249
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    Default Re: open source Atmel/arduino PID motor control

    The protection is a fuse in the motor wiring. The fuse should be sized such that if the motor stalled the fuse will blow. This fuse amperage selection will vary depending on the motor selected and its current ratings.



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