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Short/open detection with optocoupler in a h bridge with arduino?

  1. sergio21345

    sergio21345

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    Oct 30, 2015
    sergio21345 submitted a new Showcase Item:

    Short/open detection with optocoupler in a h bridge with arduino?

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  2. dorke

    dorke

    2,344
    663
    Jun 20, 2015
    You can place a "current sensing device" in the bridge like shown
    (Q2 and Q4 as in your drawings).
    Not directly over the electrodes, but related to GND.
    If the current is low in normal operation a small resistor can do the work.

    It will produce a PWM voltage signal with the "On" period proportional to the current flowing through the electrodes regardless of electrodes polarity.
    In general ,you can filter the PWM signal to get a DC voltage proportional to the PWM ratio used and the current through the electrodes.
    This filtered stable DC voltage can be read by the Arduino

    what is the frequency of the PWM you use,are you varying H-bridge.JPG the ratio or is it fixed?
     
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