How to measure Current with a Pic

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  1. - 17th August 2010, 14:35 #1
    Acetronics2's Avatar
    Acetronics2
    Acetronics2 is offline Fanatical Contributor
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    Lightbulb

    Hi,

    If it is only an overload protection ...

    I generally use the output stage Mosfet RdsON as the shunt ...

    just use a BS170 to connect the Drain to a comparator ONLY when Power mosfet gate powered. ( one 4066 gate could do it too, but ... ???)

    sooooo simple ...

    Alain

    PS ; and like that ???
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  2. - 17th August 2010, 15:52 #2
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    tallen
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    Default How to measure Current with a Pic

    I guess I don't fully understand this concept. If I have a load of 20 amps then with a .1 ohm series resistor that would be about 2V at 40 Watts. I guess I'm missing something simple.

    The $10 part would be too expensive to add to this board. I was hoping for $3 or $4.

    Thanks,

    Terry
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