Hot!Measuring resistance value by using pic controller

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john_ive
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2018/01/13 00:50:29 (permalink)
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Measuring resistance value by using pic controller

hai friends,I like to read the resistance value by using the pic controller.
I used the voltage divider and I can get the resistance values also.But when I tired to find the low values like "1 OHM" like means it can't showing the values.
I need to calculate "resistance in OHM value" also.
How to measure the resistance values in OHM by using pic controller..?
#1

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    qɥb
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    Re: Measuring resistance value by using pic controller 2018/01/13 01:12:47 (permalink)
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    What is the full range you want to measure?
    i.e. minimum and maximum?
    What precision do you require?
     

    This forum is mis-configured so it only works correctly if you access it via https protocol.
    The Microchip website links to it using http protocol. Will they ever catch on?
    PicForum "it just works"
    #2
    john_ive
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    Re: Measuring resistance value by using pic controller 2018/01/13 02:01:33 (permalink)
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    From 10 ohm to 1K.With precision of 1 ohms
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    RISC
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    Re: Measuring resistance value by using pic controller 2018/01/13 04:20:32 (permalink)
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    Hi,
    Maybe you can use a PIC with a CTMU unit (fixed current sources) ?
    Regards
     
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    NKurzman
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    Re: Measuring resistance value by using pic controller 2018/01/13 09:39:02 (permalink)
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    So that is 990 possible values with a 10 bit a/d that can read 1024 values. A voltage divider is non linear, so this is not happening.
    You will either need a 12bit a/d or a more complicated measuring circuit.

    Another posibilty is time. Pics are great at that. You can try an R/C circuit and see if that is better.
    #5
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