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?
     

    PicForum "it just works"
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    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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