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  1. #6
    Some sensors have internal pull up resistors built in hence the calculation to determine it. In my case that value was 10K so no external resistor is required.

    Your PDF explains that very well. saying R1 + R2 needs to be 10K if R1 (internal) is 10K then R2 (external) is not needed.

    Hope this helps. ..Clive
    Last edited by Clive S; 10-07-2014 at 05:15 PM.

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