Sorry, yet ANOTHER mod question

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  1. - 30th January 2014, 11:12 #5
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    Gusse
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    Default Re: Sorry, yet ANOTHER mod question

    What kind of voltage divider you are using?
    If you try to get full 0-5V scale with 0-15V input, then you should use 1:3 ratio (e.g. 22kOhm and 11kOhm resistors) to get best measurement accuracy.

    With this divider 15V -> 5V (and 0V -> 0V) at ADC input pin, ADC should show 255 (8bit) or 4095 (12bit).

    Math to show input voltage based on ADC value.
    8bit ADC:
    Code:
    VOLTS_VAL = (15 * VOLTS_IN)/255
    12bit ADC:
    Code:
    VOLTS_VAL = (15 * VOLTS_IN)/4095
    Last edited by Gusse; - 30th January 2014 at 11:18.
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