Help scaling voltage...

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  1. - 30th July 2007, 16:37 #1
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    sirvo
    sirvo is offline Member
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    Default Help scaling voltage...

    Hello.
    I'm trying to measure my car fuel level and something is wrong. The fuel sensor scale is 0 - 6V and, of course, I would like to read from 0 - 5V. The image attached shows the schem I've down till now.
    The thing is that the sensor value is 4.95V (now) and 4.12V is expected in PIC. It is getting 3.6V.
    I suppose that there can be 2 mistakes:
    1) LM324 VCC must be more than 6V.
    2) There is a voltage divider between POT and LM324 output impedance causing voltage in POT be less than fuel sensor signal.

    Hope you can help..

    Thanks in advance AGAIN!

    Sylvio
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    Last edited by sirvo; - 30th July 2007 at 18:06.
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