How i ken read 7.2v with pic

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  1. - 18th June 2006, 09:44 #9
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    Quote Originally Posted by serandre
    Hi,

    I need to read a car battery, ...i have used a zener 10v to drop the voltage to 0-4.8v.

    Should i modify it to use voltage divider (10K/5K) instead ?

    Sorry eletronic is just a hobby to me, just learning :-)
    Hi, Serandre

    Your Zener idea is not so bad ... but zener voltage is not stable with temp .!!! so, your measurement will be somewhat false ( in a car temp is not so constant ...).

    There would be a simple solution : use a cheap TL431 trimmable "zener" instead of the diode. see TL431 datasheet for that.

    http://pdf1.alldatasheet.com/datashe...OLA/TL431.html

    Alain
    Last edited by Acetronics2; - 18th June 2006 at 09:46.
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