Battery checker

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  1. - 29th January 2007, 13:31 #1
    lerameur's Avatar
    lerameur
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    Talking

    Anybody ??
  2. - 29th January 2007, 14:01 #2
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    Wink Rtfds !!!

    Hi,

    I think ( ! ) a look to the '88 Datasheet ( ADC config ) could help you a bit ...

    Alain

    PS: common diodes as voltage refs ... that's a bit rock and roll ...
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  3. - 29th January 2007, 14:29 #3
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    I just changes the circuit a bit. I have new ideas this morning. night was good.
    I am getting 1.06v steady on the diode as reference. My voltage divider shows me 0.7, but I am getting zero as output now.
    Is it the hardware or the programming ?
    I posted a new pic.
    http://www3.sympatico.ca/lerameur/
    also changed this line:
    ADCON1 = %10010010


    ken
    Last edited by lerameur; - 29th January 2007 at 14:36.
  4. - 29th January 2007, 15:58 #4
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    Quote Originally Posted by lerameur View Post
    but I am getting zero as output now.
    Is it the hardware or the programming ?
    I posted a new pic.
    http://www3.sympatico.ca/lerameur/

    ken
    Picture show you have both input connected to same place (ref. diode), resistor divider left unconnected.
  5. - 29th January 2007, 16:51 #5
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    I got it going somehow. I dont even know what I was doing wrong...
    maybe I am still sleeping
    k
    Last edited by lerameur; - 29th January 2007 at 17:18.
  6. - 30th January 2007, 14:14 #6
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    Ok I think I know where lies the confusion.
    Ihave two batteries I want to check.I can check the battery that powers the microcontroller with voltage reference. I am trying to check the second battery . There is no common ground and I dont want one because of the isolation I want to have. Therefore I think when I do an A/D, is reads as a floating value.
    How do I go around this ?
  7. - 30th January 2007, 14:29 #7
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    lerameur, Why not just read the total voltage of the series connection and then the lower cell voltage. Then subtract the lower voltage from the total voltage to get the upper cell voltage? That way you only have 1 ground connection.

    Dave Purola,
    N8NTA
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