ds18s20 reads incorectly


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  1. #1


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    Default Still ?

    I Do Appreicate Your Inputs
    Manwolf Your Program Looks Great But Way Beyond My Knowledge
    And As For As The Ds18 Goes I Have Tried Several

    Again To Ask ?
    Why Does Mikro Work Where Pbp Does Not
    There Has To Be Some Difference In The Compliers

    Using Exactly The Same Hardware Easypic4
    Could It Be The Math Conversion Using Pbp

    Both Programs Use The Same Formula For C To F

  2. #2
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    How are you reading the temp form the DS18S20 in PBP?
    Are you using one-wire or something else?

  3. #3


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    Default programs

    i have attached the 2 programs one in pbp which reads temperature incorectly
    the other mikroe which works no hardware changes are made really interested in the difference


    thanks

    jack
    Attached Files Attached Files
    Last edited by jcleaver; - 23rd July 2008 at 00:54.

  4. #4
    skimask's Avatar
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    Quote Originally Posted by jcleaver View Post
    i have attached the 2 programs one in pbp which reads temperature incorectly
    the other mikroe which works no hardware changes are made really interested in the difference


    thanks

    jack
    Speaking strictly about PBP....
    You know, just like it says in the manual, define's have to be in CAPS.
    Therefore, the
    define osc 20
    is ignored and the timing generated by the code is generated for an oscillator of 4mhz, but apparently you are running it at 20mhz, and therefore, probably far too fast.
    Did you write this code or copy/paste it? Why not use PBP's built-in OWIN/OWOUT commands?
    Last edited by skimask; - 23rd July 2008 at 02:41.

  5. #5
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    maybe you should check the math.
    With a change to the math the program works correctly. Running on a EasyPIC5 board.

    Sorry I was sleeping that day in class, so I can't explain why PBP and MBasic work differently.

  6. #6
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    Wink


    Why not use PBP's built-in OWIN/OWOUT commands?
    The solution simply is here ...

    MKB reads Byte by Byte and Pbp ... as you want !

    just need to program a correct reading with Pbp !



    Further ... TempF = TempC *9/5 + 32 ...

    Remember PbP works with UNSIGNED INTEGERS ...

    Alain

    PS: Ski, MKB has a built-in timing adjustment,( you check an option in the project window instead of writing a DEFINE ) and The "conversion complete" polling built-in. That surprised me a bit at first time, not to see it in the source listing ...
    Last edited by Acetronics2; - 23rd July 2008 at 09:01.
    ************************************************** ***********************
    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 " !!!
    *****************************************

  7. #7


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    Default attempt

    the osc is correct dont know why it did not show caps
    tried going with 4 still read low
    ? what changes in math
    TEMP = ((TEMP*9/5)+32 ) is what i am using
    thanks for the inputs

    have not found any samples using owin with this chip

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