Please help with code for DS18B20

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  1. - 13th January 2009, 16:10 #1
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    fratello
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    Thanks for reply !
    Sorry, but my LCD is 2 x 16 ; at first line I display "In" and at second "Out" values of temperatures. Otherwise, nice code are You writing .
  2. - 13th January 2009, 20:46 #2
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    New problem :
    -the thermometer PIC 12F675 + DS18B20 + Nokia LCD = 24.5 'C
    -the thermometer LM 35DZ + Fluke 830DM = 24.5 'C
    -the thermometer PIC 16F628A + DS18B20 = 25.5 ' C !!!!!!!!!!!

    I try to write in PIC the same code of themperature conversion like Mr.Novakovic Ivica.
    Check for similarity !!!! Why this diference ? I thing I go crazy, soon ....
    Attached Files Attached Files
  3. - 13th January 2009, 20:53 #3
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    Hi,

    Code:
    count_remain, count_per_c
    DO NOT use that with DS 18B20 ....

    That's a first step.

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  4. - 14th January 2009, 09:21 #4
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    Anything code I write in thermo that I made, the temperatures are NOT similar with those measured with other devices (mentioned). I try to change the sensor (I use three !) but nothing change. I don't know what to believe : which of temperature is - more- accurate ?
  5. - 14th January 2009, 10:16 #5
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    I found this on forum :
    "OSCCON = %01100000 'Internal clock set to 4-MHz (MUST DO THIS!!!)"
    I added in my code, but PBP say "Error : Undefined Symbol 'OSCCON'.
    Maybe this is the error that shows different temperatures ?
  6. - 14th January 2009, 10:55 #6
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    Have you checked your PICs DATASHEET to see if it has an OSCCON register?
  7. - 14th January 2009, 16:30 #7
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    My mistake...mea culpa...
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