ds18s20 reads incorectly

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  1. - 22nd July 2008, 19:22 #1
    jcleaver's Avatar
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    Cool ds18s20 reads incorectly

    i have tried several programs on this and several other sites to read temperature
    read a lot of posts on the subject and have been able to get most to function
    however the temperature readings are all low aprox 30 deg f this is only happening when i use pbp

    tried mikro and works perferct what the difference??
  2. - 22nd July 2008, 19:28 #2
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    Cool

    Quote Originally Posted by jcleaver View Post
    i have tried several programs on this and several other sites to read temperature
    read a lot of posts on the subject and have been able to get most to function
    however the temperature readings are all low aprox 30 deg f this is only happening when i use pbp
    tried mikro and works perferct what the difference??
    What's the difference? Plenty...signed vs un-signed integers is a good possibility for one thing...
    We might be able to help you out a bunch better if you were to post one of those 'several' programs from one of those 'several' sites...
    Or a search here reveals:
    http://www.picbasic.co.uk/forum/showthread.php?t=5349
    http://www.picbasic.co.uk/forum/showthread.php?t=7091
    just for a couple of examples...
    http://www.picbasic.co.uk/forum/showthread.php?t=7079
    http://www.rentron.com/PicBasic/PBP1-wire.htm
    Last edited by skimask; - 22nd July 2008 at 19:31.
  3. - 22nd July 2008, 19:54 #3
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    Default program

    thanks for the prompt responce
    http://www.rentron.com/PicBasic/one-wire3.htm
    using this program with changes made for a different type of display
    noticed it used the 18d20 but cant seem to find a program that uses the 18s20
    nor after looking over several posts can i come up with the correct way to read this
  4. - 22nd July 2008, 20:15 #4
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    Lightbulb

    Hi,

    Just look at programs for DS1820 ...

    or compare the " Operation measuring temp " chapters of DS18B20 and DS18S20

    You will find a correct program for DS1820 in The Parallax Stamp applications ...

    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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    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  5. - 22nd July 2008, 21:34 #5
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    Default Update

    Finally Got It Working Better
    Thanks For The Inputs
    Notice I Said Better Still Reads 10 F Deg Low
    But Better Really Dont Understand Why Mikroe Works Perfectly With The Same
    Hardware Using Pbp 5.0 And Mcsp 3.0
    Must Be Some Difference In The Complier No? Maybe?
  6. - 22nd July 2008, 21:53 #6
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    Default

    I posted a program that reads DS18S20s. I have 4 of them on onewire and I read them with no problem and I use PBP.
    I do not expect temps below zero so I have not made allowances for that.

    http://www.picbasic.co.uk/forum/showthread.php?t=9116
  7. - 22nd July 2008, 21:54 #7
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    Default

    Hi jcleaver,

    You might want to check Maxim forum at:

    http://discuss.dalsemi.com/index.php?

    They had rejects on DS1820 family showing wrong temperature and there is a fix for it.

    Nick
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