The Horrible truth ...

Originally Posted by
fratello
B.t.w : what can I use instead of DS18B20 for more accurate measurement ?
Hi, Fratello
I had a look to all the sensors you can find on the market ...
The best "out of the box" accuracy ( all including ) will be roughly +/- 0.5 °C ... don't be sad !!!
going further needs multipoint CALIBRATION ... with some really expensive devices.
Note linearity is "not so bad" in our measuring range ... so, with a two points calibration ( 0 and 100°C ) , you can reach +/- 0.1 °C without too much pain.
And remember ... DS18x20 in continuous measurement mode like here, without being fixed on a heatsink, has a 1°C self heating value ... ( a look at the Datasheet will confirm !!! )
Just have a look to the values displayed from the power up ...
Alain
Last edited by Acetronics2; - 31st December 2008 at 09:58.
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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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