I have calibrated a ds1820 probe so it will give more accurate readings. I used a lab calibrated thermometer to make a calibration curve. By knowing the readings vs true readings I can manipulate the out put to show the true readings. My question is, If I put the DS1820 on a diffrent arduio running the same code, will the readings yeild diffrent results? Forget about the calibration, I just want to know if the readings will differ from arduio to arduino useing the same sample and probe? Hope this makes sense. TIA
If everything is working properly, no. It's digital and the data will be the same.
If something goes wrong it will likely be VERY wrong and obvious.
Of course, a different probe/sensor my read differently because there is an internal analog temperature sensor before an analog-to-digital converter.
Could you describe a situation in which you think that would be likely to happen? After a quick read through the datasheet I'm unable to think of one.
To "calibrate" my DS18B20s I usually just apply an offset correction at ice point (0℃), would be interested to see your method of calibration. Please post your code.
take a reading at about 40C record the NIST thermometer reading and the corrosponding arduino reading, do the same for ice slurry, useing y=mx+b , I can get a corrected reading. Is overkill but I cant help[ myself, your right a siample correction factor would be more than enought for my purposes
Of course they will, probably not measurable, but maybe they will be. Nothing made of natural elements is "the same," that is why you must always calibrate.
Understood. 
Read the datasheet and look for a dependancy on the input voltage, or other parameters.USB 5 volt" varies, You used that.
To the extent that the '1820 is dependent on +V
DS18B20 has always worked well for me from 3V ~ 5.5V, never had any of the problems I frequently see on the forum. I may be just lucky ...... NAH.
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