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Problem on DS18b20 returning values

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Sharagim

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Hi,
I have a circuit with DS18b20 . Then values which the sensor is returning is not correct.
for example when my reference (calibrated) sensor is showing 25.2 I am getting 25.7 from sensor, on 9 the sensor showing 12 and so on.
I cant use a constant value to calibrate it as you see it is not liner error. I was suspected which regulator heat making this error but when I make more distance between sensor and regulator same problem happening. I tried 3 different Sensor with different date codes and the error is same (not exactly but close). My mcu is xmega and I am at 32MHZ.

BR,
 

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