to compare it with mine and make the corrections..
Since you have a program, post your code using the CODE TAGS tool button.
I tried to understand and I made a research but I just running out of time...
Google "arduino ONEWIRE" You have to do your own research.
You obviously DID NOT do what I suggested here or you would be reading temps right now. Everyone on the forum knows that you are just one click away from reading temperature and you are still too lazy to do it...
I m trying to create a sketch but I can't.
That's rediculous. You won't. You have to approach it step by step. If you are running out of time I suggest you get busy.
Step-1
In this sketch when the program is starting up, pin 10, pin 11 & pin 12 is HIGH.
Step-2
Then the sensor will read the temp.
Step-3
and if the temp. is equal or bigger than 50 degrees Celsius
Step-4
then the pin 10 switch to LOW
Step-5
if the temp. is equal or bigger than 55 Celsius degrees
Step-61
then the pin 11 switch to LOW
Step-7
then the pin 12 switch LOW
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SITREP
The first thing we need is a SITREP (Mil-Speak for Situation Report)
We need to know exactly what steps you have taken toward reaching your objective.
In your case you project involves a DS18B20 temp sensor.
We need to know exactly how much you know about this sensor you have.
We need to see you post the datasheet as proof that you have seen it.
We need you to describe how you intend to connect this sensor to your arduino UNO (or have already done so).
We need to know what you have done toward getting the sensor to read data in to the arduino, specifically whether or not you have read in any temperatures. Nothing further will happen on your project until we get the SITREP.
NOTE-TO ALL OTHER FORUM MEMBERS -PLEASE WAIT UNTIL THE OP HAS POSTED HIS SITREP BEFORE POSTING ANYTHING.