How many DS18B20 ? about arduino-temperature-control-library HOT 8 CLOSED

How are they wired? Are you using in parasitic mode? I would try adding a short delay between each reading. Also, you could check for -127 and if that's what you got, then read it again.

Here's a link to my function that I use to read 60 sensors: http://git.io/vt1x0

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Thanks for answer , three wires , no parasitic mode , readings every 15 minutes and this is strange. Becouse when reading is good (every 15 minutes) for nine DS18B20 and I connect tenth DS18B20 the readings are changening every second or 2 seconds. If something is wrong this strange reading should be every 15 minures.Should I set readings for example every 8 minutes for three DS18B20 , every 7 minutes for another three DS18B20........ Becouse now Arduino tries to read all ten DS18B20 every 15 miuntes.

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Does your code read all 10 at the same time? If so, I'd add a delay between each one; 100mS should be enough. I'm using 50 mS and that works pretty good.

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Thanks, I will change the code and check.

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More sensors implies the line is longer and you might need a smaller pull up resistor.
What value do you use now?

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I have 4,7 k ohm.

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Try a 3K3 or 2K2 when you have 10 sensors

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I tried 2,2 k ohm and it works perfect. Thanks a lot !!!!!!!

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