Hi, Thanks a lot for your suggestion @boozz I've tried to connect the DS18B20 in parasite-powered mode. Now it is not warming anymore but the sensor is not detected by any example sketch I have tried (oneWireSearch, Single). @DrJeff I've tried your suggestion but it is not helping. My sensor still get warm. I have 5 sensors and all of them are behaving the same. I have also tried with another arduino but it had the same behavior. Here is a picture of my sensor. I believe everything is ok. I hope I didn't buy crap. Kind regards, Laurent