DallasTemperature()
Create the DallasTemperature object, and initializes the OneWire object. DallasTemperature sensors(_oneWire, _pullupPin)sensors: a variable of type DallasTemperature.
_oneWire: pointer to OneWire created object.
_pullupPin: for strong pull-up is mandated in DS18B20 datasheet for parasitic * power (2 wires) setup. (DS18B20 datasheet, p. 7, section 'Powering the DS18B20') .
nothing