#include <OneWire.h>
#include <DallasTemperature.h>

const int oneWireBus = 4;    //GPIO 4

OneWire oneWire(oneWireBus);
DallasTemperature sensors(&oneWire);

void setup(){
sensors.begin();
}
void loop () {
sensors.requestTemperatures(); 
  float temperatureC = sensors.getTempCByIndex(0);
}