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

#define ONE_WIRE_BUS 4

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

void setup() {
  Serial.begin(115200);
  Serial.println("DS18B20 test!");
  sensors.begin();
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount());
  Serial.println(" device(s)");
}

void loop() {
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);

  if (tempC == DEVICE_DISCONNECTED_C) {
    Serial.println("Error: Could not read temperature");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(tempC, 2);
  Serial.println(" C");
  delay(1000);
}