#include <DS18B20.h>

#define LOW_ALARM 20
#define HIGH_ALARM 25

DS18B20 ds(2);
uint8_t address[] = {40, 250, 31, 218, 4, 0, 0, 52};
uint8_t selected;

void setup() {
  Serial.begin(9600);
  selected = ds.select(address);

  if (selected) {
    ds.setAlarms(LOW_ALARM, HIGH_ALARM);
  } else {
    Serial.println("Device not found!");
  }
}

void loop() {
  if (selected) {
    if (ds.hasAlarm()) {
      Serial.print("Warning! Temperature is ");
      Serial.print(ds.getTempC());
      Serial.println(" C");
    }
  } else {
    Serial.println("Device not found!");
  }

  delay(10000);
}