#include <Wire.h>
#include <DS3231.h>

DS3231 clock;
RTCDateTime dt;
int alarmLED = 4;

void alarmFunction()
{
  digitalWrite(alarmLED, HIGH);
  delay(1000);
  digitalWrite(alarmLED, LOW);
  delay(1000);
}

void setup()
{
  Serial.begin(9600);

  // Initialize DS3231
  Serial.println("Initialize DS3231");;
  clock.begin();

  // Disarm alarms and clear alarms for this example, because alarms is battery backed.
  // Under normal conditions, the settings should be reset after power and restart microcontroller.
  clock.armAlarm1(false);
  clock.armAlarm2(false);
  clock.clearAlarm1();
  clock.clearAlarm2();

  // Set Alarm1 - Every 10s in each minute
  // setAlarm1(Date or Day, Hour, Minute, Second, Mode, Armed = true)
  clock.setAlarm1(0, 0, 0, 10, DS3231_MATCH_S);

  // Attach Interrput 0. In Arduino UNO connect DS3231 INT to Arduino Pin 2
  attachInterrupt(0, alarmFunction, FALLING);

  // Setup LED Pin
  pinMode(alarmLED, OUTPUT);
}

void loop()
{

}