Program percobaan penggunaan RTC untuk trigger relay

arduino_RTC_relay.ino

/*
  Bismilla, percobaan RTC dan relay untuk my students.

*/

#include <DS3231.h>

//init rtc
DS3231  rtc(SDA, SCL);

// Init struktur Time-data
Time  t;

//definisi pin I/O yang dibutuhkan
const int led_1 = 13;
const int relay_1 = 7;


void setup()
{
  Serial.begin(115200);
  rtc.begin();

  pinMode(led_1, OUTPUT);
  digitalWrite(led_1, LOW);

  pinMode(relay_1, OUTPUT);
  digitalWrite(relay_1, LOW);

  // The following lines can be uncommented to set the date and time
  //rtc.setDOW(WEDNESDAY);     // Set Day-of-Week to SUNDAY
  //rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(1, 1, 2014);   // Set the date to January 1st, 2014
}

void loop()
{
  //data dari DS3231
  t = rtc.getTime();

  //untuk memonitor jam dari serial (boleh di disable)
  Serial.print(t.hour, DEC);
  Serial.print(":");
  Serial.print(t.min, DEC);
  Serial.print(":");
  Serial.print(t.sec, DEC);
  Serial.println("");

  //variabel waktu
  int jam = t.hour;
  int menit = t.min;
  int detik = t.sec;


  //sesuaikan jam, menit, dan detik dengan kebutuhan
  if (jam == 18 && menit == 10 && detik == 00) {
    digitalWrite(relay_1, HIGH);
    digitalWrite(led_1, HIGH);
    delay(2000);  //relay dan led indikator menyala selama 2 detik, silakan disesuaikan
    digitalWrite(relay_1, LOW);
    digitalWrite(led_1, LOW);
  }
  else
  {
    digitalWrite(relay_1, LOW);
    digitalWrite(led_1, LOW);
  }

  delay (1000);

}