#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
#include <Servo.h>
Servo myservo; 
#include <RTClib.h>
RTC_DS1307 rtc;

#define ECHO_PIN 3
#define TRIG_PIN 4
#define vibrator 2
#define buzzer 5
int a = 0;
int tombol = A2;
int reset ;

byte detik = 0, menit = 0, jam = 0, flag = 0;

void setup() { 
  lcd.init();
  lcd.backlight(); 
  Serial.begin(9600); 
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(vibrator, OUTPUT);  
  pinMode(tombol, INPUT_PULLUP);  
  myservo.attach(11); 
  myservo.write(0); 
  rtc.begin();
  // Atur waktu RTC jika belum diset
  if (!rtc.begin()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  } 
}

void loop() {     
  // delay(800);
  bacaSensor();
  baca_tombol();
}

void bacaSensor(){   
// Baca waktu saat ini dari RTC
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print("Waktu: ");
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  lcd.print(now.minute(), DEC);
  lcd.print(":");
  lcd.println(now.second(), DEC);

  // Kondisi Pakan Penuh
  if (a == LOW){
    // Cek kondisi waktu dan atur pengendalian LED
    if (now.hour() == 01 && now.minute() == 59 && now.second() == 0){
    // Aktif Memberi Makan Ikan
    flag = 1;
    }

    if (flag == 1){
      digitalWrite(TRIG_PIN, LOW);
      delayMicroseconds(2);
      digitalWrite(TRIG_PIN, HIGH);
      delayMicroseconds(10);
      digitalWrite(TRIG_PIN, LOW);
      int duration = pulseIn(ECHO_PIN, HIGH);
      float distance = duration * 0.034 / 2;
      lcd.setCursor(0,1);
      lcd.print("Pakan: ");
      lcd.print(distance);
      lcd.print("cm");

      if (distance >= 0 && distance <= 100){
        myservo.write(90);              
        delay(15);
        digitalWrite (vibrator, HIGH);
        lcd.setCursor(0,2);
        lcd.print("Pakan masih ada");
      }
      if (distance > 100 && distance <= 130){
        myservo.write(30);              
        delay(15);
        digitalWrite (vibrator, HIGH);
        lcd.setCursor(0,2);
        lcd.print("Pakan mau habis");
      }
      if (distance >130){
        digitalWrite(vibrator, LOW);
        myservo.write(0);              
        delay(15);
        tone (buzzer, 120);
        delay(500);
        noTone(buzzer);
        lcd.setCursor(0,2);
        lcd.print("Pakan habis");
        lcd.setCursor(0,3);
        delay(1000);
        lcd.print("Segera isi pakan  ");
        delay(1000);
        lcd.setCursor(0,3);
        lcd.print("Geser tombol riset");
        delay(1000);
        lcd.clear();
      }  
    }

    if (now.hour() == 01 && now.minute() >= 60 && now.second() <= 00){
      flag = 0;
      digitalWrite(vibrator, LOW);
      myservo.write(0);              
      delay(15);
      tone (buzzer, 120);
      delay(500);
      noTone(buzzer);
      lcd.setCursor(0,2);
      lcd.print("Sudah diberi makan  ");
      delay(1000);
      lcd.setCursor(0,1);
      lcd.print("                    ");
      delay(1000);
    }

  if (a == HIGH){
    noTone(buzzer);
    lcd.setCursor(0,1);     
    lcd.print("Sistem Standby"); 
    }
  delay(1000);
  lcd.setCursor(0,2);
  lcd.print("                    ");
  lcd.setCursor(0,3);
  lcd.print("                    ");
  }
}
 
void baca_tombol(){
  reset = digitalRead(tombol);
  if (reset == LOW) {  
    a = 0;
  }
    if (reset == HIGH){
    digitalWrite(vibrator, LOW);
    myservo.write(0);              
    delay(15);
  a = 1;
  }
}