#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#include <Servo.h>

#include <DHT.h>
#define DHTPIN 38
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Inisialisasi pin untuk perangkat
const int potensio_ph = 26;
const int potensio_DO = 27;
const int ultrasonicTriggerPin = 21;
const int ultrasonicEchoPin = 20;
const int led = 13;
const int buzzer = 14;
const int ledCount = 10;
int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 0, 1};
Servo servoMotor;

// Variabel untuk nilai sensor
int phValue;
int doValue;
float distance;

void setup() {
  // Inisialisasi perangkat
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(ultrasonicTriggerPin, OUTPUT);
  pinMode(ultrasonicEchoPin, INPUT);
  servoMotor.attach(16);

  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SYSTEM KONTROL DAN");
  delay(0);
  lcd.setCursor(0, 1);
  lcd.print("MONITORING KUALITAS");
  delay(0);
  lcd.setCursor(0, 2);
  lcd.print("AIR OTOMATIS");
  delay(5000);
  lcd.clear();

  dht.begin();

  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }

}

void loop() {
  // Membaca nilai potensiometer sebagai simulasi sensor
  phValue = analogRead(potensio_ph);
  doValue = analogRead(potensio_DO);

  // Konversi nilai sensor ke rentang float (1.0 - 10.0)
  float phDisplay = ((float)phValue / 1200.0) * 10;
  float doDisplay = ((float)doValue / 1200.0) * 10;

  // Konversi float ke string dengan 2 angka desimal
  //Logika sensor PH dan DO
  if (phDisplay < 4) {
  servoMotor.write(180);
  tone(buzzer, 1000, 200);
  digitalWrite(led, LOW);
} else if (phDisplay > 7) {
  servoMotor.write(0);
  tone(buzzer, 1000, 200);
  digitalWrite(led, HIGH);
} else if (doDisplay < 3 || doDisplay > 5) {
  servoMotor.write(0); // PH dalam rentang normal, hanya kontrol DO
  tone(buzzer, 1000, 200);
  digitalWrite(led, LOW);
} else {
  servoMotor.write(0); // Semua dalam rentang normal
  digitalWrite(led, LOW);
}

  // Membaca sensor ultrasonic
  digitalWrite(ultrasonicTriggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(ultrasonicTriggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(ultrasonicTriggerPin, LOW);
  float duration = pulseIn(ultrasonicEchoPin, HIGH);
  distance = (duration * 0.034) / 2;

  // Indikasi stok pupuk habis
  String fertilizerStatus = (distance > 10) ? "HABIS" : "TERSEDIA";

  // Membaca suhu
  float temp = dht.readTemperature();
  int ledLevel = map(temp, 20, 50, 0, ledCount);

  // loop over the LED array:
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    // if the array element's index is less than ledLevel,
    // turn the pin for this element on:
    if (thisLed < ledLevel) {
      digitalWrite(ledPins[thisLed], HIGH);
    }
    // turn off all pins higher than the ledLevel:
    else {
      digitalWrite(ledPins[thisLed], LOW);
    }
  }

  // Menampilkan data di LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PH Air : ");
  lcd.print(phDisplay);
  lcd.setCursor(0, 1);
  lcd.print("Oxygen : ");
  lcd.print(doDisplay);
  lcd.print(" mg");
  lcd.setCursor(0, 2);
  lcd.print("Suhu   : ");
  lcd.print(temp);
  lcd.print(" C");
  lcd.setCursor(0, 3);
  lcd.print("Pupuk  : ");
  lcd.print(fertilizerStatus);

  delay(1000);
}