#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

const int heaterPin = 13;         
const int ledPin = 9;             
const int buttonStartPin = 2;     
const int buttonStopPin = 3;     
const int buttonUpPin = 4;        
const int buttonDownPin = 5;      
const int DHTPin = 7;             
const int DHTType = DHT22;       

DHT dht(DHTPin, DHTType);

int targetTemperature = 35;       
int targetHumidity = 40;          
float currentTemperature = 0.0;   
float currentHumidity = 0.0;      
int screenMode = 0;               
LiquidCrystal_I2C lcd(0x27, 20, 4); 

void setup() {
  pinMode(heaterPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buttonStartPin, INPUT_PULLUP);
  pinMode(buttonStopPin, INPUT_PULLUP);
  pinMode(buttonUpPin, INPUT_PULLUP);
  pinMode(buttonDownPin, INPUT_PULLUP);
  Serial.begin(9600);
  lcd.init();              
  lcd.backlight();                
  dht.begin();                  
  lcd.setCursor(5, 1);
  lcd.print("Inkubator");
  lcd.setCursor(7, 2);
  lcd.print("Bayi");
  delay(2000);
  lcd.clear();
}
void loop() {
  currentTemperature = dht.readTemperature();
  currentHumidity = dht.readHumidity();
  // Menampilkan informasi di LCD
  switch (screenMode) {
    case 0: // Mode Atur Suhu
      lcd.setCursor(5, 1);
      lcd.print("Set Temp: ");
      lcd.setCursor(7, 2);
      lcd.print(targetTemperature);
      lcd.print(" C  ");
      break;
    case 1: // Mode Atur Kelembaban
      lcd.setCursor(3, 1);
      lcd.print("Set Humidity: ");
      lcd.setCursor(7, 2);
      lcd.print(targetHumidity);
      lcd.print("%");
      break;
    case 2: // Mode Baca Suhu dan Kelembaban
      lcd.setCursor(0, 0);
      lcd.print("Temp : ");
      lcd.print(currentTemperature);
      lcd.print(" C      ");

      lcd.setCursor(0, 1);
      lcd.print("Humidity: ");
      lcd.print(currentHumidity);
      lcd.print("%");

      lcd.setCursor(0, 2);
      lcd.print("Target  : ");
      lcd.print(targetTemperature);
      lcd.print(" C");

      lcd.setCursor(0, 3);
      lcd.print("Press Stop to stop");
      break;
  }
  // Tombol Start
  if (digitalRead(buttonStartPin) == LOW) {
    if (screenMode == 0) {
      screenMode = 1; 
    } else if (screenMode == 1) {
      screenMode = 2; 
    } else if (screenMode == 2) {
      turnOnHeater(); 
    }
    delay(200); 
  }
  // Tombol Stop
  if (digitalRead(buttonStopPin) == LOW) {
    if (screenMode == 2) {
      turnOffHeater(); 
      screenMode = 0; 
    }
    lcd.clear();
    delay(200); 
  }
  // Tombol Up
  if (digitalRead(buttonUpPin) == LOW) {
    if (screenMode == 0) {
      if (targetTemperature < 40) {
        targetTemperature++;
      }
    } else if (screenMode == 1) {
      if (targetHumidity < 60) {
        targetHumidity++;
      }
    }
    delay(200); 
  }
  // Tombol Down
  if (digitalRead(buttonDownPin) == LOW) {
    if (screenMode == 0) {
      if (targetTemperature > 35) {
        targetTemperature--;
      }
    } else if (screenMode == 1) {
      if (targetHumidity > 40) {
        targetHumidity--;
      }
    }
    delay(200); 
  }
}
void turnOnHeater() {  
  if (currentTemperature < targetTemperature) {
    digitalWrite(ledPin, HIGH);
    digitalWrite(heaterPin, HIGH); 
  }
}
void turnOffHeater() {    
  if (currentTemperature >= targetTemperature) {
    digitalWrite(ledPin, LOW); 
    digitalWrite(heaterPin, LOW); 
  }  
}