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

#define relay1 25
#define relay2 26
#define relay3 27
#define DHTPIN 14
#define DHTTYPE DHT22

int mode = 0;
LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows
DHT dht(DHTPIN, DHTTYPE);

void setup(){
  Serial.begin(9600);
  dht.begin();     // initialize the sensor
  lcd.init();      // initialize the lcd
  lcd.backlight(); // open the backlight 
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);

  nyala_awal ();
  delay (1000);

  lcd.setCursor(0,0);
  lcd.print("Pilih Mode :");
  lcd.setCursor(0,1);
  lcd.print("1.auto 2.manual");
  while (!Serial.available()) {
    // Tunggu sampai ada data yang tersedia di buffer serial
  }
  char data = Serial.read();
  if (data == '1'){
    mode = 1;
    Serial.println("Masuk ke mode otomatis");
  } else if (data == '2'){
    mode = 2;
    Serial.println("Masuk ke mode manual");
  }
  lcd.clear();

  if (mode == 1){
    otomatis();
  } else if (mode == 2){
    manual();
  }
  lcd.clear();
}

void loop(){
  delay(100);
// PEMBACAAN SUHU
  int tempC = dht.readTemperature(); // read temperature
  lcd.setCursor(0, 0);  // start to print at the first row
  lcd.print("Temp: ");
  lcd.print(tempC);     // print the temperature
  lcd.print((char)223); // print ° character
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("FAN : ");

  if (mode == 1){
    otomatis();
  } else if (mode == 2){
    manual();
  }
  
 }

void manual (){
  if (Serial.available () > 0){
    char state = Serial.read();

    if (state == '1'){
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("1");
    }
    else if (state == '2'){
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("2");      
    }
    else if(state == '3'){
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, HIGH);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("3");
    }
    else if (state == '4'){
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("OFF");
    }
  }
}
void otomatis (){
  lcd.clear();
    int tempC = dht.readTemperature(); // read temperature
    lcd.setCursor(0, 0);  // start to print at the first row
    lcd.print("Temp: ");
    lcd.print(tempC);     // print the temperature
    lcd.print((char)223); // print ° character
    lcd.print("C");

  // check if any reads failed
    if (isnan(tempC)) {
    lcd.setCursor(0, 0);
    lcd.print("Failed");
  } else if (tempC <= 28){
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("OFF");
  } else if (tempC >= 28 && tempC <= 31) {
    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("1");
  } else if (tempC >= 31 && tempC <= 34) {
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("2");
  }
  else if (tempC >= 34) {
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, HIGH);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("3");
    }
}

void nyala_awal () {
    int tempC = dht.readTemperature(); // read temperature
    lcd.setCursor(0, 0);  // start to print at the first row
    lcd.print("Temp: ");
    lcd.print(tempC);     // print the temperature
    lcd.print((char)223); // print ° character
    lcd.print("C");
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
    lcd.setCursor(0,1);
    lcd.print("FAN : ");
    lcd.println("READY");
}