#include <LiquidCrystal.h>

const int rs = 9, en = 8, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int LM35 = A0, buzzer = 7, ledg =11, ledy = 12, ledr = 13, relay = 6;
float nilailm35;
float vout;
float tempc;
float tempf;

void setup() 
{
  pinMode(LM35, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(relay, OUTPUT);
  pinMode(ledg, OUTPUT);
  pinMode(ledy, OUTPUT);
  pinMode(ledr, OUTPUT);
  
  lcd.clear();
  lcd.begin(16, 2);
}

void loop() 
{
  nilailm35 = analogRead(LM35);

  vout  = nilailm35 / 1023 * 5;
  tempc = vout * 100;
  tempf = (tempc * 1.8) + 32;


  if (tempc <= 10) 
  {
    digitalWrite(ledr, LOW);
    digitalWrite(ledy, LOW);
    digitalWrite(ledg, HIGH);
    digitalWrite(buzzer, LOW);

    lcd.setCursor(0, 0);
    lcd.print("StempC:");
    lcd.print(tempc);
    lcd.print("'C");

    lcd.setCursor(0, 1);
    lcd.print("StempF:");
    lcd.print(tempf);
    lcd.print("'F");
  }
  else if (tempc <= 34) 
  {
    digitalWrite(ledr, LOW);
    digitalWrite(ledy, HIGH);
    digitalWrite(ledg, LOW);
    digitalWrite(buzzer, LOW);

    lcd.setCursor(0, 0);
    lcd.print("StempC:");
    lcd.print(tempc);
    lcd.print("'C");

    lcd.setCursor(0, 1);
    lcd.print("StempF:");
    lcd.print(tempf);
    lcd.print("'F");
  }

  else if (tempc >= 36) 
  {
    digitalWrite(ledr, HIGH);
    digitalWrite(relay, LOW);
    digitalWrite(ledr, LOW);
    digitalWrite(ledy, LOW);   
    digitalWrite(ledg, LOW);  
    digitalWrite(buzzer, HIGH); 

    lcd.setCursor(4, 0);
    lcd.print("INFORMASI");
    lcd.setCursor(2,1);
    lcd.print("AIRNYA MENYALA");
  }

  delay(2000);
}