#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

int lm35Pin = A0;
int redLED = 3;
int yellowLED = 4;
int greenLED = 5;
int buzzer = 6;

void setup() {
  lcd.begin(16, 2);
  dht.begin();
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  float temp = analogRead(lm35Pin) * (5.0 / 1023.0) * 100.0; // LM35: 10mV/°C
  float hum = dht.readHumidity();

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print((char)223);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(hum);
  lcd.print("%   ");

  // Conditions
  bool tempHigh = temp > 35;
  bool humLow = hum < 40;

  if (tempHigh && humLow) {
    digitalWrite(buzzer, HIGH);
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
  } else if (tempHigh) {
    digitalWrite(redLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(greenLED, LOW);
    digitalWrite(buzzer, LOW);
  } else if (humLow) {
    digitalWrite(yellowLED, HIGH);
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, LOW);
    digitalWrite(buzzer, LOW);
  } else {
    digitalWrite(greenLED, HIGH);
    digitalWrite(redLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(buzzer, LOW);
  }

  delay(1000);
}