const int lm35_pin = A0;  /* LM35 O/P pin */
#define Heater 7
#define Fan 8
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define LCD_ADDRESS 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
}

void loop() {
  int temp_adc_val;
  float temp_val;
  temp_adc_val = analogRead(lm35_pin);  /* Read Temperature */
  temp_val = (temp_adc_val * 4.88); /* Convert adc value to equivalent voltage */
  temp_val = (temp_val / 100); /* LM35 gives output of 10mv/°C */
  Serial.print("Temperature = ");
  Serial.print(temp_val);
  Serial.print(" Degree Celsius\n");
  lcd.clear();
  lcd.print("Temp = ");
  lcd.print(temp_val);
  lcd.print(" *C");
  if (temp_val <= 24.00) {
    digitalWrite(Heater, HIGH);
    digitalWrite(Fan, LOW);
    lcd.clear();
    lcd.print("Temp = ");
    lcd.print(temp_val);
    lcd.print(" *C");
    lcd.setCursor(0, 1);
    lcd.print("HEATING");

  }
  else if (temp_val >= 26.00) {
    digitalWrite(Heater, LOW);
    digitalWrite(Fan, HIGH);
    lcd.clear();
    lcd.print("Temp = ");
    lcd.print(temp_val);
    lcd.print(" *C");
    lcd.setCursor(0, 1);
    lcd.print("COOLING");
  }
  delay(1000);
}