//  Temperature Control System
 #include <LiquidCrystal_I2C.h>
int buzzer = 11; 
 const float BETA = 3950;
LiquidCrystal_I2C lcd(0x27,20,4);
 float temperatureC_ForSensor1 = 0.0; 
float temperatureC_ForSensor2 = 0.0;
void setup() {  
   // put your setup code here, to run once: 
     Serial.begin(9600);  
      pinMode(LED_BUILTIN, OUTPUT);
  lcd.begin(16, 2);  
   lcd.print("WELCOME TO");   
   lcd.setCursor(0,1);  
    lcd.print("FIRE ALARM");
  delay(2000); }
void loop() {   // put your main code here, to run repeatedly:
  int analogValueFromSensor1 = analogRead(A0); 
    int analogValueFromSensor2 = analogRead(A1);
    Serial.println("From Flame Detector Sensor 1");
    float temperatureC_ForSensor1 = 1 / (log(1 / 
(1023. / analogValueFromSensor1 - 1)) / BETA + 1.0 / 
298.15) - 273.15;
    Serial.print("Flame Temperature: ");    
     Serial.print(temperatureC_ForSensor1);
    Serial.println(" ℃");
    Serial.println("From Flame Detector Sensor 2");
    float temperatureC_ForSensor2 = 1 / (log(1 / 
(1023. / analogValueFromSensor2 - 1)) / BETA + 1.0 / 
298.15) - 273.15;
    Serial.print("Flame Temperature: ");   
      Serial.print(temperatureC_ForSensor2);
    Serial.println(" ℃");     delay(1000);
  if (temperatureC_ForSensor1 > 40) {     tone(buzzer, 450);
    delay(500);     noTone(buzzer);     // delay(100);         lcd.begin(16, 2);     lcd.print("FIRE!! FIRE!! in");     lcd.setCursor(0,1);     lcd.print("SECTION 1");
    digitalWrite(LED_BUILTIN, HIGH); 
    delay(1000);   }
  if (temperatureC_ForSensor2 > 40) {     tone(buzzer, 450);   
    delay(500);    
     noTone(buzzer);     // delay(100);
    lcd.begin(16, 2);   
      lcd.print("FIRE!! FIRE!! in");  
         lcd.setCursor(0,1);
         lcd.print("SECTION 2");
    digitalWrite(LED_BUILTIN,  HIGH);     delay(1000); 
  }
  if((temperatureC_ForSensor1 > 20 && 
temperatureC_ForSensor1 < 40) && (temperatureC_ForSensor2 > 20 && temperatureC_ForSensor2 < 40)) {    
   delay(1000);   
     digitalWrite(LED_BUILTIN, LOW);   
       lcd.begin(16, 2);     
       lcd.print("SAFE AREA");    
        delay(500); 
            lcd.begin(16, 2);
    delay(500);   
      lcd.print("WELCOME TO");  
         lcd.setCursor(0,1); 
             lcd.print("FIRE ALARM");    
              delay(500); 
                }
}