#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  

float flamelevel = 0; 
#define redLED 2 
#define relayPin 5 // Define the pin connected to the relay module

const int firingHigh = 50; 
const int firingLOW = 5; 

unsigned long previousMillis = 0; // Variable to store the previous millis
const long interval = 500; // Interval for displaying "Danger" (in milliseconds)
bool displayDanger = false; // Variable to control displaying "Danger"
bool lampState = false; // Variable to control the lamp state

void setup() {
  lcd.init();
  lcd.clear();
  lcd.backlight();
  
  pinMode(redLED, OUTPUT); 
  digitalWrite(redLED, LOW); 

  pinMode(A2, OUTPUT);
  pinMode(relayPin, OUTPUT); // Set the relay pin as an output
  digitalWrite(relayPin, LOW); // Ensure the relay is initially off
}

void loop() 
{
  float analogValue = analogRead(A0);
  
  flamelevel = map(analogValue, 0, 1024, 100, 0);
 
  lcd.setCursor(0, 0);

  if ((flamelevel < firingHigh ) && ( flamelevel > firingLOW))
  { 
    lcd.clear();
    lcd.print("Risque");
    digitalWrite(relayPin, LOW); // Turn off the relay
    lampState = false; // Turn off the lamp
    digitalWrite(redLED, HIGH); 
    delay(300);
    digitalWrite(redLED, LOW); 
    delay(300);
  }

  if (flamelevel >= firingHigh) 
  { 
    unsigned long currentMillis = millis(); // Get the current time
    
    if (currentMillis - previousMillis >= interval) { // Check if it's time to toggle displayDanger
      displayDanger = !displayDanger; // Toggle displayDanger
      
      if (displayDanger) {
        lcd.clear();
        lcd.setCursor(3, 0); // Move cursor to the middle of the LCD
        lcd.print("Danger!!"); // Display "Danger"
        tone(A2, 1000, 700); // Play a tone at 5000 Hz for 2000 milliseconds (louder tone)
        digitalWrite(relayPin, HIGH); // Turn on the relay
        lampState = true; // Turn on the lamp
      } else {
        lcd.clear(); // Clear the LCD to hide "Dangerous"
        noTone(A2); // Stop the buzzer tone
        digitalWrite(relayPin, LOW); // Turn off the relay
        lampState = false; // Turn off the lamp
      }
      
      previousMillis = currentMillis; // Save the last time we toggled displayDanger
    }

    if (displayDanger) {
      digitalWrite(redLED, HIGH);
    } else {
      digitalWrite(redLED, LOW);
    }
  }

  if (flamelevel <= firingLOW) 
  {
    lcd.clear();
    lcd.print("Normal");
    digitalWrite(relayPin, LOW); // Turn off the relay
    lampState = false; // Turn off the lamp
    digitalWrite(redLED, LOW); 
  }
}