// Fire Alarm System Code for Arduino
#include 

// Initialize LCD (RS, E, D4, D5, D6, D7)
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Pin Definitions
const int smokeSensorPin = A0;
const int manualCallPin = 7;
const int alarmBellPin = 8;
const int silenceButtonPin = 9;
const int resetButtonPin = 10;

// Variables
int smokeValue = 0;
bool alarmActive = false;
bool systemSilenced = false;

void setup() {
  // Initialize components
  pinMode(smokeSensorPin, INPUT);
  pinMode(manualCallPin, INPUT_PULLUP);
  pinMode(alarmBellPin, OUTPUT);
  pinMode(silenceButtonPin, INPUT_PULLUP);
  pinMode(resetButtonPin, INPUT_PULLUP);
  
  // LCD Setup
  lcd.begin(16, 2);
  lcd.print("FireGuardian 3000");
  lcd.setCursor(0, 1);
  lcd.print("System Ready");
  
  Serial.begin(9600);
}

void loop() {
  // Read sensor values
  smokeValue = analogRead(smokeSensorPin);
  bool manualTrigger = !digitalRead(manualCallPin);
  bool silencePressed = !digitalRead(silenceButtonPin);
  bool resetPressed = !digitalRead(resetButtonPin);
  
  // Check for fire condition
  if ((smokeValue > 300 || manualTrigger) && !systemSilenced) {
    triggerAlarm();
  }
  
  // Handle silence button
  if (silencePressed && alarmActive) {
    silenceAlarm();
  }
  
  // Handle reset button
  if (resetPressed) {
    resetSystem();
  }
  
  // Update LCD
  updateDisplay();
  delay(100);
}

void triggerAlarm() {
  alarmActive = true;
  digitalWrite(alarmBellPin, HIGH);
  lcd.clear();
  lcd.print("FIRE DETECTED!");
  lcd.setCursor(0, 1);
  lcd.print("EVACUATE AREA");
}

void silenceAlarm() {
  systemSilenced = true;
  digitalWrite(alarmBellPin, LOW);
  lcd.clear();
  lcd.print("ALARM SILENCED");
  lcd.setCursor(0, 1);
  lcd.print("AWAITING RESET");
}

void resetSystem() {
  alarmActive = false;
  systemSilenced = false;
  digitalWrite(alarmBellPin, LOW);
  lcd.clear();
  lcd.print("FireGuardian 3000");
  lcd.setCursor(0, 1);
  lcd.print("System Ready");
}

void updateDisplay() {
  if (!alarmActive) {
    lcd.setCursor(0, 1);
    lcd.print("Smoke: ");
    lcd.print(smokeValue);
    lcd.print("   ");
  }
}