#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <MPU6050.h>
#include <DHT.h>

#define DHTPIN 7
#define DHTTYPE DHT22
#define BUZZER 12
#define LED 13

LiquidCrystal_I2C lcd(0x27, 16, 2);
MPU6050 mpu;
DHT dht(DHTPIN, DHTTYPE);

const int threshold = 15;  // Earthquake sensitivity

void setup() {
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();

  pinMode(BUZZER, OUTPUT);
  pinMode(LED, OUTPUT);

  // Step 1: Show startup message
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Quake Eye Ready");
  delay(3000);

  // Step 2: Calibrating message
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Calibrating...");
  delay(1000);

  // Step 3: Two beep-light signals
  for (int i = 0; i < 2; i++) {
    digitalWrite(LED, HIGH);
    tone(BUZZER, 1000, 200);
    delay(300);
    digitalWrite(LED, LOW);
    noTone(BUZZER);
    delay(300);
  }

  // Initialize sensors
  mpu.initialize();
  dht.begin();

  // System ready for live monitoring
  lcd.clear();
  lcd.print("System Operational");
  delay(1000);
  lcd.clear();
}

void loop() {
  // --- Read MPU6050 Acceleration ---
  int16_t ax, ay, az;
  mpu.getAcceleration(&ax, &ay, &az);
  int X = ax / 100;
  int Y = ay / 100;
  int Z = az / 100;

  // --- Read DHT22 Temperature & Humidity ---
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // --- Display Live Data on LCD ---
  lcd.setCursor(0, 0);
  lcd.print("X:");
  lcd.print(X);
  lcd.print(" Y:");
  lcd.print(Y);
  lcd.print(" Z:");
  lcd.print(Z);





  // --- Earthquake Detection ---
  if (abs(X) > threshold || abs(Y) > threshold || abs(Z) > threshold) {
    lcd.setCursor(0, 1);
    lcd.print("Earthquake Alert ");
    digitalWrite(LED, HIGH);
    tone(BUZZER, 1000);
    delay(200);
    digitalWrite(LED, LOW);
    delay(200);
  }
  
  else {

    // When stable, show live T & H again
    lcd.setCursor(0, 1);
    lcd.print("T:");
    lcd.print(temp, 1);
    lcd.print("C H:");
    lcd.print(hum, 0);
    lcd.print("% ");
    noTone(BUZZER);
    digitalWrite(LED, LOW);
    
    
    
  }

  delay(500);
}