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

#define EMF_SENSOR_PIN 34  // Potentiometer (simulating EMF signal)
#define LED_PIN 26         // LED to indicate phone detection
#define BUZZER_PIN 27      // Buzzer to alert detection
#define THRESHOLD 300      // EMF detection threshold (adjust as needed)

LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD address (0x27) and size (16x2)

void setup() {
  // Start I2C communication and initialize LCD
  Wire.begin();
  lcd.begin(16, 2);          // Initialize the LCD with 16 columns and 2 rows
  lcd.backlight();           // Turn on the LCD backlight

  // Set pin modes
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(EMF_SENSOR_PIN, INPUT);

  // Display welcome message
  lcd.setCursor(0, 0);
  lcd.print("Welcome to the");
  lcd.setCursor(0, 1);
  lcd.print("Home of Phone Detector");

  delay(2000);  // Wait for 2 seconds to display the welcome message
  lcd.clear();  // Clear the screen after the welcome message
}

void loop() {
  // Read the potentiometer value (simulating EMF sensor)
  int emfValue = analogRead(EMF_SENSOR_PIN);

  // Display the EMF value on LCD
  lcd.setCursor(0, 0);
  lcd.print("EMF Level: ");
  lcd.print(emfValue);

  // Check if the EMF value exceeds the threshold (simulating phone detection)
  if (emfValue > THRESHOLD) {
    lcd.setCursor(0, 1);
    lcd.print("Phone Detected!");

    // Activate the LED and Buzzer
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    delay(500); // Wait for 500ms
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  } else {
    lcd.setCursor(0, 1);
    lcd.print("No Phone Found");
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(500); // Delay between readings
}