#include <Wire.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>

Adafruit_MPU6050 mpu;

// Pins
#define PIR_PIN 2          // Helmet detection
#define MQ2_PIN 34         // Alcohol detection (analog)
#define RELAY_PIN 12       // Ignition control
#define BUZZER_PIN 14      // Crash alert

void setup() {
  Serial.begin(115200);
  
  pinMode(PIR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Initialize MPU6050
  if (!mpu.begin()) {
    Serial.println("MPU6050 not found. Check connections.");
    while (1);
  }

  Serial.println("Smart Helmet System Initialized.");
}

void loop() {
  bool helmetWorn = digitalRead(PIR_PIN);      // HIGH = motion detected = helmet worn
  int alcoholLevel = analogRead(MQ2_PIN);      // Simulated analog alcohol level
  bool sober = alcoholLevel < 3000;            

  if (helmetWorn && sober) {
    digitalWrite(RELAY_PIN, HIGH);             // Allow ignition
    Serial.println("Helmet worn and sober - Ignition ON");
  } else {
    digitalWrite(RELAY_PIN, LOW);              // Lock ignition
    if (!helmetWorn) Serial.println("Helmet not detected – Ignition locked");
    if (!sober) Serial.println("Alcohol detected – Ignition locked");
  }

  // Crash Detection
  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  float totalAccel = abs(a.acceleration.x) + abs(a.acceleration.y) + abs(a.acceleration.z);

  if (totalAccel > 30) {
    Serial.println("🚨 Crash detected! Please send SMS via phone app.");
    tone(BUZZER_PIN,1000);
    delay(1000);
    noTone(BUZZER_PIN);
    delay(1000);
  }

  delay(1000);
}