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

#define MQ2_PIN 34
#define PIR_PIN 27
#define BUZZER 25
#define DHTPIN 4
#define DHTTYPE DHT22

Adafruit_MPU6050 mpu;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);

  pinMode(MQ2_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER, OUTPUT);

  dht.begin();

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

  Serial.println("Driver Monitoring System Started");
}

void loop() {

  // MQ2 Gas Sensor
  int gas = analogRead(MQ2_PIN);
  Serial.print("Gas: ");
  Serial.println(gas);

  if (gas > 2000) {
    Serial.println("Alcohol Detected!");
    digitalWrite(BUZZER, HIGH);
    delay(1000);
    digitalWrite(BUZZER, LOW);
  }

  // PIR Sensor
  int motion = digitalRead(PIR_PIN);

  if (motion == HIGH) {
    Serial.println("Driver Present");
  } else {
    Serial.println("No Driver!");
    digitalWrite(BUZZER, HIGH);
    delay(1000);
    digitalWrite(BUZZER, LOW);
  }

  // DHT22
  float temp = dht.readTemperature();

  Serial.print("Temp: ");
  Serial.println(temp);

  if (temp > 40) {
    Serial.println("High Temperature!");
    digitalWrite(BUZZER, HIGH);
    delay(1000);
    digitalWrite(BUZZER, LOW);
  }

  // MPU6050
  sensors_event_t a, g, temp2;
  mpu.getEvent(&a, &g, &temp2);

  Serial.print("Accel X: ");
  Serial.println(a.acceleration.x);

  if (abs(a.acceleration.x) < 0.5) {
    Serial.println("No Movement - Driver inactive");
    digitalWrite(BUZZER, HIGH);
    delay(1000);
    digitalWrite(BUZZER, LOW);
  }

  delay(2000);
}