#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_MPU6050.h>
#include <DHT.h>
#include <WiFi.h>
#include <HTTPClient.h>


const char* ssid = "Wokwi-GUEST";
const char* password = "";


const char* server = "api.thingspeak.com";
const char* api_key = "HRHV0SG4TPEAE6LE";


#define LED_PIN 13
#define BUZZER_PIN 12
#define BUTTON_PIN 14
#define DHT_PIN 15
#define LDR_PIN 34


#define DHTTYPE DHT22
DHT dht(DHT_PIN, DHTTYPE);

Adafruit_MPU6050 mpu;

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


  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  dht.begin();

 
  if (!mpu.begin()) {
    Serial.println("Failed to find MPU6050 chip");
    while (1);
  }
  mpu.setAccelerometerRange(MPU6050_RANGE_16_G);
  mpu.setGyroRange(MPU6050_RANGE_250_DEG);
  mpu.setFilterBandwidth(MPU6050_BAND_21_HZ);

  
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi!");
}

void loop() {
 
  if (digitalRead(BUTTON_PIN) == LOW) {
    Serial.println("Crash detected!");
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    delay(1000);
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);

    sendAlert("Crash detected");
  }

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

  
  if (abs(a.acceleration.x) > 10 || abs(a.acceleration.y) > 10 || abs(a.acceleration.z) > 10) {
    Serial.println("Crash detected by accelerometer!");
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    delay(1000);
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);

    sendAlert("Crash detected by accelerometer");
  }

  
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" *C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");
  }

 
  int lightLevel = analogRead(LDR_PIN);
  Serial.print("Light level: ");
  Serial.println(lightLevel);


  static unsigned long lastSendTime = 0;
  if (millis() - lastSendTime > 20000) {
    lastSendTime = millis();
    sendDataToThingSpeak(temperature, humidity, lightLevel);
  }

  delay(100); 
}

void sendAlert(const char* message) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String("http://") + server + "/update?api_key=" + api_key + "&field1=" + message;

    http.begin(url);
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    Serial.println("WiFi Disconnected");
  }
}

void sendDataToThingSpeak(float temperature, float humidity, int lightLevel) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String("http://") + server + "/update?api_key=" + api_key +
                 "&field1=" + String(temperature) +
                 "&field2=" + String(humidity) +
                 "&field3=" + String(lightLevel);

    http.begin(url);
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    Serial.println("WiFi Disconnected");
  }
}