#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>
#include <NewPing.h>
ESP32PWM pwm;
Servo servo;

// Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Blynk authentication token

#define BLYNK_TEMPLATE_ID "TMPL3pdjhb4cs"
#define BLYNK_TEMPLATE_NAME "Smart door system ESP32"
#define BLYNK_AUTH_TOKEN "q1BW-AcuJpOFYpNezLrv0hHSBCC8avQi"
char auth[] = BLYNK_AUTH_TOKEN;

// Pins for ultrasonic sensor
#define TRIGGER_PIN 4
#define ECHO_PIN 2
#define MAX_DISTANCE 20

// Pins for servo motor and buzzer
#define SERVO_PIN 12
#define BUZZER_PIN 33

// Blynk virtual pins
#define DOOR_STATUS_PIN V0
#define DISTANCE_PIN V1

// Variables
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
int doorStatus = 0;

void setup()
{
  // Initialize Serial Monitor
  Serial.begin(115200);

  // Connect to Wi-Fi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize Blynk
  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);
  Serial.println("after blynk begin");
  // Initialize servo and set initial position
  servo.attach(SERVO_PIN);
  servo.write(90);

  // Set buzzer pin as output
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop()
{

  Blynk.run();
  checkDistance();
}

void checkDistance()
{
  // Read distance from the ultrasonic sensor
  int distance = sonar.ping_cm();

  // Update Blynk with the distance value
  Blynk.virtualWrite(DISTANCE_PIN, distance);

  // Check if someone is approaching the door too closely (adjust threshold as needed)
  if (distance < 20)
  {
    activateBuzzer();
  }
}

void activateBuzzer()
{
  // Sound the buzzer for a short duration
  tone(BUZZER_PIN, 1000, 500);
}

BLYNK_WRITE(DOOR_STATUS_PIN)
{
  Serial.println("in blynk write");
  // Update the door status variable
  doorStatus = param.asInt();

  // Control the servo motor based on the door status
  if (doorStatus == 20)
  {
    
    servo.write(90); // Open the door (adjust angle as needed)
  }
  else
  {
    servo.write(0); // Close the door
  }
}