#define BLYNK_TEMPLATE_ID "TMPL661eIT10S"
#define BLYNK_TEMPLATE_NAME "antitheft alarm"
#define BLYNK_AUTH_TOKEN "Li740Pi85P6jz-ZkgcWTDCQuTWxZ2-pL"


#include <ESP32Servo.h>
#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <WiFiClient.h>

char auth[] = BLYNK_AUTH_TOKEN ;
char ssid[] = "Wokwi-GUEST" ;
char pass[] = "";

#define TRIG_PIN  23  // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN  22  // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define SERVO_PIN 26  // ESP32 pin GIOP26 connected to Servo Motor's pin
#define DISTANCE_THRESHOLD  100 // centimeters
#define VPIN_switch_0 V0
#define VPIN_switch_1 V2
#define VPIN_switch_2 V3
#define VPIN_switch_3 V4
#define LED 12
Servo servo; // create servo object to control a servo

// variables will change:
float duration_us, distance_cm;
boolean original=true; 
int buzzerPin = 13;

BLYNK_WRITE(VPIN_switch_1) {
  int value1 = param.asInt();
  if (value1 == 0){ 
    original = true;
  }
}

BLYNK_WRITE(VPIN_switch_2) {
  int value2 = param.asInt();
  digitalWrite(LED, value2);
  Blynk.virtualWrite(VPIN_switch_2,value2);
}

BLYNK_WRITE(VPIN_switch_3) {
  int value3 = param.asInt();
  digitalWrite(buzzerPin, value3);
  Blynk.virtualWrite(VPIN_switch_3,value3);
}

void setup() {
  Serial.begin (9600);       // initialize serial port
  pinMode(TRIG_PIN, OUTPUT); // set ESP32 pin to output mode
  pinMode(ECHO_PIN, INPUT);  // set ESP32 pin to input mode
  pinMode(12,OUTPUT);
  servo.attach(SERVO_PIN);   // attaches the servo on pin 9 to the servo object
  servo.write(0);
  pinMode (buzzerPin, OUTPUT);
  Blynk.begin(auth, ssid, pass);
  Blynk.config(auth);
}

void loop() {
  Blynk.run();
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  // calculate the distance
  distance_cm = 0.017 * duration_us;

  Blynk.virtualWrite(VPIN_switch_0,distance_cm);
  if(original) {
    if (distance_cm < DISTANCE_THRESHOLD){
      servo.write(0); // rotate servo motor to 90 degree
      Blynk.virtualWrite(VPIN_switch_1,HIGH);
      digitalWrite(12, HIGH);
      Blynk.virtualWrite(VPIN_switch_2,HIGH);
      tone(buzzerPin, 300);
      Blynk.virtualWrite(VPIN_switch_3,HIGH);
      original=false;
    }
  else{
    servo.write(90);  // rotate servo motor to 0 degree
    noTone(buzzerPin);
  }  
  }


  // print the value to Serial Monitor
  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  delay(500);
}