#define BLYNK_TEMPLATE_ID "TMPL6u7D6xNfj"
#define BLYNK_TEMPLATE_NAME "Diploma Project Setup"
#define BLYNK_AUTH_TOKEN "ZoIKjjyNLbBZDO6_GEGXZRyAtJm6dQoN"


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

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

 int echoPIN = 2 ;
 int trigPIN = 15;
 int alarmPIN = 12; 
 int ledPIN = 18;   

unsigned long previousMillis = 0;
const long interval = 200; // Interval in milliseconds for updating the buzzer and LED


void setup() {
  pinMode(echoPIN, INPUT);   // Set Echo pin as input
  pinMode(trigPIN, OUTPUT);  // Set Trig pin as output
  pinMode(alarmPIN, OUTPUT);
  pinMode(ledPIN, OUTPUT);
  Serial.begin(9600);  // Initialize serial communication for debugging (optional)

  
  Blynk.virtualWrite(V0, echoPIN);
  Blynk.virtualWrite(V1, ledPIN);
  Blynk.virtualWrite(V2, alarmPIN);

  Blynk.begin(auth,ssid,pass);

}

void loop() {
  Blynk.run();
  // Trigger the ultrasonic sensor
  digitalWrite(trigPIN, LOW);
  delayMicroseconds(2000);
  digitalWrite(trigPIN, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPIN, LOW);

  // Read the value from the ultrasonic sensor
  int distance = pulseIn(echoPIN, HIGH) / 58.800;
  Blynk.virtualWrite(V0, distance);

  // Check if it's time to update the buzzer and LED
  

    // Object detected within 200cm or less
    if (distance > 0 && distance <= 25) {
      tone(alarmPIN, 25000);  // Turn on the buzzer
      digitalWrite(ledPIN, HIGH);    // Turn on the LED
      delay(500);
     digitalWrite(ledPIN, LOW);
      Blynk.virtualWrite(V1, HIGH); 
      Blynk.virtualWrite(V2, HIGH);
    } else {
      // No object detected within 200cm
      noTone(alarmPIN);  // Turn off the buzzer
      digitalWrite(ledPIN, LOW);     // Turn off the LED
      Blynk.virtualWrite(V1, LOW); 
      Blynk.virtualWrite(V2, LOW);
    }
 
  }