//#define WOKWI_SIMULATION
 
//#ifdef WOKWI_SIMULATION
//#include <Arduino.h>
//#else
//#define BLYNK_TEMPLATE_ID "TMPL3rK8_6WUV"
//#define BLYNK_TEMPLATE_NAME "LED Blink"
//#define BLYNK_AUTH_TOKEN "Wc1uFUswL_OsyYSZwqEkJ8-ryh-0lBpz"

#define BLYNK_TEMPLATE_NAME "VR NAVIGATION  MODEL FOR VISUALLY IMPAIRED"
#define BLYNK_AUTH_TOKEN "X7GREpXeilOXpQ8CZS2RlujYNkGyPKfP"
#define BLYNK_TEMPLATE_ID "TMPL3oPA-6a8V"
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
//#include <Simpletimer.h>
//#endif
 
#define TRIG_PIN 12
#define ECHO_PIN 13
#define BUZZER_PIN 14
 
//#ifndef WOKWI_SIMULATION
char auth[] = "X7GREpXeilOXpQ8CZS2RlujYNkGyPKfP";
char ssid[] = "Wokwi-GUEST";  
char pass[] = "";  
BlynkTimer timer;
//#endif
 
long distance;
 
void sendDistanceToBlynk() {
//#ifndef WOKWI_SIMULATION
  // Ensure distance is within the range 1 to 50 cm
  distance = constrain(distance, 1, 50);
  Blynk.virtualWrite(V2, distance);
//#endif
}
 
void setup() {
  Serial.begin(115200);
  Serial.println("Starting...");
 
//#ifdef WOKWI_SIMULATION
  Serial.println("Wokwi simulation started");
//#else
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
 
  Serial.println("Connecting to Blynk...");
  Blynk.begin(auth, ssid, pass); // Initialize Blynk connection
  while (!Blynk.connect()) {
    Serial.println("Retrying Blynk connection...");
    delay(1000);
  }
  Serial.println("Blynk connected");
 
  timer.setInterval(1000L, sendDistanceToBlynk);  // Update Blynk every second
//#endif
 
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}
 
void loop() {
//#ifndef WOKWI_SIMULATION
Blynk.run();
//timer.run();
//#endif
 
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
 
  long duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2;
 
//#ifdef WOKWI_SIMULATION
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
//#endif
 
  if (distance < 50) {
    tone(BUZZER_PIN, 1000);
    delay(1000);
  } else {
    noTone(BUZZER_PIN);
    delay(1000);
  }
  delay(100);
}