#define BLYNK_TEMPLATE_ID "TMPL3CWe5H1tG"
#define BLYNK_TEMPLATE_NAME "Ultrasonic"
#define BLYNK_AUTH_TOKEN "WwyxnpgJwCmn0QRa0UzWxFGNytFrm5GX"
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
 
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
 
//BlynkTimer timer;
 
 
#define BuzzerPin  12  //D12
#define trigPin 25
#define echoPin 26
int distance;
void setup()
{
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(BuzzerPin,OUTPUT);
 
  // Debug console
  Serial.begin(115200);
 
  Blynk.begin(auth, ssid, pass);
 
}
 
void loop()
{
  Blynk.run();
   // Clear the trigPin by setting it LOW:
  digitalWrite(trigPin, LOW);
  
  delayMicroseconds(5);
 
 // Trigger the sensor by setting the trigPin high for 10 microseconds:
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the echoPin. pulseIn() returns the duration (length of the pulse) in microseconds:
int  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance:
//  distance = duration*0.034/2;
  
distance = (duration/2) / 29.1;
  // Print the distance on the Serial Monitor (Ctrl+Shift+M):
int dist = map(distance,22,51, 100, 0);
 
  Serial.print("Distance = ");
  Serial.print(distance);
  Serial.println(" cm");
  Serial.println(dist);
  Blynk.virtualWrite(V0,dist);
  Blynk.virtualWrite(V1,distance);
   if (distance>45 ){
        digitalWrite(BuzzerPin, HIGH);
      Serial.println("Buzzer is turned on");
      }      
    
    if (distance <21){
     
        digitalWrite(BuzzerPin, LOW);
      
    }
}