#define BLYNK_PRINT Serial


#define BLYNK_TEMPLATE_ID "TMPL6bOR-OTan"
#define BLYNK_TEMPLATE_NAME "JKJKJKJKJK"
#define BLYNK_AUTH_TOKEN "gkNqfA2rScfLd26cweg33LdciYnhkqDm"


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


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

#define t 15
#define e 4
#define b 2
long echo;
float distance;

void setup() {
  Serial.begin(9600);
  pinMode(t, OUTPUT);
  pinMode(e, INPUT); 
  pinMode(b, OUTPUT); 
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}


void loop() {
  Blynk.run();
  readSensor();
}
long pre=0;
void readSensor(){
int vr1;
     if(millis()-pre>2000){
        pre = millis();
          digitalWrite(t, LOW);
  delay(10);
  digitalWrite(t, HIGH);
  delayMicroseconds(10);  
  digitalWrite(t,LOW);
  echo=pulseIn(e,HIGH);
  distance=(echo/2.0)/29.0;
        Blynk.virtualWrite(V0,distance);   
        if(distance<20){
           Blynk.virtualWrite(V1,1);
           digitalWrite(b, HIGH);
         }else{
           Blynk.virtualWrite(V1,0);
           digitalWrite(b,LOW);
         }  
        Serial.println(distance);
     }
}