#define BLYNK_TEMPLATE_ID "TMPL3rRijLrha"
#define BLYNK_TEMPLATE_NAME "servo with ultrasonic"
#define BLYNK_AUTH_TOKEN "0W5mT5yhfJJyXyQk4yNssVabIXaQtuok"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>

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

Servo servo;

#define TRIGGER_PIN 12
#define ECHO_PIN 14

void setup() {
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  servo.attach(2); 
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  Blynk.run();
  long duration, cm;
  
  
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  
  duration = pulseIn(ECHO_PIN, HIGH);

  
  cm = (duration / 2) / 29.1;

  
  Blynk.virtualWrite(V1, cm);

  delay(200); 
}


BLYNK_WRITE(V0) {
  int servoPosition = param.asInt(); 
  servo.write(servoPosition); 
}