#include<ESP32Servo.h>
Servo myServo;
int trig=15;
int echo=4;
int threshold=300;
void setup(){
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  myServo.attach(4);
  Serial.begin(9600);
}
void loop(){
  digitalWrite(trig,0);
  delayMicroseconds(2);
  digitalWrite(trig,1);
  delayMicroseconds(10);
  digitalWrite(trig,0);
  float duration=pulseIn(echo,1);
  duration=duration/2;
  float distance=(0.034)*duration;
  Serial.println(distance);
  if(distance>threshold){
    Serial.println("servo motor is on");
    myServo.write(90);
  }
  else{
     Serial.println("servo motor is off");
     myServo.write(0);
  }
}