#include <ESP32Servo.h>

Servo servo;

int  trig = 18, echo = 5 ;
int pos = 0, distcm = 0;
void setup()
{
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  servo.attach(2);
}

void loop()
{
  for (pos = 0; pos <= 180; pos += 1)
  {
    servo.write(pos);
    delay(50);
    Serial.println(radar());
  }
  for (pos = 180; pos >= 0; pos -= 1)
  {
    servo.write(pos);
     delay(50);
    Serial.println(radar());   
  }
}
long radar(void)
{
  digitalWrite(trig, HIGH);
  delayMicroseconds(15);
  digitalWrite(trig, LOW);
  long  dur = pulseIn(echo, HIGH);
  distcm = dur / 58;
  return distcm;
}