int trig = 12;
int echo = 13;
int led1 = 5;
int led2 = 16;
int led3 = 4;
int distance ;

void setup() {
  // put your setup code here, to run once:
  Serial.println(115200);
  Serial.println("HELLO, ESP32!");
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

}
void loop() {
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  int reading = (pulseIn(echo, HIGH));
  distance = (reading*0.034/2);
  Serial.println("ok, recived");
  Serial. println(distance);
  if (distance<100)
  {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    Serial.println("on");
  }
   else if ( distance < 200)
   { digitalWrite(led1, LOW);
   digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
   Serial.println("on");
   }
   else if ( distance <300 )
   { digitalWrite( led1 , LOW);
   digitalWrite(led2, LOW);
    digitalWrite(led3,HIGH);
     Serial.println( "on");
     }


}