int trig = 26;
int echo = 27;
int distance;




void setup() {

  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trig, OUTPUT);
  pinMode(echo,INPUT);
  pinMode(23, OUTPUT);
  pinMode(22,OUTPUT);
  pinMode(21,OUTPUT);
}

void loop() {
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  int reading = pulseIn(echo,HIGH);
  distance = (reading*0.034/2);
  Serial.println(distance);
  if(distance > 300)
{
  
  digitalWrite(23, HIGH);
  digitalWrite(22, LOW);
  digitalWrite(21, LOW);
}
else if( distance > 200)
{
  digitalWrite(22,HIGH);
  digitalWrite(23, LOW);
  digitalWrite(21, LOW);
}
  else
  {
  digitalWrite(21, HIGH);
  digitalWrite(22, LOW);
  digitalWrite(23, LOW);
  }
  // put your main code here, to run repeatedly:
   // this speeds up the simulation
}