int trig = 14;
int echo = 12;
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)+1;
  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);
 }
}