void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(14, INPUT);
  pinMode(26, OUTPUT);
  pinMode(4, OUTPUT);
}
long wdistance(){
 digitalWrite(26,LOW);
 digitalWrite(26,HIGH);
 delay(0.00000001);
 digitalWrite(26,LOW);
 float t=pulseIn(14,HIGH);
 return((t*0.034/2)+1);

 delay(1000);
 }
void loop() {
  // put your main code here, to run repeatedly:
  int c=wdistance();
  Serial.println(String(c));
  if(c>=200){
  digitalWrite(4, HIGH);
  }
  else{
  digitalWrite(4,LOW);
  }
  delay(1000); // this speeds up the simulation
}