int va_pin = 27;
int po_pin = 26;

void setup()
{
  Serial.begin(115200);
  pinMode(va_pin, OUTPUT);
  pinMode(po_pin, INPUT);

}
int flying()
{
  digitalWrite(va_pin, LOW);
  delay(10);
  digitalWrite(va_pin, HIGH);
  Serial.println("hmm");
  delay(100);
  digitalWrite(va_pin, LOW);

  float rs = pulseIn(po_pin,HIGH);
  return(rs*0.034/2)+1;
  delay(1000);
  }
void loop()
{

  int c = flying();

  Serial.println(String(c));
  delay(1000);
}