int trigger_pin = 25;
int echo_pin = 26;
float d;

void setup() {
  Serial.begin(115200);
  pinMode(trigger_pin, OUTPUT);
  pinMode(echo_pin, INPUT);
}

int wdistance() {
  digitalWrite(trigger_pin, LOW);
  delay(10);
  digitalWrite(trigger_pin, HIGH);
  delay(10); 
  digitalWrite(trigger_pin, LOW);
  d = pulseIn(echo_pin, HIGH);
  return (d * 0.034 / 2) + 1;
}

void loop() {
  String value = String(wdistance());
  delay(10);
  Serial.println(value);
}