#define trig 11
#define echo 10

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  Serial.begin(9600);
}

void check_distance () {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  long t = pulseIn(echo, HIGH);
  int distance = t * 0.01715 ;
  Serial.println("t=" + String(t) + "usec");
  Serial.println("d=" + String(distance) + "cm");
}

void loop() {
  check_distance();
  delay(100);
}