#define trig 6
#define echo 5

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

void loop() {
  digitalWrite(trig,LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(20);
  digitalWrite(trig, LOW);
  int distance = pulseIn(echo, HIGH,26000);
  distance = distance /58 *10;
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println("mm");
  delay(50);

}