#define USS_TRIG 2
#define USS_ECHO 3

long duration;
int distCM, distINCH;

void setup() {
  Serial.begin(9600);
  //pinMode(ts, INPUT);
  pinMode(USS_TRIG, OUTPUT);
  pinMode(USS_ECHO, INPUT);
}

void loop() {
  makeOnePulse();
  duration = pulseIn(USS_ECHO,HIGH);
  distCM = duration * 0.034 / 2;
  distINCH = duration * 0.0113 / 2;
  Serial.print("CM : ");
  Serial.println(distCM);
  Serial.print("Inch : ");
  Serial.println(distINCH);
  Serial.println();
  delay(5000);
}

void makeOnePulse() {
  digitalWrite(USS_TRIG, LOW);
  delay(2);
  digitalWrite(USS_TRIG, HIGH);
  delay(10);
  digitalWrite(USS_TRIG, LOW);
}