#define ECHO_PIN 12
#define TRIG_PIN 13
long duration, jarak;

void setup() {
  Serial.begin (9600);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  Serial.println("Penggaris digital");
} 
void loop() {
  digitalWrite(TRIG_PIN,HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  jarak = 0.0175 * duration;
  
  Serial.print("jarak=");
  Serial.print(jarak);
  Serial.println("cm");
  delay(100);




}