//*****ULTRASONIK, menamai pin yang digunakan****************
#define pinecho 2
#define pintrig 15
#define LED 14
void setup() {
  //*****SERIAL MONITOR, setting baud rate*******************
  Serial.begin(115200);

  //*****ULTRASONIK, setting pin yang digunakan**************
  pinMode(pinecho, INPUT);
  pinMode(pintrig, OUTPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  //*****ULTRASONIK, membaca jarak***************************
  digitalWrite(pintrig, LOW);
  delayMicroseconds(2);
  digitalWrite(pintrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pintrig, LOW);
  int waktu=pulseIn(pinecho, HIGH);
  float jarak=waktu*0.034/2;
  //*****SERIAL MONITOR, menampilkan data jarak**************
  Serial.print("Jarak = ");
  Serial.print(jarak);
  Serial.println("cm");
  delay(1000);

  if(jarak<=100){
    digitalWrite(LED, HIGH);
  }
  else{
    digitalWrite(LED, LOW);
  }
}