hcsr04

const int trig = 11;
const int echo = 10;
const int DC = 9;
int led = 13;
int jarak = 0;
long durasi=0;

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

void loop() {
digitalWrite(trig, LOW);
 delayMicroseconds(2);
 digitalWrite(trig, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echo, HIGH);
 jarak = (duration/2) / 29.1;
 Serial.println(jarak); //menampilkan nilai jarak dalam centimeter
if  (jarak >= 10) {
  int val = map(jarak, 10, 300, 70, 255); //membuat skala nilai jarak menjadi nilai PWM
  analogWrite(DC, val); //memberikan nilai PWM berdasarkan nilai val
  digitalWrite(led, HIGH);
      delay(val); //buat delay berdasarkan nillai val
      digitalWrite (led, LOW);
      }
else{ //jika jarak kurang dari 10 cm, maka motor akan berhenti.
  digitalWrite(led, LOW);
  digitalWrite(DC, LOW);         }}