#define ECHO_PIN 12
#define TRIG_PIN 13
void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  for (int led = 2; led < 12; led++) {
    pinMode(led, OUTPUT);
  }
  Serial.begin(9600);
}
void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  int y = (-2E-06*distance*distance) + (1.0068*distance) - 0.036;
  Serial.print("Jarak: ");
  Serial.println(y);
  delay(100);
  int ledLevel = map(y, 2, 399, 1, 12);
  Serial.println(ledLevel);
  for (int led = 1; led < 12;led++) {
    if (led < ledLevel) {
      digitalWrite(led, HIGH);
    }
    else if(led > ledLevel){
      digitalWrite(led, LOW);
    }
  }
}