#define echo 8 
#define trig 9
int n ;
void setup() {
  pinMode(8, INPUT);
  pinMode(9, OUTPUT);
  Serial.begin(9600);
  for (int x=2 ;x<=13 ; x++){
    if (x==8){  
      continue;
    }
    pinMode(x, OUTPUT);
  }

}

void loop() {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  int t=pulseIn(echo,HIGH);
  int distance=(t/2) * 0.0343 ;
  Serial.println(distance); 
  n=map(distance,0,400,2,13);
  for (int x=2 ;x<=n ; x++){
    if (x==8){  
      continue;
    }
    digitalWrite(x, HIGH);
    delay(5);
    digitalWrite(x, LOW);
  }
  delay(30);
}