const int led[] = {2, 3, 4, 5, 6, 7};
// const int led[] = {7, 6, 5, 4, 3, 2};
const int dist[] ={10, 20, 30, 40, 50, 60};

int echo = 11;
int trig = 10;

void setup()
{
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  for(int i = 0; i < 6; i++)
  {
    pinMode(led[i], OUTPUT);
  }
}

void loop()
{
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  long duration, distance;
  duration = pulseIn(echo, HIGH);
  distance = duration/200;
  // distance = (duration/2)/29.1;
  for(int i = 0; i < 6; i++)
  {
    if(distance < dist[i])
    {
      digitalWrite(led[i], HIGH);
    }
    else
    {
      digitalWrite(led[i], LOW);
    }
  }
  delay(100);
}