int sound = 250;
int trigPin = 11;
int echoPin = 12;
long duration, cm, inches;
int a = 0;
int b = 1;
int c = 2;
int d = 3;
int e = 4;
int f = 5;
int g = 6;
int h = 7;
int i = 8;
int j = 9;
int buzzer = 10;
void setup() {
   Serial.begin (9600);
   pinMode(trigPin, OUTPUT);
   pinMode(echoPin, INPUT);
   pinMode(a, OUTPUT);
   pinMode(b, OUTPUT);
   pinMode(c, OUTPUT);
   pinMode(d, OUTPUT);
   pinMode(e, OUTPUT);
   pinMode(f, OUTPUT);
   pinMode(g, OUTPUT);
   pinMode(h, OUTPUT);
   pinMode(i, OUTPUT);
   pinMode(j, OUTPUT);
   pinMode(buzzer, OUTPUT);
}
void loop() {
     long duration, distance;
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
    if (distance <= 10) {
    digitalWrite(a, HIGH);
    sound = 250;
}
  else {
    digitalWrite(a,LOW);
  }
  if (distance > 20) {
      digitalWrite(b, HIGH);
      sound = 260;
}
  else {
      digitalWrite(b, LOW);
  }
  if (distance > 30) {
      digitalWrite(c, HIGH);
      sound = 270;
} 
  else {
    digitalWrite(c, LOW);
  }
  if (distance > 40) {
    digitalWrite(d, HIGH);
    sound = 280;
}
  else {
    digitalWrite(d,LOW);
  }
  if (distance > 50) {
    digitalWrite(e, HIGH);
    sound = 290;
}
  else {
    digitalWrite(e,LOW);
  }
  if (distance > 60) {
    digitalWrite(f, HIGH);
    sound = 300;
}
  else {
    digitalWrite(f,LOW);
  }
  if (distance > 70) {
    digitalWrite(g, HIGH);
    sound = 300;
}
  else {
    digitalWrite(g,LOW);
  }
  if (distance > 80) {
    digitalWrite(h, HIGH);
    sound = 300;
}
  else {
    digitalWrite(h,LOW);
  }
  if (distance > 90) {
    digitalWrite(i, HIGH);
    sound = 300;
}
  else {
    digitalWrite(i,LOW);
  }
  if (distance > 100) {
    digitalWrite(j, HIGH);
    sound = 300;
}
  else {
    digitalWrite(j,LOW);
  }
 
  if (distance > 101 || distance <= 0){
    Serial.println("Out of range");
    noTone(buzzer);
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
    tone(buzzer, sound);
   
  }
  delay(500);
}