Simple Hand controlled instrument

1#define echoPin 6 
2#define trigPin 5 
3long duration; // variable  for the duration of sound wave travel
4int distance; // variable for the distance  measurement
5int tones;  
6int tim=200;// duration for which one sound pulse  will last
7int buzzerPin = 8;
8int space =500;
9
10void setup() {
11  pinMode(trigPin,  OUTPUT); // Sets the trigPin as an OUTPUT
12  pinMode(echoPin, INPUT); // Sets  the echoPin as an INPUT
13  pinMode(buzzerPin, OUTPUT);
14  }
15  
16void loop()  {
17  
18  //Finding distance of obstacle using ultrasonic sensor
19  digitalWrite(trigPin,  LOW);
20  delayMicroseconds(2);
21  digitalWrite(trigPin, HIGH);
22  delayMicroseconds(10);
23  digitalWrite(trigPin, LOW);
24  
25  duration = pulseIn(echoPin, HIGH); // Reads  the echoPin, returns the sound wave travel time in microseconds
26  distance =  duration * 0.034 / 2; // Distance = time*speed/2
27  
28  //Emitting sound as  per the distance
29  
30  tones =20+distance*5; //calculating the frequency that  has to be emitted
31
32   tone(buzzerPin, tones, tim); //emits sound at the specified  frequency and for the specified duration
33    
34   delay (space); //delay between  each beat
35  
36}
37