Laser harp-like sound making instrument prototype

1// Laser Harp Project V1.0 
2// Olivier E
3// 12/04/2021
4
5int  maxBrightness = 0;    //calibration of max detected brightness
6
7void setup()  {
8  //Serial.begin(9600);   //uncomment to show analog input values on serial  m.
9  pinMode(9,OUTPUT);      //speaker
10
11  //calibration during first 5000  ms
12  long startTime = millis(); 
13  while (millis()-startTime < 5000) {
14     int brightness = analogRead(A0);
15     if (brightness > maxBrightness) maxBrightness  = brightness;
16  }
17  //Serial.print("maxBrightness = "); //uncomment to show  analog input values
18  //Serial.println(maxBrightness); //uncomment to show analog  input values
19  tone(9,110,100);        //make a sound when calibration done
20  delay(100);
21  noTone(9);     
22}
23
24void loop() {
25  int brightness  = analogRead(A0);      //read phototransistor output voltage
26  if (brightness  < maxBrightness*0.1) { //if low brightness: asked to play!
27    //Serial.println(brightness);  //uncomment to show analog input values     
28    tone(9,random(50,600),random(100,2000));  //play random note
29    delay(250);
30    noTone(9);               
31  }
32  delay(10);
33}

1// Laser Harp Project V1.0 
2// Olivier E
3// 12/04/2021
4
5int
6  maxBrightness = 0;    //calibration of max detected brightness
7
8void setup()
9  {
10  //Serial.begin(9600);   //uncomment to show analog input values on serial
11  m.
12  pinMode(9,OUTPUT);      //speaker
13
14  //calibration during first 5000
15  ms
16  long startTime = millis(); 
17  while (millis()-startTime < 5000) {
18
19     int brightness = analogRead(A0);
20     if (brightness > maxBrightness) maxBrightness
21  = brightness;
22  }
23  //Serial.print("maxBrightness = "); //uncomment to show
24  analog input values
25  //Serial.println(maxBrightness); //uncomment to show analog
26  input values
27  tone(9,110,100);        //make a sound when calibration done
28
29  delay(100);
30  noTone(9);     
31}
32
33void loop() {
34  int brightness
35  = analogRead(A0);      //read phototransistor output voltage
36  if (brightness
37  < maxBrightness*0.1) { //if low brightness: asked to play!
38    //Serial.println(brightness);
39  //uncomment to show analog input values     
40    tone(9,random(50,600),random(100,2000));
41  //play random note
42    delay(250);
43    noTone(9);               
44  }
45
46  delay(10);
47}