Programming

For each photoresistor I tested the reading when the graphics block the light. Then I define the triggering event. When the reading decrease to a certain value, the speaker will output a note related to the photoresistor. In my final prototype 6 photoresistors are assigned 6 different notes.

Below is my main code:

#include "pitches.h"

const int pResistor1 = A1;
const int pResistor2 = A2;
const int pResistor3 = A3;
const int pResistor4 = A4;
const int pResistor5 = A5; 
const int pResistor6 = A0; 

const int pot1 = A6;
const int pot2 = A7;
const int button1 = 5;
const int button2 = 6;

const int motorin1 = 2;
const int motorin2 = 3;
const int enable = 9;

int potvalue1;
int potvalue2;
int pwm1;
int pwm2;

int notes[] = {
  NOTE_E4, NOTE_G4, NOTE_B5, NOTE_D5,NOTE_G5,  NOTE_B6, NOTE_C6};


int value1; 
int value2; 
int value3; 
int value4;         
int value5;  
int value6;  

void setup(){
 Serial.begin(9600);
 
 pinMode(button1, INPUT);
 pinMode(button2, INPUT);
 pinMode(pot1, INPUT);
 pinMode(pot2, INPUT);
 pinMode(motorin1, OUTPUT);
 pinMode(motorin2, OUTPUT);
 pinMode(enable, OUTPUT);

 digitalWrite(enable, LOW);
}

void loop(){

  potvalue1 = analogRead(pot1);
  pwm1 = map(potvalue1, 0, 1023, 255, 0);
  potvalue2 = analogRead(pot2);
  pwm2 = map(potvalue2, 0, 1023, 255, 0);
  Serial.print(pwm1);
  Serial.print(" ");
  Serial.print(pwm2);
  delay(10);

  analogWrite(motorin2,pwm1);
   
  if(digitalRead(button1) == LOW){
    digitalWrite(enable, HIGH);
    digitalWrite(motorin1, LOW);
    digitalWrite(motorin2, HIGH);  
  }
  
  if(digitalRead(button2) == LOW){
    digitalWrite(enable, HIGH);
    digitalWrite(motorin1, HIGH);
    digitalWrite(motorin2, LOW);
  }

  value1 = analogRead(pResistor1);
  delay(10);
  value2 = analogRead(pResistor2);
  delay(10);
  value3 = analogRead(pResistor3);
  delay(10);
  value4 = analogRead(pResistor4);
  delay(10);
  value5 = analogRead(pResistor5);
  delay(10);
  value6 = analogRead(pResistor6);
  delay(10);

  Serial.print(" ");
  Serial.print(value1);
  Serial.print(" ");
  Serial.print(value2);
  Serial.print(" ");
  Serial.print(value3);
  Serial.print(" ");
  Serial.print(value4);
  Serial.print(" ");
  Serial.print(value5);
  Serial.print(" ");
  Serial.println(value6);

  
  if (value1 < 970){
    tone(8, notes[0], 20);  
  }

  if (value2 <970){
    tone(8, notes[1], 20);
  }

  if (value3 < 970){
    tone(8, notes[2], 20);
  }

  if (value4 < 970){
    tone(8, notes[3], 20);
  }
  if (value5 < 970){
    tone(8, notes[4], 20);
  }
if (value6 < 970){
    tone(8, notes[5], 20);
  }

}

And here is the seperate code defining pitches:

/*************************************************
 * Public Constants
 *************************************************/

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978