arduino

int buzzerPin = 6; // Buzzer is connected to digital pin 6 int lightPin = 0; // sensor connected to analog pin 0

int lightValue; // a variable to keep track of light int iniLight; // a var to hold the initial light reading

int melody[] = {0, 0, 0, 0}; // an array to hold int melodyCount = 0;

void setup() {
pinMode(buzzerPin, OUTPUT); // sets the buzzerPin to be an output Serial.begin(9600); // open the serial port:

 pinMode(lightPin, INPUT);  // sets the sensorPin to be an input
 analogWrite(lightPin, LOW);  // sets the default (unpressed) state of switchPin to HIGH

 iniLight = analogRead(lightPin);

}

// runs on a loop
void loop() {

// read the value from the sensor
lightValue = analogRead(lightPin);  
Serial.println(lightValue);
 
// if someone types a character, add it to melody[]
if (Serial.available() > 0 ) { 
     int note = Serial.read();
     // if a letter a thru g is pressed, add it to the list of notes
     if (note >= 'a' && note <= 'g') {
         // Serial.print("char is a note: ");  
         // Serial.println(note); 
         melody[melodyCount] = note;
         melodyCount++;
      }
      // if an 'x' is pressed, reset the tune and start over
      else if (note == 'x') {
          clearMelody();
          melodyCount = 0;
          iniLight = analogRead(lightPin);
      }
 } 
 
 //determine the speed of the beat based on light sensor input by user
 int lightSpeed = 400*lightValue/iniLight;
 lightSpeed += 100; // add base speed to ensure beeps aren't running too fast
 playMelody(lightSpeed); 

 // Serial.print("LightSpeed: ");
 // Serial.println(lightSpeed);   

}

// for each letter input, play a certain note at speed s void playMelody(int s) {

for (int i=0; i<sizeof(melody); i++) {
     switch (melody[i]) {
        case 'a': 
          beep(buzzerPin,3520,s);
          break;
        case 'b':
          beep(buzzerPin,3951,s);
          break;
        case 'c':
          beep(buzzerPin,2093,s);
          break;
        case 'd':
          beep(buzzerPin,2349,s);
          break;
        case 'e':
          beep(buzzerPin,2637,s);
          break;
        case 'f':
          beep(buzzerPin,2793,s);
          break;
        case 'g':
          beep(buzzerPin,3136,s);
          break;            
        default:
          Serial.println("press a key, a thru g, to add a note to your beat. press x to start over.");

      }
  } 

}

// clear the Melody array of all notes, start over void clearMelody() { for(int i=0; i<sizeof(melody); i++) { melody[i] = (char)0; Serial.print(melody[i]); } }

// the sound producing function taken from tutorial at http://web.media.mit.edu/~leah/LilyPad/07_sound_code.html void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds) {
int x;
long delayAmount = (long)(1000000/frequencyInHertz); long loopTime = (long)((timeInMilliseconds1000)/(delayAmount2)); for (x=0;x<loopTime;x++)
{
digitalWrite(speakerPin,HIGH); delayMicroseconds(delayAmount); digitalWrite(speakerPin,LOW); delayMicroseconds(delayAmount); }
}