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);
}
}
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