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/*
* Arduino Jingle Bells. Reconstructed from code snippets here:
* http://www.uchobby.com/index.php/2007/11/22/arduino-sound-part-3-playing-a-melody/
*/
#define LEDPIN 13
#define OUTPIN 9
#define FREQ_A3 220.00
#define FREQ_AS3 233.08
#define FREQ_BF3 233.08
#define FREQ_B3 246.94
#define FREQ_C4 261.63 //Middle C
#define FREQ_CS4 277.18
#define FREQ_DF4 277.18
#define FREQ_D4 293.66
#define FREQ_DS4 311.13
#define FREQ_E4 329.63
#define FREQ_F4 349.23
#define FREQ_G4 392.00
#define FREQ_A4 440.00
#define FREQ_B4 493.88
#define FREQ_C5 523.25
#define FREQ_D5 587.33
#define WHOLE_NOTE_TIME 2000
void Sound(float freq, int durationMS, int outputPin) {
int halfPeriod;
float period;
int durationCycles;
//Check for rest, 0 frequency is a rest for durationMS.
if(freq==0.0) {
//0 frequency so we stay quiet for duration
delay (durationMS);
}
else { //Frequency is not zero so we have work to do
// turn on output pin
pinMode(outputPin, OUTPUT);
//calculate the period or cycle time for the given frequency
period=1/freq; //Take the reciprocal to get time in seconds
period=period*1.0E6; //to covert seconds to uS.
//divide that by 2 to get the 1/2 cycle time. convert to int at the same time
halfPeriod = (int)(period/2.0) - 7; // subtract 7 us to make up for digitalWrite overhead
// calculate cycles for duration.
durationCycles = (int)(((float)durationMS*1000.0)/period); // play note for duration ms
for (int i=0; i<durationCycles; i++){
digitalWrite(outputPin, HIGH);
delayMicroseconds(halfPeriod);
digitalWrite(outputPin, LOW);
delayMicroseconds(halfPeriod - 1); // - 1 to make up for fractional microsecond in digitaWrite overhead
}
// shut off pin to avoid noise from other operations
pinMode(outputPin, INPUT);
}
}
void PlayMusicString(char* music, int outputPin){
int noteCount=strlen(music);
float freq;
int duration;
for (int i=0;i<noteCount;i+=2) {
switch(music[i]){
case ' ' :
freq=0;
break;
case 'D' :
freq=FREQ_D4;
break;
case 'e' :
freq=FREQ_E4;
break;
case 'f' :
freq=FREQ_F4;
break;
case 'g' :
freq=FREQ_G4;
break;
case 'a' :
freq=FREQ_A4;
break;
case 'b' :
freq=FREQ_B4;
break;
case 'c' :
freq=FREQ_C5;
break;
case 'd' :
freq=FREQ_D5;
break;
}
//Note Timing
switch(music[i+1]){
case '1' :
duration=WHOLE_NOTE_TIME;
break;
case '2' :
duration=WHOLE_NOTE_TIME/2;
break;
case '4' :
duration=WHOLE_NOTE_TIME/4;
break;
case '8' :
duration=WHOLE_NOTE_TIME/8;
break;
}
Sound(freq,duration,outputPin);
delay(WHOLE_NOTE_TIME/32);
}
}
void setup() {
}
void loop() {
//Jingle Bells translated from sheet music at
char music[] = {
"D1e1f1g1a1b1c1d1"
"D4" "D4b4a4g4" "D2 4D4" "D4b4a4g4"
"e2 4e4" "e4c4b4a4" "f2 4d4" "d4d4c4a4"
"b2g4D4" "D4b4a4g4" "D2 4D4" "D4b4a4g4"
"e2 4e4" "e4c4b4a4" "d4d4d4d4" "e4d4c4a4"
"g2g4 4" "b4b4b2" "b4b4b2" "b4d4g4a8" "b2"
"c4c4c4c8" "c4b4b4b8b8" "b4a4a4b4" "a2d2"
"b4b4b2" "b4b4b2" "b4d4g4a8" "b2 4" "c4c4"
"c4b4b4b8b8" "d4d4c4a4" "g2"};
delay(1000);
PlayMusicString(music,OUTPIN);
}
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