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Buzzer example function for the CEM-1203 buzzer (Sparkfun's part #COM-07950).
// Buzzer example function for the CEM-1203 buzzer (Sparkfun's part #COM-07950).
// by Rob Faludi
// http://www.faludi.com
// Additions by Christopher Stevens
// http://www.christopherstevens.cc
//referenced from http://www.phy.mtu.edu/~suits/notefreqs.html
//starting with F noteFreqArr[1]
int noteFreqArr[] = {
49.4, 52.3, 55.4, 58.7, 62.2, 65.9, 69.9, 74, 78.4, 83.1, 88, 93.2,
98.8, 105, 111, 117, 124, 132, 140, 148, 157, 166, 176, 186,
198, 209, 222, 235, 249, 264, 279, 296, 314, 332, 352, 373,
395, 419, 444, 470, 498, 527, 559, 592, 627, 665, 704, 746,
790, 837, 887, 940, 996, 1050, 1110, 1180, 1250, 1320, 1400, 1490,
1580, 1670, 1770, 1870, 1990, 2100};
long mode = 0;
void setup() {
pinMode(4, OUTPUT); // set a pin for buzzer output
}
void playNote(long noteInt, long length, long mode, long breath = 25) {
length = length - breath;
long noteInt2 = noteInt + 12; //1 octave up
long noteInt3 = noteInt + 24; //2 octaves up
long noteInt4 = noteInt + 36; //3 octaves up
long playLoop = length / 100; //divide length by 4, for use in play sequence
if(mode == 0) { //mode 0 sequence
for (long i=0; i < playLoop; i++){
buzz(4, noteFreqArr[noteInt], 20);
delay(5);
buzz(4, noteFreqArr[noteInt2], 20);
delay(5);
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt4], 20);
delay(5);
}
} else if(mode == 1) { //mode 1 sequence
for (long i=0; i < playLoop; i++){
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt4], 20);
delay(5);
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt4], 20);
delay(5);
}
} else if(mode == 2) { //mode 2 sequence
for (long i=0; i < playLoop; i++){
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt3], 20);
delay(5);
buzz(4, noteFreqArr[noteInt2], 20);
delay(5);
}
} else if(mode == 3) { //mode 3 sequence
for (long i=0; i < playLoop; i++){
buzz(4, noteFreqArr[noteInt4], 40);
delay(5);
buzz(4, noteFreqArr[noteInt2], 40);
delay(5);
}
}
if(breath > 0) { //take a short pause or 'breath' if specified
delay(breath);
}
}
void loop() {
//main course
playNote(12, 500, mode);
playNote(5, 1000, mode);
playNote(7, 250, mode);
playNote(10, 250, mode);
playNote(9, 250, mode);
playNote(7, 250, mode);
playNote(12, 500, mode);
playNote(12, 500, mode);
playNote(12, 250, mode);
playNote(14, 250, mode);
playNote(9, 250, mode);
playNote(10, 250, mode);
playNote(7, 500, mode);
playNote(7, 500, mode);
playNote(7, 250, mode);
playNote(10, 250, mode);
playNote(9, 250, mode);
playNote(7, 250, mode);
playNote(5, 250, mode);
playNote(17, 250, mode);
playNote(16, 250, mode);
playNote(14, 250, mode);
playNote(12, 250, mode);
playNote(10, 250, mode);
playNote(9, 250, mode);
playNote(7, 250, mode);
playNote(5, 1000, mode);
playNote(7, 250, mode);
playNote(10, 250, mode);
playNote(9, 250, mode);
playNote(7, 250, mode);
playNote(12, 500, mode);
playNote(12, 500, mode);
playNote(12, 250, mode);
playNote(14, 250, mode);
playNote(9, 250, mode);
playNote(10, 250, mode);
playNote(7, 500, mode);
playNote(7, 500, mode);
playNote(7, 250, mode);
playNote(10, 250, mode);
playNote(9, 250, mode);
playNote(7, 250, mode);
playNote(5, 250, mode);
playNote(12, 250, mode);
playNote(7, 250, mode);
playNote(9, 250, mode);
playNote(5, 250, mode);
delay(250);
if(mode == 0) {
mode = 1;
} else if(mode == 1) {
mode = 2;
} else if(mode == 2) {
mode = 3;
} else if(mode == 3) {
mode = 0;
}
}
void buzz(int targetPin, long frequency, long length) {
long delayValue = 1000000/frequency/2; // calculate the delay value between transitions
//// 1 second's worth of microseconds, divided by the frequency, then split in half since
//// there are two phases to each cycle
long numCycles = frequency * length/ 1000; // calculate the number of cycles for proper timing
//// multiply frequency, which is really cycles per second, by the number of seconds to
//// get the total number of cycles to produce
for (long i=0; i < numCycles; i++){ // for the calculated length of time...
digitalWrite(targetPin,HIGH); // write the buzzer pin high to push out the diaphram
delayMicroseconds(delayValue); // wait for the calculated delay value
digitalWrite(targetPin,LOW); // write the buzzer pin low to pull back the diaphram
delayMicroseconds(delayValue); // wait againf or the calculated delay value
}
}
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