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Arduino 3 button piano code
/* Heavily based on http://ardx.org/src/circ/CIRC06-code.txt
* and also http://ardx.org/src/circ/CIRC07-code.txt
* Circuit information at http://www.oomlout.com/oom.php/products/ardx/circ-06
* and http://www.oomlout.com/oom.php/products/ardx/circ-07
* may also help
*
* The calculation of the tones is made following the mathematical
* operation:
*
* timeHigh = period / 2 = 1 / (2 * toneFrequency)
*
* where the different tones are described as in the table:
*
* note frequency period timeHigh
* c 261 Hz 3830 1915
* d 294 Hz 3400 1700
* e 329 Hz 3038 1519
* f 349 Hz 2864 1432
* g 392 Hz 2550 1275
* a 440 Hz 2272 1136
* b 493 Hz 2028 1014
* C 523 Hz 1912 956
*
* http://www.arduino.cc/en/Tutorial/Melody
*/
int inputPin1 = 2;
int inputPin2 = 4;
int inputPin3 = 6;
int speakerPin = 7;
int val = 0;
int length = 1; // the number of notes
char notes[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' }; // a space represents a rest
int beats[] = { 1 };
int tempo = 300;
void playTone(int tone, int duration) {
for (long i = 0; i < duration * 1000L; i += tone * 2) {
digitalWrite(speakerPin, HIGH);
delayMicroseconds(tone);
digitalWrite(speakerPin, LOW);
delayMicroseconds(tone);
}
}
void playNote(char note, int duration) {
char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
// play the tone corresponding to the note name
for (int i = 0; i < 8; i++) {
if (names[i] == note) {
playTone(tones[i], duration);
}
}
}
void setup() {
pinMode(speakerPin, OUTPUT);
pinMode(inputPin1, INPUT);
pinMode(inputPin2, INPUT);
pinMode(inputPin3, INPUT);
}
void loop() {
if (digitalRead(inputPin1) == LOW) {
playNote(notes[0], 300);
} else if (digitalRead(inputPin2) == LOW) {
playNote(notes[1], 300);
} else if (digitalRead(inputPin3) == LOW) {
playNote(notes[2], 300);
} else {
digitalWrite(speakerPin, LOW);
}
}
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