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July 9, 2015 17:00
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/* Melody | |
* (cleft) 2005 D. Cuartielles for K3 | |
* | |
* This example uses a piezo speaker to play melodies. It sends | |
* a square wave of the appropriate frequency to the piezo, generating | |
* the corresponding tone. | |
* | |
* 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 speakerPin = 9; | |
int inPin = 0; | |
int length = 15; // the number of notes | |
char notes[] = "ccggaagffeeddc "; // a space represents a rest | |
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 }; | |
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(inPin, INPUT); | |
Serial.begin(9600); | |
} | |
void loop() { | |
int val = analogRead(inPin); | |
int realval=val/5; | |
char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' }; | |
Serial.println(val); | |
Serial.println(names[realval]); | |
playNote(names[realval],0.5); | |
// pause between notes | |
delay(tempo / 2); | |
} |
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