Lab 5
Description
Uses photocell and FSR to control the tempo and melody of the sound generated from the speaker.
Material Used
1 photocell
2 10K resistors
Piezo speaker
Code
/* Melody
* (cleft) 2005 D. Cuartielles for K3
* modified from http://oomlout.com/a/products/ardx/circ-06/
*
* 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 tempo and the melody can be changed depending
* upon values from the FSR and the photocell
*
* 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 potPin = 0; // select the input pin for the photocell
int fsrPin=5; // select the input pin for the FSR
int val = 0;
int fsrval = 0;
int speakerPin = 7;
int length = 15; // the number of notes
char notes1[] = "ccggaagffeeddc"; // a space represents a rest
char notes2[] ="gagegageddbccga";
//acbagageddfdbcecgegfdc";
int notePlaying=2;
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);
Serial.begin(9600);
Serial.println("ready");
}
void loop() {
val = analogRead(potPin); // read value from the sensor
val = val*2;
tempo=val;
fsrval=analogRead(fsrPin);
Serial.println(fsrval);
if(fsrval>=100 && notePlaying==2)
{
notePlaying=1;
}
if(fsrval>=100 && notePlaying==1)
{
notePlaying==2;
}
if(notePlaying==2)
{
for (int i = 0; i < length; i++) {
if (notes2[i] == ' ') {
delay(beats[i] * tempo); // rest
} else {
playNote(notes2[i], beats[i] * tempo);
}
// pause between notes
delay(tempo / 2);
}
}
if(notePlaying==2)
{
for (int i = 0; i < length; i++) {
if (notes1[i] == ' ') {
delay(beats[i] * tempo); // rest
} else {
playNote(notes1[i], beats[i] * tempo);
}
// pause between notes
delay(tempo / 2);
}
}
}
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