/* Barnacle Budd's Binary Music Machine - v. 0.1
(c) 2011, Budd Churchward - WB7FHC
04-10-11
visit http://bit.ly/h7R5Qt for hook up instructions
*/
int button4=7; // declare top button on pin 7
int button3=6; // declare next button on pin 6
int button2=5; // declare next button on pin 5
int button1=4; // declare bottom button on pin 4
int speaker=11; // declare speaker output on pin 11
// These two arrays store the frequencies of our musical notes
// Only one set is used at a time.
int naturals[] = {0,131,147,165,175,196,220,247,262,294,330,349,392,440,494,523};
int pentatonic[] = {0,139,156,185,208,233,277,311,370,415,466,554,622,740,831,932};
void setup() {
// define 4 input and 1 output pins:
pinMode(button4,INPUT);
pinMode(button3,INPUT);
pinMode(button2,INPUT);
pinMode(button1,INPUT);
pinMode(speaker,OUTPUT);
}
void loop() {
delay(200); // Adjust this delay if you have trouble pressing and releasing multiple
// buttons at the same time.
buildNote(); // Go check our buttons and build us a note if any are down
}
void buildNote () {
int myNum = 0; // Start with zero
myNum = myNum + digitalRead(button4); // Add 1 if button 4 is down
myNum = myNum << 1; // Shift the bits to the left one place
myNum = myNum + digitalRead(button3); // Add 1 if button 3 is down
myNum = myNum << 1; // Shift once more
myNum = myNum + digitalRead(button2); // Add 1 if button 2 is down
myNum = myNum << 1; // Shift for the last time
myNum = myNum + digitalRead(button1); // Add 1 if button 1 is down
if (myNum==0) { // If no buttons were down, myNum is still zero
noTone(speaker); // There are no buttons down so shut off the tone
return; // Jump out of here early
}
// Rem out one of the following two lines to choose which scale to play
//tone(speaker, pentatonic[myNum]); // Pick out a frequency from our pentatonic array
// and play it indefinitely
tone(speaker, naturals[myNum]); // Pick out a frequency from our natural array and
// play it indefinitely
}
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