6. Learning the piezo "slide whistle" like a child learns recorder
"Slide Whistle"
Using an FSR, a light sensitive resistor, a piezo speaker and a homemade slide "whistle", I relearned how frustrating it is to get the right notes to come out when you want.
Video: http://www.youtube.com/watch?v=RNeqS4zIRB4
The code breaks each section of the "whistle" into notes, ranging from low c to C. You then press on the button when you want the note to come out. The Serial monitor outputs what note you're playing.
/* Erich Hacker
TUI Hw5 - Piezo Speaker
* note frequency period PW (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
*/
int buttonPin = 4;
int photoPin = 5;
int speakerPin = 11;
byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};
int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
int val = 0;
int button = 0;
int count = 1;
void setup() {
pinMode(speakerPin, OUTPUT);
pinMode(buttonPin, INPUT);
pinMode(photoPin, INPUT);
Serial.begin(9600);
}
void loop() {
button = analogRead(buttonPin);
//Serial.println(button);
while(button > 1015){
val = analogRead(photoPin);
if(val<600){count=0;
}else if(val<700){count=1;
}else if(val<750){count=2;
}else if(val<800){count=3;
}else if(val<850){count=4;
}else if(val<900){count=5;
}else if(val<950){count=6;
}else if(val>=950){count=7;
}
Serial.print(" Note=");
Serial.println(names[count]);
for( int i=0; i<75; i++ ) { // play it for 50 cycles
digitalWrite(speakerPin, LOW);
delayMicroseconds(tones[count]);
digitalWrite(speakerPin, HIGH);
delayMicroseconds(tones[count]);
}
button = analogRead(buttonPin);
}
digitalWrite(speakerPin, LOW);
}
