Lab 5 - Potentiometers
ASSIGNMENT
Connect a Piezo Speaker and a Potentiometer and create and Arduino program to use the Pot value to affect the tone / rhythm of sound emitted by the Piezo speaker.
MATERIALS USED
1 Piezo Speaker, 2 Potentometers
ARDUINO CODE
/*
* One pot changes the tone emitted by the Piezo speaker
* One pot changes the rhythm (on/off rate) of the tone.
* October 4, 2011
*/
int potPin_tone = 5; // set the input pin for the potentiometer for frequency
int val_tone = 0; // variable to store the value coming from the frequency pot
int potPin_delay = 2; // set the input pin for the potentiometer for rhythm
int val_delay = 0; // variable to store the value coming from the rhythm pot
int speakerPin = 6; // set the speaker pin
void setup() {
pinMode(speakerPin, OUTPUT);
}
void loop() {
val_tone = analogRead(potPin_tone); // read value from the frequency pot, between 0 - 1024
val_tone = val_tone + 950; // add 950 to pot value to bring it into the tone range
if (949 < val_tone < 1000){
val_tone = 956;
}
else if (999 < val_tone < 1060){
val_tone = 1014;
}
else if (1059 < val_tone < 1136){
val_tone = 1136;
}
else if (1135 < val_tone < 1275){
val_tone = 1275;
}
else if (1274 < val_tone < 1432){
val_tone = 1432;
}
else if (1431 < val_tone < 1519){
val_tone = 1519;
}
else if (1518 < val_tone < 1700){
val_tone = 1700;
}
else if (1699 < val_tone < 1975){
val_tone = 1915;
}
else {
val_tone = 956;
}
val_delay = analogRead(potPin_delay); // read the value from the delay pot, between 0 - 1024
val_delay = val_delay / 2; //bring the delay value down to the range of 0 - 512
// Set the speaker on for the val_delay number of cycles for the tone specified by the frequency pot
while(val_delay > 0) {
for( int i = 0; i < 20; i++ ) {
digitalWrite(speakerPin, HIGH);
delayMicroseconds(val_tone);
}
delay(val_delay); // wait for the delay amount
for( int i = 0; i < 20; i++ ) { // play it for rhythm pot value number of cycles
digitalWrite(speakerPin, LOW);
delayMicroseconds(val_tone);
}
}
}
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