Lab 5 - Input/Output Coincidence a.k.a. Musical Owl
Description
Use the inputs and output devices in lab thus far to create a project with input/output coincidence.
In this lab, I stuffed a red owl coin purse with tissue paper, a Piezo buzzer, and a force sensitive resistor to mimic a small stuffed toy that plays the tune "Twinkle, twinkle little star" when you squeeze it.
Components Used
- Arduino board x 1
- wires x several
- Force Sensitive Resistor (FSR) x 1
- 220 Ohm resistor x 1
- Piezo buzzer x 1
- Red owl coin purse x 1
- whimsical melody x 1
Arduino Code
/*
Squeeze_me
A Piezo buzzer inside an owl purse plays a melody
when you squeeze an FSR in the coin purse.
*/
int fsrPin = 1;
int fsrVal = 0;
int speakerPin = 7;
int count = 0;
byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};
int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
int hold[] = {100, 112, 126, 134, 150, 169, 189, 200};
int note = 0;
int lastNote = 15;
byte melody[] = "ccggaagppffeeddc";
int count3 = 0;
void setup() {
//initialize the Piezo sensor as output
pinMode(speakerPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite(speakerPin, LOW);
fsrVal = analogRead(fsrPin);
if (fsrVal > 10) {
Serial.println(fsrVal);
//for each note in the melody
for (note = 0; note <= lastNote; note++) {
//look for the note in the Piezo scale c - C
for (count = 0; count <= 8; count++) {
//if the note is found, play it for a number of cycles
//so that each note seems to be the same length (100 * (1915/tone))
if (melody[note] == names[count]) {
for (int i = 0; i < hold[count]; i++) {
digitalWrite(speakerPin, HIGH);
delayMicroseconds(tones[count]);
digitalWrite(speakerPin, LOW);
delayMicroseconds(tones[count]);
}
}
else if (melody[note] == 'p') {
//make a pause of a certain size
digitalWrite(speakerPin, LOW);
delay(20);
}
}
}
}
else {
Serial.println("no squeeze");
}
}
Video
Creator Comments
I updated the code (and video) to play each note for equal lengths of time.
