Gonna Get Ya
Video: http://www.youtube.com/watch?v=N64cGSj56rs
Description:
I wanted to create something using the photocell. I finally decided on creating a backpack that when opened plays ominous music. And there is no music more ominous that the Jaws theme. As you open your backpack and more light comes into the backpack the music plays faster (and more ominously). The music has three speeds that are determined by how much light the photocell receives. When the photocell doesn't receive any light the music stops.
Materials
- Arduino Uno Board
- 10k Resistors
- Wires/Board
- Photocell
- Backpack
Arduino code:
/* Play Melody
* -----------
*
* Program to play melodies stored in an array, it requires to know
* about timing issues and about how to play tones.
*
* The calculation of the tones is made following the mathematical
* operation:
*
* timeHigh = 1/(2 * toneFrequency) = period / 2
*
* where the different tones are described as in the table:
*
* 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
*
* (cleft) 2005 D. Cuartielles for K3
*/
int sensorPin = 3; // select the input pin for the photosensor
int speakerOut = 7;
int sensorVal = 0;
int val = 0;
byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};
int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
byte melody1[] = "10e10f10e10f";
byte melody2[] = "8e8f8e8f";
byte melody3[] = "6e6f6e6f";
byte melody4[] = "2e2f2e2f";
// count length: 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
// 10 20 30
int count = 0;
int count2 = 0;
int count3 = 0;
int MAX_COUNT = 48; //the longest song is 32 counts so this is also 32
int statePin = LOW;
void setup() {
Serial.begin(9600);
pinMode(speakerOut, OUTPUT);
}
void loop() {
val = analogRead(sensorPin); // read the value from the sensor, between 0 - 1024
Serial.println(val);
sensorVal = analogRead(sensorPin); // read the value of the sensor
if (sensorVal > 0 && sensorVal < 150){ // if light is hitting the sensor then play.
for (count = 0; count < MAX_COUNT; count++) { // this increments by one so it will stop
for (count3 = 0; count3 <= (melody2[count*2] - 48) * 30; count3++) {
for (count2=0;count2<8;count2++) {
if (names[count2] == melody2[count*2 + 1]) {
digitalWrite(speakerOut,HIGH);
delayMicroseconds(tones[count2]);
digitalWrite(speakerOut, LOW);
delayMicroseconds(tones[count2]);
}
}
}
}
}
else if (sensorVal > 150 && sensorVal< 200){ // if more light gets faster
for (count = 0; count < MAX_COUNT; count++) { // this increments by one so it will stop
for (count3 = 0; count3 <= (melody3[count*2] - 48) * 30; count3++) {
for (count2=0;count2<8;count2++) {
if (names[count2] == melody3[count*2 + 1]) {
digitalWrite(speakerOut,HIGH);
delayMicroseconds(tones[count2]);
digitalWrite(speakerOut, LOW);
delayMicroseconds(tones[count2]);
}
}
}
}
}
else if (sensorVal > 200){ // if more light gets faster
for (count = 0; count < MAX_COUNT; count++) { // this increments by one so it will stop
for (count3 = 0; count3 <= (melody4[count*2] - 48) * 30; count3++) {
for (count2=0;count2<8;count2++) {
if (names[count2] == melody4[count*2 + 1]) {
digitalWrite(speakerOut,HIGH);
delayMicroseconds(tones[count2]);
digitalWrite(speakerOut, LOW);
delayMicroseconds(tones[count2]);
}
}
}
}
}
else if (sensorVal == 0){ // need this to turn off loop
digitalWrite(speakerOut, 0);
return;
}
}
