Lab5 - IO Play

Description

For this lab I sought out to combine the photocell with the piezo speaker to create a device that will change the pitch of a preset tune using the amount of light captured by the photocell.

Materials

• Arduino Uno
• Photocell Resistor
• Piezo Speaker
• 220 Ohm Resistor
• 10K Ohm Resistor
• Many Wires

Code

 

// Output

int redPin   = 10;

int greenPin = 11;

int bluePin  = 9;

 

// Input

int sensorPin = A0;

int sensorValue = 0;

 

int fsrPin = A4; // Force Sensitive Resistor

int fsrVal = 0;

 

int photoPin = A0;

int photoVal = 0;

 

int r = 255;

int g = 1;

int b = 1;

 

int speakerPin = 7;

byte names[] ={ 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};  

int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};

 

int i = 0;     // Loop counter

int runningSum = 0;

int pitchChange = 0;

 

int wait = 10; // 50ms (.05 second) delay; shorten for faster  fades

int DEBUG = 0; // DEBUG counter; if set to 1, will write values back via serial

 

int myMax = 30; // observed 'maximum' value

 

void setup()

{

  pinMode(redPin,   OUTPUT); // these are actually output

  pinMode(greenPin, OUTPUT);

  pinMode(bluePin,  OUTPUT);

  pinMode(speakerPin,  OUTPUT);

  if (DEBUG) {

  }

  Serial.begin(9600);

}

 

// Main program

void loop()

{

  // int switchValue = digitalRead(13);

  // Serial.println(switchValue);

  

  int photoVal = analogRead(photoPin);

  

  int r = 1;

  int g = 1;

  int b = 1;

  float fraction = 1;

  if (photoVal < 255) {

    fraction = float(photoVal) / 255;

    g = fraction * 255;

    if (g >= 255) { g = 255; }

    r = 255 - g;

    if (r <= 0) { r = 1; }

    b = 1;

    pitchChange = -100;

  }

  else if (photoVal < 509) {

    fraction = float(photoVal % 255)/255;

    b = fraction * 255;

    if (b >= 255) { b = 255; }

    g = 255 - b;

    if (g <= 0) { g = 1; }

    r = 1;

    pitchChange = 0;

  }

  else if (photoVal < 763) {

    fraction = float(photoVal % 255)/255;

    r = fraction * 255;

    if (r >= 255) { r = 255; }

    b = 255 - r;

    if (b <= 0) { b = 1; }

    g = 1;

    pitchChange = 100;

  }

  else {

    r = 255;

    b = 1;

    g = 1;

  }

  

  analogWrite(redPin, r);

  analogWrite(greenPin, g);

  analogWrite(bluePin, b);

  

  int speakerOut = 7;               

  byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};  

  int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};

  byte melody[] = "1a2d1a2d2g8p";

  int count = 0;

  int count2 = 0;

  int count3 = 0;

  int MAX_COUNT = 24;

  int statePin = LOW;

  digitalWrite(speakerOut, LOW);     

  for (count = 0; count < MAX_COUNT; count++) {

    statePin = !statePin;

    for (count3 = 0; count3 <= (melody[count*2] - 48) * 30; count3++) {

      for (count2=0;count2<8;count2++) {

        if (names[count2] == melody[count*2 + 1]) {       

          digitalWrite(speakerOut,HIGH);

          delayMicroseconds(tones[count2]+pitchChange);

          digitalWrite(speakerOut, LOW);

          delayMicroseconds(tones[count2]+pitchChange);

        } 

        if (melody[count*2 + 1] == 'p') {

          // make a pause of a certain size

          digitalWrite(speakerOut, 0);

          delayMicroseconds(500);

        }

      }

    }

  }

  

  delay(20);

}