Arduino Chapter 8

/**
* Exercise for Chapter 8
* When a button is pressed, it plays 4 tones
* The Potentiometer can be used to control the duration that each note is played.
* Author: James Wilkinson
**/

int speakerPin = 9;

int sensorPin = 0;    // select the input pin for the potentiometer
int sensorValue = 0;  // variable to store the value coming from the sensor


// Button pins
int inputPin1 = 2; // button 1
int inputPin2 = 3; // button 2

void playTone(int tone, int duration)
{
  for (long i = 0; i < duration * 1000L; i += tone * 2)
  {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}

void playNote(char note, int duration) {
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };

  // play the tone corresponding to the note name
  for (int i = 0; i < 8; i++) {
    if (names[i] == note) {
      playTone(tones[i], duration);
    }
  }
}

void setup() {
  pinMode(speakerPin, OUTPUT);
  pinMode(inputPin1, INPUT); // make button 1 an input
  pinMode(inputPin2, INPUT); // make button 2 an input

}

void loop()
{

  // read the value from the Potentiometer sensor:
  sensorValue = analogRead(sensorPin);

  if (digitalRead(inputPin1) == LOW && digitalRead(inputPin1) == LOW)
  {
    playNote('c', sensorValue);
  }
  else if(digitalRead(inputPin1) == HIGH && digitalRead(inputPin2) == LOW)
  {
    playNote('g', sensorValue);
  }
  else if (digitalRead(inputPin1) == HIGH && digitalRead(inputPin2) == HIGH)
  {
    playNote('e', sensorValue);
  }
  else
  {
    playNote('b', sensorValue);
  }
}