HCI Lab 2, Group 12

int length = 15; // the number of notes
char notes[] = "ccggaagffeeddc "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };


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


int tempo = 300;
int speakerPin = 8;
int inputPin = 0;

const int groundpin = A2; // analog input pin 2
const int powerpin = A0; // analog input pin 0
const int xpin = A5; // x-axis of the accelerometer
const int ypin = A4; // y-axis
const int zpin = A3; // z-axis

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

/*
* getVoltage() – return the voltage on the analoge input defined by pin
*
*/
float getVoltage(int pin) {
return (analogRead(pin) * .004882813);
// reading a digital pin returns a value between 0 and 1024, which corresponds to a voltage range
// between 0V and 5V.
// So, one digital step means 5V/1024 = ~0.005V, or about 5 millivolt
}

void setup() {
  Serial.begin(9600);
  pinMode(speakerPin, OUTPUT);
 // Provide ground and power by using the analog inputs as normal
 // digital pins. This makes it possible to directly connect the
 // breakout board to the Arduino. If you use the normal 5V and
 // GND pins on the Arduino, you can remove these lines.
 pinMode(groundpin, OUTPUT);
 // pinMode(powerpin, OUTPUT);
 digitalWrite(groundpin, LOW);
 digitalWrite(powerpin, HIGH);
}

void playInput(int input) {
  int i;
  Serial.print("pot input: ");
  Serial.println(input);
  for (i = 0; i <= 1023; i++) {
    if (input < i*(1024/8)) {
      // playNote('c', 2500);
      playTone(tones[i-1], 250);
      break;
    }
  }
}

void loop() {
  int input = analogRead(inputPin);

  double xval = analogRead(xpin);
  double yval = analogRead(ypin);
  double zval = analogRead(zpin);

  double mag_squared = xval * xval + yval * yval + zval * zval;
  if (mag_squared > 450000) {
    Serial.println("found note");
    playInput(input);
    delay(150);
  }

  delay(10);
  // for (int i = 0; i < length; i++) {
  //   if (notes[i] == ' ') {
  //     delay(beats[i] * tempo); // rest
  //   } else {
  //     playNote(notes[i], beats[i] * tempo);
  //   }

  //   // pause between notes
  //   delay(tempo / 2);
  // }
}