Day18

#include <TimerOne.h>
const int BUTTON_INT = 0;
const int SPEAKER = 12;
#define NOTE_C 65 
#define NOTE_D 73
#define NOTE_E 82
#define NOTE_F 87
#define NOTE_G 98
#define NOTE_A 110
#define NOTE_B 123

volatile int key = NOTE_C;
volatile int octave_multiplier = 1;
void setup()
{
  Serial.begin(9600);
  pinMode(SPEAKER,OUTPUT);
  attachInterrupt(BUTTON_INT, changeKey, RISING);
  Timer1.initialize(500000);
  Timer1.attachInterrupt(changePitch);
  
}
void changeKey()
{
  octave_multiplier = 1;
  if (key == NOTE_C)
  key = NOTE_D;
  else if (key == NOTE_D)
  key = NOTE_E;
  else if (key == NOTE_E)
  key = NOTE_F;
  else if (key == NOTE_F)
  key = NOTE_G;
  else if (key == NOTE_G)
  key = NOTE_A;
  else if (key == NOTE_A)
  key = NOTE_B;
  else if (key == NOTE_B)
  key = NOTE_C;
}
void changePitch()
{
  octave_multiplier = octave_multiplier * 2;
  if (octave_multiplier > 16 ) octave_multiplier = 1;
  tone (SPEAKER, key*octave_multiplier);
  
}
void loop ()
{
  Serial.print("Key: ");
  Serial.print(key);
  Serial.print(" Multiplier: ");
  Serial.print(octave_multiplier);
  Serial.print(" Frequency: ");
  Serial.println(key*octave_multiplier);
  delay (100);  
}

the code for the sound interrupt lab.

there sounds comping out from the speaker so i assume it was working