Piano Program

Projects Programming
1

Hello everyone,

I was wondering what was wrong with my program. Whenever I run it, it works fine but doesn't output sound. I am using a UDOO (modified Arduino Due) which means that I can't use the tone command. Here is the program:

int speakerPin = 9;

int length = 1; // the number of notes
char notes[] = "c"; // a space represents a rest
int beats[] = { 1 };
int tempo = 300;

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(23, INPUT); //Make buttons here---|
  pinMode(27, INPUT); //                    |
  pinMode(31, INPUT); //                    |
  pinMode(35, INPUT); //                    |
  pinMode(39, INPUT); //                    |
  pinMode(43, INPUT); //                    |
  pinMode(47, INPUT); //--------------------|
}

void loop() {
  if (23 == HIGH) {
    playNote(notes['g'], 1);
  }
  if (27 == HIGH) {
    playNote(notes['f'], 1);
  }
  if (31 == HIGH) {
    playNote(notes['e'], 1);
  }
  if (35 == HIGH) {
    playNote(notes['d'], 1);
  }
  if (39 == HIGH) {
    playNote(notes['c'], 1);
  }
  if (43 == HIGH) {
    playNote(notes['b'], 1);
  }
  if (47 == HIGH) {
    playNote(notes['a'], 1);
  }
}

If anyone could post help, that would be great!

Thanks, Kelley

2 
    delayMicroseconds(tone);

What is tone? As far as I know, tone is a function pointer. I can't imagine that delayMicroseconds() expects a function pointer.

3

Saying I'am using a modified due is not help full What are the mods, why can't you use tone?

Mark

4

tone is here just a variable, but please note there is also a tone() function - http://arduino.cc/en/Reference/tone -

With request to your output question:
What kind of speaker do you use?
You cannot just connect a 8 ohm speaker to any uProc.!

(just a check of code)
an A = 440 Hz ==> so the (micro) delay should indeed be about 1136 microseconds.

5 
if (23 == HIGH)

That doesn't seem very likely, does it?

6

To answer everyone's questions, the program I used is just the melody tutorial (http://www.arduino.cc/tutorial/melody) edited. The delaymicroseconds(tone) is just one of the things I just don't understand. The tone() function is a function that doesn't work with the arduino due. It just says error: tone is not defined My udoo doesn't have anything different with it involving the arduino due side of it also. The speaker I use is a Panasonic sb-pm19 speaker. I didn't say this earlier, but I am trying to make a piano with these buttons. When I press the buttons, they don't make any sound.

7

When I press the buttons, they don't make any sound.

Buttons generally don't.

Did you read my last reply?

8

So, what about the questions raised in the other replies?

What is tone that you are now using?
Where are you actually reading the pins that the switches are attached to?