PCM.h and pin 3

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1

hi i am using a library called PCM, but my pin 11 is full so PCM.C
I changed the SpeakerPin and the Fast PWM in "void StartPlayBack" to 3, but I took 2 clicks from the buzzer and the sample did not come. what did i do wrong i troubleshoot but i found nothing broken

PCMPin3.zip (26.4 KB)

3

Changing "speakerPin = 11" to "speakerPin = 3" is not enough. You also have to change "OCR2A" to "OCR2B" and you have to turn on PWM on OC2B instead of OC2A. Change:

  // Do non-inverting PWM on pin OC2A (p.155)
  // On the Arduino this is pin 11.
  TCCR2A = (TCCR2A | _BV(COM2A1)) & ~_BV(COM2A0);
  TCCR2A &= ~(_BV(COM2B1) | _BV(COM2B0));

to:

  // Do non-inverting PWM on pin OC2B (p.155)
  // On the Arduino this is pin 3.
  TCCR2A |= _BV(COM2B1); // Turn on COM2B1
  TCCR2A &= ~_BV(COM2B0); // Turn off COM2B0
  TCCR2A &= ~(_BV(COM2A1) | _BV(COM2A0));
5

also i try again but, no sound from the buzzer

6

Does the "playback" example that comes with the PCM library work on Pin 3 after you make the changes? If that works, the problem is probably caused by something else in your sketch.

7

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