This is an example on how to play a raw 8bits 8KHz PCM audio sample using one of the ATmega32u4 PWM pins and the Timer3 library:

http://arduino.cc/playground/Code/Timer1

There are other examples/ways of doing this, most notably:

https://github.com/damellis/PCM/

But I couldn't make it work in Arduino Leonardo or Teensy 2.0, both based on ATmega32u4.

After reading the docs pointed in the 'references' section of this document, I found out that the same can be achieved using the Timer3 library.

The sample can be genereated with raw2c.c tool:

1. sox -V coin.wav -b 8 -t raw -r 8000 coin8.raw
2. raw2c coin8.raw coin8.h

The code has been tested with Teensy 2.0 only.

Demo: https://plus.google.com/104932008385650668491/posts/BE91htfJ1R9

• http://arduino.cc/en/Tutorial/SecretsOfArduinoPWM
• http://arduino.cc/playground/Main/TimerPWMCheatsheet
• http://arduino.cc/playground/Code/Timer1
• http://www.pjrc.com/teensy/td_libs_TimerOne.html

Juan J. Martínez [email protected]