Dane has another interesting project that asks the question “Can PWM from a simple micro-controller duplicate complex sounds?” The answer is yes, with surprising results.

Wouldn’t it be sweet if you could have your micro play back complex things, over audio for an extremely low cost? Imagine replacing that one i/o line that used to drive an led, be able to reproduce the human voice and exclaim “Hello world”,

PWM with an AVR – Link


  • ian

    This is a really great project. Its inspired me to no end.

  • Dan

    Why not use the lines to clock a frequency to voltage chip, if your micro controller is fast enough?

  • TD

    Vocal sounds include components at many different frequencies all expressed at the same time. A V to F converter can produce a single tone at any given time. It can not duplicate anything that sounds like human speech.