Speaker Piezo Speaker

Espruino can either output square waves using PWM, or low sample rate can be output using the Waveform class.

To use a speaker with Espruino you'll have to connect it to pins marked with PWM or DAC.

Useful sources of speakers are:

  • Inside old Personal Computers. They usually also come with a wire and a Pin Strip connector attached, and look like the larger speaker in the picture above.
  • Musical Christmas cards have a small piezoelectric speaker inside them that looks like the small gold disc above. This won't be very loud.
  • Old headphones can also be a good source

Please bear in mind that Espruino can supply only 20mA at 3.3v on its outputs, so you shouldn't attach a huge speaker to it!


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