We've itching to get the chance to play with the Adafruit Trinket, which is a tiny microcontroller that is only 3 cm by 1.5 cm (1 inch by 0.5 inch). We were playing around with our little Piezo speakers and thought it would be fun to drive one with a Trinket.
It turns out that this is very easy to do!
0) We soldered the header pins to the Trinket
1) We found a sketch on Pastebin with the Star Wars Imperial March song. Somebody took the time to record all the frequencies needed to play that song, and we are grateful to them.
2) We downloaded Adafruit's Arduino IDE version 1.05. There are ways to patch your existing Arduino install, but it is much more difficult.
3) We modified the code from Pastebin to use Pins 1 and 2 from the Trinket. Pin 1 maps to the built-in LED and Pin 2 is how we drove the speaker
4) We scrounged up a mini-USB cord and tried to upload the sketch. It turns out that the Trinket doesn't like USB 3.0 in some cases, so after a few tries we ran it through a USB 2.0 hub. Be sure to tap the bootloader button on the Trinket prior to trying to upload the sketch.
It was that easy! Here is a video of the result.
I am trying this out on my little Trinket and the sound coming out of it sounds sluggish and slow. Is there something in the code that I would need to tinker with to get it to sound more like yours?
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May 01, 2014
It sounds like you might have a hardware issue. We actually found that using a different pin on the Trinket helped. This might be because the LED on the Trinket is linked to Pin 1.