piezo disc beeper horn

thingiverse

If you attach one of these raw piezo speaker discs to your Arduino tone output, it simply won't be very loud at all. Try slipping a horn housing onto this setup instead - suddenly, things will really start making some noise. This little guy is specifically made for a 20mm diameter piezo element. Just shrink that down in your slicer software if you need something smaller. Tucked away down inside here is a teeny-tiny square on the bottom, perfect for mounting a small circuit board if you're into that sort of thing. If your piezo happens to have cables, just connect 'em up to the outer contacts where it says. On the other hand, if it doesn't come with any leads, you can wind some copper wire into a tiny spring and solder those on instead - works like a charm! Need super-tiny circuits? Well, slap your beep circuit in right here. Don't be afraid to get experimental and try out all sorts of different frequencies till you find the one that really makes this horn sing - and what you'll discover is that's actually its resonance frequency, completely unique from what happens with the pure disc. Once you've finished testing it all out, go ahead and glue those two parts together tightly. Our test examples were made from PLA in a brilliant blue color or ABS in a range of red, yellow, and acetone-finished varieties - none needed any support whatsoever.