Piezos make noise when you put an AC voltage across them: and the bigger the voltage used the louder they are. We found the nifty PAM8904, which is an amplifier specifically designed for driving piezo elements. We whipped up a quick breakout in our 2mm JST-PH STEMMA form-factor to make it easy for anyone who wants to beep their boops very loudly.
The Adafruit STEMMA Piezo Driver Amp guide has everything you need to get started with using the breakout with your piezo elements. There’s pages for overview, pinouts, CircuitPython and Python, Arduino and resources for download.
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