Hi,
I want to connect the piezo buzzer as a sensor to the microcontroller. It fact it should be an input device for a simple electronic drumkit for my son (8 Piezos -> USB MIDI -> Linux PC -> ZynAddSubFx or FluidSynth). I'd like to use the USB MIDI based on:
formatting link
I've taken some measurements of the signal provided by the 27mm piezo buzzer, and finally I've decided to use the following scheme to connect it: (ASCII diagram, use non-proportional font to see it).
| X | Graetz bridge R1 .-+ X +-----o-->|--o------o--+===+--o---> Output | | X | | | | | | piezo .--+-->|--. --+-- .+. | | | --+-- C1 | | R2 .--------o .--|