What is a piezo? Quick view of how it works.
Soldering it, using it on an acoustic instrument.
**No PCB needed and minimal components.**
How to make the waterproof piezo : https://www.youtube.com/watch?v=fQub5aY8vG0
Activate sounds with piezo : https://www.youtube.com/watch?v=cQ6WZlb8Pfg
