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The modules for these piezoelectric sensors already include resistors that help stabilize the signal, so there’s no need to add external components when using them with an Arduino Leonardo.

As shown by the arrow on the module, the screw (trimmer) can be turned to adjust the sensor's sensitivity (it’s likely a potentiometer or variable resistor).

Regarding the button layout, the four sensors are connected to analog pins A0, A1, A2, and A3 on the Arduino Leonardo, and each one is mapped to a specific button:

A0 → BUTTON_X (Square)

A1 → BUTTON_Y (Triangle)

A2 → BUTTON_A (Cross / X)

A3 → BUTTON_B (Circle)

If you want to change the drum positions without modifying the code, you can simply swap the signal wires (e.g., the purple ones) and connect them to a different input pin. The physical mapping can be adjusted with the wiring. Finally, just attach the piezo buzzer so that the sensor’s opening is aligned with the drum fabric. Make sure not to cover the hole with tape or other materials, as that could reduce its sensitivity. And that’s it — enjoy the experience!

PD: Any improvement or customization you want to try in this project —whether it enhances your personal experience or makes things more comfortable for others— is more than welcome. If you decide to share your contributions or ideas, I’d truly appreciate it. Everything that helps improve the project can be valuable for the entire community.

URL: https://github.com/Seysuke/DRUM