Reduce the voltage with a Zener diode. Put a 10 kΩ resistor in series with the Zener diode to limit the current to the Zener. The capacitor and the second resistor will debounce the signal, avoiding erratic signals from the switch when pressing and releasing.

^{simulate this circuit – Schematic created using CircuitLab}

Reduce the voltage with a Zener diode. Put a 10 kΩ resistor in series with the Zener diode to limit the current to the Zener. The capacitor and the second resistor will debounce the signal, avoiding erratic signals from the switch when pressing and releasing.

^{simulate this circuit – Schematic created using CircuitLab}

If you are using a power supply with screw terminals (not plug in like on the Ali Express website), you can do the following: Use the ground of the power supply and leave the V- not connected. Both schematics show a touch sensor switch (with the additional ground line).

ATTENTION: Do not use the "C" connections as ground.

^{simulate this circuit}

Reduce the voltage with a Zener diode. Put a 10K resistor in series with the Zener diode to limit the current to the Zener. The capacitor and the second resistor will debounce the signal, avoiding erratic signal from the switch when pressing and releasing.

^{simulate this circuit – Schematic created using CircuitLab}

Reduce the voltage with a Zener diode. Put a 10 kΩ resistor in series with the Zener diode to limit the current to the Zener. The capacitor and the second resistor will debounce the signal, avoiding erratic signals from the switch when pressing and releasing.

^{simulate this circuit – Schematic created using CircuitLab}