capacitive

Documentation

Overview

Capacitive touch sensing example.

This capacitive touch sensor works by charging a normal GPIO pin, then slowly discharging it through a 1MΩ resistor and seeing how long it takes to go from high to low.

Use as follows:

• Change touchPin below as needed.
• Connect this pin to some metal surface, like a piece of aluminimum foil. Make sure this surface is covered (using paper, Scotch tape, etc).
• Also connect this same pin to ground through a 1MΩ resistor.

This sensor is very sensitive to noise on the power source, so you should probably try to limit it by running from a battery for example. Especially phone chargers can produce a lot of noise.