In this project a TTP223 Touch sensor is interfaced with Arduino uno board to control home lights with just a touch.

A touch sensor is a touch-sensitive module which has 3 input/output pins. Power up this module by connecting the Vcc pin and ground pin to the 5V and ground of the Arduino.

An Arduino Uno capacitive touch sensor module detects touch through changes in capacitance. It provides a digital signal when touched, used for creating touch-sensitive interfaces and controls in ...

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This Capacitive Touch Keyboard project explains how you can make a portable device that performs different keyboard operations.

The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

In this Arduino IR sensor module tutorial we are explaining how to connect IR sensor module with Arduino Uno and write the code to get the IR motion sensor working.

Capacitive touch sensing allows for triggering the sensor without actually physically touching one’s lips to the electrodes, which [Nathan] did by putting a clear plastic layer over the PCB traces.