This "momentary" capacitive touch sensor is the simplest way to add user input to a project without using a button. No microcontroller is required here - just power it with 3.3 to 5.5VDC and touch the pad to activate the sensor.
The sensor-pad area is connected to a dedicated, single-button capacitive sense chip to detect capacitive load. As long as a touch (e.g., from a finger) is detected, the output pin goes high.
Comes with a fully assembled board with 2.54mm male header.
Dimensions: 24 x 24mm