It's a simple module that can be easily integrated into a circuit, it can be connected to an MCU (microcontroller unit) using just three pins: VCC, GND and Signal. The signal pin goes high when the sensor is touched and goes low when the touch is removed. It can be used in a variety of applications where touch sensing is required such as buttons, touchscreens, and other human-machine interfaces.

KY036 Metal Touch Sensor Module Human Touch Sensor For Arduino

The KY-036 Touch Sensor Module utilizes a floating lead on a Darlington transistor to detect a touch. There are 2 LEDs on board. A red LED lights when power is applied. A green or red LED lights when a touch is detected.

Features:

1. Main chip: LM393
2. Working voltage: for DC 5V
3. Single-channel signal output
4. Low-level output signal used for human body touch sensor alarm
5. Adjustable sensitivity
6. Pin Connector to board: 4 Pins