Sensor-Arduino Metal and Human Body Touch:

• A transistor is used by the analogue/digital KY-036 Metal Touch Sensor Module to measure variations in electrical conductivity.
• The conductivity of the transistor varies in response to a finger touching it, causing the module to output an analogue and digital signal.
• A switch that changes states when touched can be used with the digital output.
• The touch's intensity can be determined using the analogue output.
• The on-board potentiometer can be used to control the detecting threshold.
• Compatible with widely used microcontroller boards, such as Raspberry, ESP32, Arduino, and ESP8266.

Specifications:

• This module consists of a transistor to detect touch
• LM393 differential comparator to control the digital output
• 3296W potentiometer to adjust the detection threshold
• 6 current limiting resistors
• 2 indicator LEDs
• 4 male header pins
• The module features analog and digital outputs.
• Operating voltage: 3.3V ~ 5.5V
• Board Dimensions: 15mm x 36mm [0.6in x 1.4in]