KY-036 Metal Touch Sensor
KY-036 Metal Touch Sensor
Touch Detection Simple Switch Arduino Compatible
What is KY-036?
The KY-036 is a metal touch (human body touch) sensor module that detects when a conductive object (like a finger or metal) touches its sensing surface.
It acts like a touch-based switch Common in Arduino sensor kits
Used for simple human-machine interaction systems
Working Principle
The module uses a transistor-based detection circuit
When a finger touches the metal pad:
Electrical conductivity changes
Signal is amplified and detected
The module outputs a signal based on this change
Internal Components
LM393 comparator IC
Potentiometer (for sensitivity adjustment)
Indicator LEDs
Pin Configuration
Typical 4 pins:
VCC 3.3V 5V
GND Ground
DO Digital Output
AO Analog Output
Can be used with both digital and analog signals
Output Behavior
No touch default state (HIGH or LOW depending on module)
Touch detected output changes state
Digital output works like a button switch Analog output gives touch intensity level
Technical Specifications
Operating Voltage: 3.3V 5.5V
Typical Voltage: 5V
Analog + Digital
Sensitivity: Adjustable via potentiometer
Signal Channel: Single-channel output
Key Features
Detects human touch or metal contact
Adjustable sensitivity
Digital + analog outputs
Onboard LED indicators
Low cost and easy to use
Compatible with Arduino, ESP8266, ESP32
Applications
Touch-controlled switches
Security alarm triggers
Interactive projects
DIY touch buttons
Human-machine interfaces
Advantages
Simple design and easy interface
Low power consumption
Works as a contactless button alternative
Adjustable sensitivity
Limitectrical noise
Can give false triggers in humid environments
Not as stable as capacitive touch sensors
Requires calibration for best performance
Important Notes
Works best when touched directly
Sensitivity must be adjusted properly
Avoid long wires (can cause noise issues)
Not suitable for precise touch measurement
Summary
The KY-036 Metal Touch Sensor is a basic touch detection module that:
Detects contact using conductivity Outputs digital/analog signals Works like a simple touch switch
Ideal for beginner Arduino projects