• The KY-036 Metal Touch Sensor module is an electronic component that can detect touch or pressure on a metal surface. The module is made up of a touch circuit, a transistor, and an operational amplifier (Opamp) that amplifies the signal from the transistor. The transistor's base is left open, so when a metal surface is touched, it creates a connection to the base of the transistor, turning it on. This, in turn, activates the Opamp and sends a signal to the output pin of the module.
• The module comes with a built-in LED that is connected to the output pin of the Opamp. When the module is touched, the LED will turn on, indicating that the touch has been detected. The module is powered by a 5V power supply and can be easily connected to a microcontroller or other electronic devices using its three pins: VCC (power supply), GND (ground), and OUT (output signal).
• The KY-036 Metal Touch Sensor module can be used in various applications, such as touch-sensitive switches, interactive projects, and proximity sensors. It is a simple and cost-effective solution for adding touch detection capability to electronic projects.

Features:

• Its sensitivity is adjustable
• It has an analog and digital output

Specification:

• Model: KY-036
• Power supply: 3.3V or 5.5V
• Sensitivity: adjustable
• Sensor Type: analog and digital output
• Dimension: 34 x 16mm (L x W)

Applications:

• Touch-sensitive switch: The module can be used to create a touch-sensitive switch that turns on or off a device or a light when touched. For example, you can use it to create a touch lamp that turns on and off with a simple touch.
• Proximity sensor: The module can be used as a proximity sensor to detect the presence of a metal object in its vicinity. For example, you can use it to create a metal detector that beeps or turns on a light when it detects metal.
• Interactive project: The module can be used in interactive projects that respond to touch. For example, you can use it to create a musical instrument that produces different sounds when different parts of it are touched.
• Security system: The module can be used in a security system to detect if someone is touching or tampering with a metal object, such as a door handle or a safe. For example, you can use it to create a DIY security system that alerts you when someone touches your door handle.
• Industrial automation: The module can be used in industrial automation applications where touch detection is required. For example, you can use it to create a touch-sensitive control panel for a machine or a device that requires manual input.

Pin Connections:

Pin	Description
Digital Out	Becomes high when the base of the transistor gets touched.
Analog Out	Analog Output of the Sensor.
LED1	Shows that the sensor is supplied with voltage.
LED2	Shows that the sensor is touched.

Package Includes:

• 1 x Touch Sensor Module KY-036

Sample Project:

Circuit:

• We will be using digital signal pin, the VCC pin, and the ground of the sensor to interface it with Arduino.
• This is the circuit diagram for the KY-036 Metal Touch sensor module interface with the Arduino. We are going to connect the ground pin with the ground of the Arduino. The VCC of the sensor will be connected with the 5V of the Arduino. The digital pin of the sensor will be connected with the digital pin number 8 of the Arduino. Connect the led with pin number 13 of the Arduino I am using a 5v led, if you are using a standard 2.5 LED then don’t forget to add a resistor of 330 ohms with the LED, otherwise the LED will burnout.

Library:

• No external library is required for this module to work.

Code:

int led = 13;
int val;
int sensorpin = 9;

void setup()
{
    pinMode (led,OUTPUT);
    pinMode (sensorpin,INPUT);
}

void loop()
{
    val= digitalRead(sensorpin);
    if (val==HIGH)
    {
        digitalWrite (led, HIGH);
    }
    else
    {
        digitalWrite (led, LOW);
    }
}

References:

• http://arduinolearning.com/code/ky-036-metal-touch-sensor-module-and-arduino-example.php
• https://www.electroniclinic.com/ky-036-metal-touch-sensor-module-arduino-circuit-diagram-code/