Project33.Metal Touch Sensor Module
=====================================

Description
------------
The KY-036 Metal Touch Sensor Module is an analog/digital sensor that uses a 
transistor to detect changes in electrical conductivity. When the transistor is 
touched with a finger, the conductivity changes and the module emits a digital 
and analog signal.

The digital output can be used a switch that changes state when touched. The 
analog output can measure the intensity of the touch. The detection threshold 
can be regulated using the on-board potentiometer.

Compatible with popular microcontroller boards like Arduino, ESP32, ESP8266 and 
Raspberry.

Specification
--------------
- Operating voltage	3.3V ~ 5.5V
- Board Dimensions	15mm x 36mm

Connect
--------
.. image:: /img/connect/33_bb.png

Code
-----
.. code-block:: c

    int digitalPin = 7;   // KY-036 digital interface
    int analogPin = A0;   // KY-036 analog interface
    int ledPin = 13;      // Arduino LED pin
    int digitalVal;       // digital readings
    int analogVal;        // analog readings

    void setup()
    {
    pinMode(digitalPin,INPUT); 
    pinMode(analogPin, INPUT);
    pinMode(ledPin,OUTPUT);      
    Serial.begin(9600);
    }

    void loop()
    {
    // Read the digital inteface
    digitalVal = digitalRead(digitalPin); 
    
    if(digitalVal == HIGH) 
    {
        digitalWrite(ledPin, HIGH); // Turn ON Arduino's LED
    }
    else
    {
        digitalWrite(ledPin, LOW);  // Turn OFF Arduino's LED
    }

    // Read analog interface
    analogVal = analogRead(analogPin);
    Serial.println(analogVal);  // Print analog value to serial

    delay(100);
    }

Phenomenon
-----------

.. image:: /img/phenomenon/33.jpg