Project25.Mercury Tilt Switch
===============================

Descriptio  
------------
The KY-017 Mercury Tilt Switch module is a switch that responds to movement. It 
uses a small mercury ball that completes the circuit when the module is tilted.

Specification
--------------
- Operating Voltage	3.3V ~ 5.5V

Connect
--------
.. image:: /img/connect/25_bb.png

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

    int led_pin = 13; // Define the LED interface
    int switch_pin = 3; // Definition of mercury tilt switch sensor interface
    int val; // Defines a numeric variable

    void setup()
    {
        pinMode(led_pin, OUTPUT);
        pinMode(switch_pin, INPUT);
    }

    void loop()
    {
        val = digitalRead(switch_pin); // check mercury switch state
        if(val == HIGH)
        {
            digitalWrite(led_pin, HIGH);
        }
        else
        {
            digitalWrite(led_pin, LOW);
        }
    }


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

.. image:: /img/phenomenon/25.jpg