Project23.TAP Module
=======================

Description
------------
This module is a knock sensor. When you knock it, it can send a momentary signal.
You can combine it with Arduino to make some interesting experiments, e.g. electronic drum

Specification
--------------
- Working voltage: 5V
- Size: 30*20mm
- Weight: 3g

Connect
--------
.. image:: /img/connect/23_bb.png

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

    int Led=13;//define LED interface
    int Shock=3;//define knock sensor interface
    int val;//define digital variable val
    void setup()
    {
    pinMode(Led,OUTPUT);//define LED to be output interface
    pinMode(Shock,INPUT);//define knock sensor to be output interface
    }
    void loop()
    {
    val=digitalRead(Shock);//read the value of interface3 and evaluate it to val
    if(val==HIGH)//when the knock sensor detect a signal, LED will be flashing
    {
    digitalWrite(Led,LOW);
    }
    else
    {
    digitalWrite(Led,HIGH);
    }
    }


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

.. image:: /img/phenomenon/23.jpg