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.. _cpn_button:

Button
==========

.. image:: img/button_1212.png
    :width: 400
    :align: center

Buttons are a common component used to control electronic devices. They are usually used as switches to connect or break circuits. Although buttons come in a variety of sizes and shapes, the one used here is a 6mm mini-button as shown in the following pictures.
Pin 1 is connected to pin 2 and pin 3 to pin 4. So you just need to connect either of pin 1 and pin 2 to pin 3 or pin 4.

The following is the internal structure of a button. The symbol on the right below is usually used to represent a button in circuits. 

.. image:: img/button_symbol.png
    :width: 400
    :align: center

Since the pin 1 is connected to pin 2, and pin 3 to pin 4, when the button is pressed, the 4 pins are connected, thus closing the circuit.

.. image:: img/button_1212_size.png
    :width: 600
    :align: center

**Example**

* :ref:`ar_button` (Basic Project)
* :ref:`sh_doorbell` (Scratch Project)
* :ref:`sh_eat_apple` (Scratch Project)
* :ref:`sh_fishing` (Scratch Project)