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Sound Effect
===============================

PiCar-X has a built-in speaker that can be used for audio experiments. Ezblock allows users to enter text to make the PiCar-X speak, or make specific sound effects. In this tutorial, the PiCar-X will make the sound of a gun firing after a 3-second countdown, using a do/while function.

**TIPS**

.. image:: img/sp210512_144106.png

Use the **say** block with a **text** block to write a sentence for the PiCar-X to say. The **say** block can be used with text or numbers.

.. image:: img/sp210512_144150.png

The **number** block.

.. image:: img/sp210512_144216.png

Using the **repeat** block will repeatedly execute the same statement, which reduces the size of the code.

.. image:: img/sp210512_144418.png

The **mathematical operation** block can perform typical mathematical functions, such as ”+”, “-”, “x”, and “÷ “.

.. image:: img/sp210512_144530.png

The play **sound effects - with volume - %** block has preset sound effects, such as a siren sound, a gun sound, and others. The range of the volume can be set from 0 to 100.

**EXAMPLE**

.. note::

    * You can write the program according to the following picture, please refer to the tutorial: :ref:`ezblock:create_project_latest`.
    * Or find the code with the same name on the **Examples** page of the EzBlock Studio and click **Run** or **Edit** directly.


.. image:: img/sp210512_144944.png