Chapter 1 LED
================

**Description**
This chapter is the Start Point in the journey to build and explore ESP32-S3 
WROOM electronic projects. We will start with simple “Blink” project

Project 1.1 Blink
---------------------
In this project, we will use ESP32-S3 WROOM to control blinking a common LED.

Component List
---------------
- ESP32-S3-WROOM x1
- GPIO Extension Board x1
- 830 Tie-Points Breadboard x1
- LED x1
- Resistor 220Ω x1
- Jumper Wire x2

Component knowledge
^^^^^^^^^^^^^^^^^^^^
:ref:`LED <cpn_led>`
""""""""""""""""""""

:ref:`Resistor <component_resistor>`
"""""""""""""""""""""""""""""""""""""

:ref:`Breadboard <cpn_breadboard>`
""""""""""""""""""""""""""""""""""

Connect
--------
First, disconnect all power from the ESP32-S3 WROOM. Then build the circuit 
according to the circuit and hardware diagrams. After the circuit is built and 
verified correct, connect the PC to ESP32-S3 WROOM.

CAUTION: Avoid any possible short circuits (especially connecting 5V or GND, 3.3V 
and GND)! WARNING: A short circuit can cause high current in your circuit, generate 
excessive component heat and cause permanent damage to your hardware!

.. image:: img/connect/1.png

Sketch
-------
According to the circuit, when the GPIO2 of ESP32-S3 WROOM output level is high, 
the LED turns ON. Conversely, when the GPIO2 ESP32-S3 WROOM output level is low, 
the LED turns OFF. Therefore, we can let GPIO2 circularly output high and low level 
to make the LED blink. 
Upload the following Sketch:
:file:`LAFVIN_Super_Starter_Kit_For_Esp32_S3\\Sketches\\01.1_Blink`
Before uploading the code, click "Tools", "Board" and select "ESP32S3 Dev Module ".

.. image:: img/0/device.png

Select the serial port. Note that the computer port number of each user may be 
different. Please select the correct serial port according to your computer. Taking 
the window system as an example, my computer recognizes that the communication 
interface of the ESP32-S3-WROOM is COM3, so I select COM3.

.. image:: img/0/port1.png

.. note:: 
    Note: For macOS users, if the uploading fails, please set the baud rate to 
    115200 before clicking “Upload Using Programmer”.

    .. image:: img/0/speed.png

**Sketch_01.1_Blink**
Click the Upload button and it will compile and upload the Sketch to the ESP32-S3-WROOM.

.. image:: img/0/upload.png

Wait for the Sketch upload to complete, and observe the ESP32-S3 WROOM. You can 
see that the LED on breadboard flashes cyclically.

.. image:: img/phenomenon/1.png