Sketch
This code uses a library named "Freenove_WS2812_Lib_for_ESP32", if you have not installed it, please do so
first.
Library is an important feature of the open source world, and we know that Arduino is an open source platform
that everyone can contribute to. Libraries are generally licensed under the LGPL, which means you can use
them for free to apply to your creations.
How to install the library
There are two ways to add libraries.
The first way, open the Arduino IDE, click Sketch Include Library Manager Libraries.
In the pop-up window, Library Manager, search for the name of the Library, “Freenove WS2812 Lib for ESP32”.
Then click Install.
The second way，open Arduino IDE，click SketchInclude LibraryAdd .ZIP Library，In the pop-up window,
find the file named “./Libraries/Freenove_WS2812_Lib_for_ESP32.Zip” which locates in this directory，and
click OPEN.
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