Compilation error: demos/lv_demos.h: No such file or directory

First, you need to install the lvgl library. There're 2 ways to install it
a. copy the lvgl-3 folder we provided to the Arduino libraries directory. To find the correct directory, you can open Arduino IDE→click Files→click Preferences

b. open Arduino IDE, then open libraries manager and search for lvgl. Select a version and install

Then, you need to copy the "examples" and "demo" folders to the "lvgl/src" directory. For detail, please refer to: https://docs.lvgl.io/master/integration/framework/arduino.html

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