GUIProgramming < IoT_Course

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---+ GUI programming with LVGL
---++ Introduction

Very often, the microcontroller part of an !IoT project allows user interaction only though the network connection, e.g. through a program with graphical user interface (GUI) on a PC. Sometimes however, it may be interesting to be able to interact with the device also locally.

The !LoLin 2,4" TFT display has 320x240 pixels and an integrated touch screen (see [[TFT display]]. This device is powerful enough to run graphical user interfaces.
---++ LVGL

Most GUI libraries require computing resources which are simply not available on a microcontroller. The %BLUE%Li%ENDCOLOR%ght and %BLUE%V%ENDCOLOR%ersatile %BLUE%G%ENDCOLOR%raphics %BLUE%Li%ENDCOLOR%brary ( [[https://docs.lvgl.io/latest/en/html/index.html][LVGL]]) however, has been designed to be used on such resource restricted devices. The library is written in C but a !MicroPython language binding is available.

Adding the library to the !MicroPython firmware is not exactly trivial and therefore a special version of !MicroPython, [[https://github.com/lvgl/lv_micropython][lv_micropython]], has been developed, integrating everything that is needed to access LVGL from !MicroPython. LVGL comes with a big number of small example programs showing the use of all of its widgets (GUI components) written in C and in !MicroPython.

-- %USERSIG{UliRaich - 2022-05-23}%

---++ Comments

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Topic revision: r1 - 2022-05-23 - UliRaich