Nextion displays are programmable Touch displays with simple TX/RX communication.
This display can be easily interfaced with STM , RASPBERRY PI , ARDUINO &other microcontrollers.
Graphical interface is easily generated using NEXTION EDITOR & touchable events are programmed.

ARDUINO CODE_SAMPLE_LEDONOFF_PROJECT

http://www.alselectro.com/files/Ardui...

NEXTION EDITOR & LIBRARY :

https://nextion.itead.cc/resources/do...

INKSCAPE IMAGE EDITOR :

https://inkscape.org/

NOTEPAD ++ : https://notepad-plus-plus.org/