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Nextion Displays - Introduction and Review

Nextion Displays are easy to use Human Machine Interface(HMI) device. It is the best display module not only for beginners also for experts. They come with an interface board consisting of flash memory starting from 4 MB to 32 MB and a TTL serial communication port to interface with MCU like Arduino, Raspberry Pi, ESP32. The inbuilt flash memory comes handy when we are working on complicated projects and designing great GUI.


The Nextion Editor software can be used for creating GUI. It is free software that can be downloaded from their website(click here to go to the download page). With this editor, we can develop the HMI GUI by drag and drop components (graphics, text, buttons, sliders, progress bars, images, etc.)


Let's make this simple. Let's talk about its advantages,

  • Built-in flash memory to design and code GUI.
  • Available in various TFT LCD display sizes including 2.4”, 2.8”, 3.2”, 3.5”, 4.3”, 5.0”, 7.0”. With a large selection to choose from, one will likely fit your needs. 
  • Free, simple and lightweight software to create HMI GUI.
  • 2 wire(TX, RX) communication with MCU. Which makes easier for Arduino UNO like MCU having fewer GPIO pins.
  • The enhanced version of Nextion comes with Real Time Clock(RTC) built-in. Hence we don't need to buy an RTC module for our project.
About its disadvantages,
  • Not that flexible like normal displays, Because it displays only what the software can do. 
  • Customer support forums are not worthy.

Review

 Well, I spent a lot of time with these display modules and some other display modules. So in my opinion, these displays are great. But I felt the resources are not quite good. If you a bit of logical mind, you can learn it by yourself. If you want a display that acts as a human machine interface HMI GUI, these displays are great. Or if you want to represent various forms of graphical functions etc, you have to go with the conventional one.



If you are doing an IOT or HMI GUI based project, this will be the best suit for you. If you are planning to buy one, go for the enhanced version, it will cost you a few hundred Rupees(if you are in INDIA) more but it will give you more flash memory which will be required for your project. the basic version gives you 4 MB of flash were an enhanced version gives you 16 MB. that is a huge difference when you start to design GUI. I will provide you the BEST BUY link for Nextion displays.

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