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One day lost to look for a tutorial and explaination about Nextion

Grrrr,  It start bad !

A lot of question


I need a Nexion touch Screen ( with finger not with pen)

It is available in 4.3" or in 5"?


Well,  now I use my own dev card with Atmel M644  or M1284.

if I understand well

The nextion editor it used to develop page/screen with push button, radio button and so one.. then the HMI  and/or TFT files are dowloaded to a SD card ? Right?

Then My Atmega send and receive data to the nexion via Ascii char and the rx tx wires ? right ?

the baud rate is adjustable


I would like to know also what kind of RTC is used ?


 I download the last update version of Nexion editor, when I download the sample for 5" or 4.3" the debug said it is a old version  so I cant use it ?


Many thanks for your answers

I assume Nexion is a good product , and when I will started I will happy. but I need some good help to start !

JP


Compiled HMI project is a TFT file, uploaded to Nextion device microSD or TTL serial.

Resistive touch does accept finger, but not like capacitive

Capacitive dates are not yet known - size 7.0" first, 4.3" next (was June~ish)

Nextion Instruction Set explains which baudrates are supported

RTC used is only in Enhanced Series, and is the Real Time Clock kind.

Sample file is v0.32 to allow device to be selected - must save before build process.


Nextion is only a good product when being used as HMI (Human Machine Interface)

 - if and only if, you wish for reasonably priced device compared to $1000 Samsung

 - if and only if, you wish for text-based human understandable command set

 - if and only if, you want to save time in GUI development, process MCU side

 - if and only if such project isn't trying to be a cell phone or desktop.

 - if and only if goal to reduce wire count down to two (serial is slower)

   but Nextion compensates for with fast graphic processing Nextion side.


Nextion Quick Start Guide is available from Help menuitem of Help Menu

 - as is most important documents (datasheets) and good threads.

 - Nextion Instruction Set is key to success


Nextion Questions this forum

 - MCU language, compiler, programming, electronics - not this forum


Button on canvas has two touch events - Press/Release

 - in each desired event to inform MCU check Send Component ID

   Nextion will send 0x65 Return Data as per Nextion Instruction Set

   Handle in MCU side code

With such quick and simple - HMI designs are made rapidly, hours not weeks


More advanced topics will require more time and user effort.


Hope this is helpful



1 person likes this
Hello,
Yes is helpful I will work a little bit more on the editor before buying one   
Many thanks
JP

Example:

  OpenSource Fishtank project

   - entire HMI is made with "checking" Send Component ID

   - the MCU responds as required to incoming 0x65 Return Data

   - Graphic and Fonts are stored Nextion side

     as such swapping on pic "on" for another pic "off" is fast

     MCU might sent p0.pic=3ÿÿÿ for on and p0.pic=2ÿÿÿ for off

   - Changing HMI pages

     MCU might send page 2ÿÿÿ to switch to page 2

   - Update a temperature (integer not float)

     MCU might send n0.val=27ÿÿÿ

     slightly more advanced float with degree and scale

     MCU might send to text component t0.txt="27°C"ÿÿÿ

   Update to synchronize time

      rtc0=2017ÿÿÿ

      rtc1=4ÿÿÿ

      rtc2=18ÿÿÿ

      rtc3=12ÿÿÿ

      rtc4=28ÿÿÿ

      rtc5=30ÿÿÿ

Favourite Graphic program is  useful indeed.


   Some layouts are extremely quick

      pic page of all components in on state

      pic page of all components in off state

      then use a crop image to toggle area between these two pics.


Most code will normally be MCU side

 - but we also discover that Nextion side Logic is very capable (advanced)


Nextion side Function in very little time

 - tweaking to make it pretty... well lots of time can be invested in

 - Transfering MCU logic to Nextion Logic

      is at times useful, but not needed for project to be functional

      much time can be invested into having Nextion be more than screen

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