Nextion TFT Display


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  1. #1
    Junior Member ChrisRowe's Avatar
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    Default Nextion TFT Display

    Hi,
    I have just started using Nextion 3.5" TFT display and thought I would let others know how quick and easy it is to put together a GUI. The display has a serial port which can run up to 115K and a touch screen facility and 16M of flash and runs at 48MHz. A downloadable editor is available to design your GUI and this can be loaded onto the display via micro SD card or via serial interface. The editor also has a debug facility.
    A 3.5" display is about 20 ...
    For more info see
    http://wiki.iteadstudio.com/Nextion_HMI_Solution

    This display and software has saved me hours of programming and gives a very professional GUI.

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  • #2
    Member basparky's Avatar
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    Default Re: Nextion TFT Display

    Sounds great! Please provide your project as example? Just a picture from your GUI and some basic information would be great!

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  • #3
    Prolific Poster charliecoultas's Avatar
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    Default Re: Nextion TFT Display

    That does look good. Anything beyond a simple LCD display always seems too complicated to me, this might be an answer?

    Charlie

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  • #4
    Fanatical Contributor Tim's Avatar
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    Default Re: Nextion TFT Display

    The thing for me is how long will it be available. The price is good and it looks like it will do what I want but I need to be able to purchase 100 a year for the next 4-5 years.
    Tim

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    Prolific Poster normnet's Avatar
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    Default Re: Nextion TFT Display

    Quote Originally Posted by Tim View Post
    The thing for me is how long will it be available. The price is good and it looks like it will do what I want but I need to be able to purchase 100 a year for the next 4-5 years.
    If a 2nd brand similar in pin outs and physical dimensions was available you could be more certain of supply.

    Nor

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  • #6
    Fanatical Contributor Tim's Avatar
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    Default Re: Nextion TFT Display

    If I went for something like this http://www.sainsmart.com/sainsmart-3...pberry-pi.html

    and rolled my own code then I can be sure I can get longevity of parts even if the connector changes as the LCD driver will still be around

    But something with custom GPU chips etc then If they go out of business then I can no longer get the parts
    Tim

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    Prolific Poster joesaliba's Avatar
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    Default Re: Nextion TFT Display

    Quote Originally Posted by Tim View Post
    The thing for me is how long will it be available. The price is good and it looks like it will do what I want but I need to be able to purchase 100 a year for the next 4-5 years.
    If you contact them they should be able to answer you. Also in large quantities they can do custom hardware for you.

    I own a 3.5" and was playing with the editor. I cannot understand exactly most of what is written in there, or the help file is not written properly or do not know if something wrong with me.

    However here are my thoughts.

    For a custom slider display, one need to draw up the slider with paint or similar software. For instance, if you need to make a fuel gauge, a drawing must be created for full, and a drawing must be created for empty. Then in the GUI, you must select both pictures in the slider menu and then when the value of the slider change, from 0 to 100, it will begin to show or hide the underlying picture of full/empty.

    The same is for the dual state button.

    One thing that for the moment all of I created was within the editor and debug there, is the reason how the display sends it's data. I have read somewhere what each byte is, for example page, button etc.. of which now I am unable to find.

    Data sent ends with 0xff 0xff 0xff.

    And in the coming days I was going to ask how do I should manage this incoming data. I am used with the `Wait' command to wait for a specific character, and then work out the followed data after that character.

    However, if I press a button on the Nextion the following data is sent to the PIC: - 0x65 0x00 0x01 0xff 0x00 0xff 0xff, and I cannot understand how to make the PIC `Wait' for the last 3 0xff and work out the 4 bytes before.

    I found this website of how to retrieve the data but it is everything in C, and I begin to feel a lot of pressure on my brain when I see C

    Another thing I did not work out is how to change the baud rate.

    Hope I see a lot of examples over here
    Regards

    Joseph

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  • #8
    Fanatical Contributor Tim's Avatar
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    Default Re: Nextion TFT Display

    For me the Nextion may be over kill. I have external buttons. The only use of the touch screen would be to enter names etc. The only useful thing would be high speed loading of screens. However since mine are pretty simple eg box's and words I think a high speed pic24 should be able to handle it.

    BTW from my experience 100 is chicken feed volumes. I buy 1000 of one item and they accept that an no less.
    Tim

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  • #9
    Junior Member ChrisRowe's Avatar
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    Default Re: Nextion TFT Display

    Hi,
    Thanks for the comments. Tim not sure about quantities but do take your point on longevity... I have attached a couple of pictures of GUI's I have been experimenting with. I agree with Joe the instruction set is not fantastic but I am able to set and retrieve info from the display easily including changing the baud rate.
    (RSOUT "baud=19200",$FF,$FF,$FF)
    Click image for larger version

Name:	DSC04947.JPG
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    Click image for larger version

Name:	DSC04948.JPG
Views:	39
Size:	25.2 KB
ID:	3029Click image for larger version

Name:	DSC04949.JPG
Views:	54
Size:	28.8 KB
ID:	3030
    The above where drawn in Inkscape and uploaded to Nextion Editor..
    Chris

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    Prolific Poster joesaliba's Avatar
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    Default Re: Nextion TFT Display

    Chris,

    How are you `filtering' out the incoming data? I am used to wait for a specific character and then work out the following data after that character. In this case, $FF are at the end of the incoming data so I cannot wait for these.

    Also I saw that (RSOUT "baud=19200",$FF,$FF,$FF) is a temporary set of the baud rate. If you use (RSOUT "bauds=19200",$FF,$FF,$FF) then this will be permanent.

    Nice setup you have done. Have you found the keyboard layout or you designed it?
    Regards

    Joseph

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    Prolific Poster joesaliba's Avatar
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    Default Re: Nextion TFT Display

    Also those triangular buttons. I tried changing the image in the button menu but there is no place, like the 2-state button.
    Regards

    Joseph

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    Default Re: Nextion TFT Display

    I totally agree with Tim on this. Any peripheral that has built in code as an interface is likely to be changed in the, sometimes near, future, making life really difficult for future builds. I've come across this situation quite a few times with differing peripherals. Some peripherals need an external interface, but, IMO, graphic LCDs don't, and it is always better to buy a device without any on-board interface and write the code that talks to the display's chipset within the microcontroller that is using it. Manufacturers rarely change the chipset controlling the display, but software developers can't help it. LOL Usually based upon commercialism. i.e. "Look! this is version 2 and it has this feature aswell!!! Even though you don't need it. Note that the original version is no longer available and version 2 will cost X extra" etc...

    For example. the KS0108 chipset is still readily available, even after nearly 20 years, and is still used in quite a few commercial products. The ILI9320 colour LCD chipset is also available after approx 10 years. etc...
    Last edited by top204; 8th May 2016 at 11:49.

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    Junior Member ChrisRowe's Avatar
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    Default Re: Nextion TFT Display

    Les absolutely agree with your comments but for us dabblers these displays give a quick and easy interface....
    Joe the keyboard I found and have adapted to the display using nextion editor . At the moment I only look for the first $FF from the display...
    I will send you the HMI file for the keyboard if you want.

    Chris

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    Default Re: Nextion TFT Display

    Yes Chris please. salibaj at maltanet dot net. Thank you.
    Regards

    Joseph

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    Default Re: Nextion TFT Display

    Hi Chris,
    Please send me the HMI file
    dumitru_teotech at yahoo dot com .
    Thanks in advance
    Teo

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