TFT display with 9341 controller

Other Hardware Displays
1

I am trying to get my new display going, but without success. The only thing i see is a white screen.
Hardware:

  • Arduino Mega
  • TFT Mega Shield V1.1 from Lseestudio.
  • TFT screen type TFT_320QVT_9341.
    I bought the display and shield as a package.
    See the pictures attached.

From the type number it looks the controller type is ILI9341.

I am using UTFT and UTouch libraries from Henning Karlsen, downloaded recently, version 2.81.

In the sketch from howtomechantronics i included the line
UTFT myGLCD(ILI9341_S4P,38,39,40,41)
Also tried S5P instead of S4P.
Sketch compiles and uploads without problems.

I read a few things on this forum about changing UTFT library UTFT.h and UTFT.cpp, which may be required for this controller, but it is not fully clear to me what i should change.

I have built a few arduino projects, but never changed a library.

questions:

  • how can i be sure i have ILI9341 controller? The controller cannot be seen on the display.
  • By connecting it to the mega through the shield, does it use serial communication?
  • any tips what i could try?

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2

TFTLCDCyg has posted a modified UTFT library that supports your display.

Search for "TFT_320QVT_9341" in the box at the top right hand corner of your page.

David.

3

I made it work with the shield v2.2 (which has buffers instead of resistors), but with the v1.1, I couldn't.
Also, I made a post asking the same as you (TFT_320QVT_9341 problem with shield v1.4 - Displays - Arduino Forum)

I think that, adding some delays in initlcd of the library (UTFT/tft_drivers/ili9341/16B/) which I attach, it may work.
If you have any success let me know, please!

UTFT.zip (104 KB)

4

Sorry, I didn't see the photos.
Try with the code the I left you in the previous message. It should work.

I had the problem with shield v1.4, I was wrong about the version number.

5

I can find a v1.4 schematic and v2.0.1 schematic.

I have do not have either shield. However they both seem to use the same pinout and headers. I would think that both should work. The resistors do look rather high (10k). The TFT should work ok but the SD will probably be unreliable.

I presume that you have found the modified UTFT library from TFTLCDCyg that he has adapted for these ILI9341 displays.

David.

6

I have the exact same setup, in fact the "how to mechatronics" video is what made me get started on this.
My problem is the touch screen is nor giving me a Y axis.
Did you get yours running. I can help if you stI'll have issues with the image and screen setup but I couldn't get the touch to work properly. I am still working on this.
I have a TFT_320QVT_9341
& TFT_320QVT that both get great images with a little change in the .h file. But both have touch screens that only show data movment on the X axis.
The TFT LCD Mega Sheild v1.0 (the one with the potentiometer for the backlight)worked the best. I also tried the white one v2.2, it didn't work that well.
Note: the 10K resistance is kinda high, I bought an extra v1.0 sheld and removed the 10K for 1k resistors. It worked alot better but still no y axis.
My post is
3.2" LCD only one axis" if you want to read and reply.
I know this is an old post but someone else pointed me to it so I thought I would give it a shot.