2.4 inch TFT touch LCD Screen Module For Arduino UNO R3 SD low price jocks

casemod · June 28, 2014, 8:08am

berni_: The first differene is that the first one is working well with Adafruit and UTFT (GEEK24 model selected). The 2nd is not working at all.

... We certainly cannot guess what you are using. Care to post all the required libraries you used? UTFT is a large library suited to several displays, micro-controllers and pinouts, even with the right model selected, there are different pinouts, plus we dont know if you are using an uno, a mega or anything in between.

berni_: Below some pictures that shows differences and similarities. Same manufacturer mcufriend.com. The not working display seems to have a different controler. It answer 7777 when adafruit library is checking the model. On le left: the NOT WORKING display, on the right, the display is OK

I have both and you are right the display is different, but it still complies with the ST778x command set as described on previous posts. As far as i know they are not supported by UTFT, however it may be that one of the LCD's has an extended command set, for example, some are known to be compatible with ILI9325. I have no idea what controller the GEEK24 model uses, this should be your first mystery to be solved - why are you using it and who told you it would be compatible?

casemod · June 30, 2014, 1:31pm

Ive just ported these displays to a different platform and used the ILI9325 library as my reference.

In order to get both types to work with such library the following registers need to be changed on the ILI9325.cpp file:

Register 0x90 - Change Value to 0x0033 Register 0x02 - Change value to 0x0700

This should allow UTFT and similar libraries to be used with these displays

system · April 18, 2021, 4:07pm

For the TFTLCD from mcufried.com as sold on the cheap via various providers, attached is a complete working sketch with drivers and examples:

TFTLCD using st7783 driver
resistive touchscreen
SD, including images to be stored on micro-SD card

st7783.zip (1.53 MB)

casemod · July 5, 2014, 7:07pm

arduhckr: For the TFTLCD from mcufried.com as sold on the cheap via various providers, attached is a complete working sketch with drivers and examples: - TFTLCD using st7783 driver - resistive touchscreen - SD, including images to be stored on micro-SD card

The actual driver was already posted on #13, but thanks for the contribuition

mikiray · July 7, 2014, 11:07am

Hello, I buyed the display mcufriend and I'm trying to make it work. I think it's an error on the example tftpaint on line 97: "Point p=..." should be "TSPoint p=..." ?

mikiray · July 7, 2014, 5:23pm

It works good! Sorry, after some try I noticed that there was 2 libraries called "TouchScreen" in my IDE. Thank you.

berni · July 13, 2014, 4:05pm

Thank you arduhckr, yout last post makes both displays working!

system · July 14, 2014, 4:34pm

From my understanding after a test of the sd card part of this board the logic of the sdcard is 3.3V, so should not work without "Bi-Directional Level Shifter / Logic Level Converter". Has any of you guys made it work on 5V arduino?

casemod · July 14, 2014, 8:46pm

magnetman:
From my understanding after a test of the sd card part of this board the logic of the sdcard is 3.3V, so should not work without “Bi-Directional Level Shifter / Logic Level Converter”. Has any of you guys made it work on 5V arduino?

The board feeds the SD with 5V signals and 3.3V power, so you need an SD card with 5V tolerant pins. Most are, but do check.
I can confirm the reader on this shield does work.

system · April 18, 2021, 4:07pm

I have (what appears to be) exactly same board.
Drawing example works but there are weird rainbow stripes across the screen.
Anyone knows how to fix this, or at least where to look for a bad connection/short?

casemod · July 22, 2014, 5:24pm

paulftw:
Anyone knows how to fix this…?

Post #14.

system · July 23, 2014, 1:30am

casemod: Post #14.

Thanks casemod, you are awesome. For anyone in the same boat as me - I was using a buggy version of TFTLCD. Haven't tried the sketch linked to in Reply #14, but half way through this tread someone attached their sketch a file named st7783.zip.

I've fixed a couple of compile time errors by removing glcdfont.c and usage of it in drawChar. It now works great.

system · April 18, 2021, 4:07pm

Hi guys!
I also have the same board (advertised for spdf5408 controller).
I got it (quite) working with UTFT and with TFTLCD, but there is an error in how pixel are drawed.
Looks like it shifts of some pixel every some lines while drawing…
Check the image.
Any advice?

Stefano

casemod · August 1, 2014, 7:35pm

stez90: Any advice?

Best advice is to read the Thread!! Have you seen post #14?

system · August 1, 2014, 8:11pm

Yes I have! I tried almost all of the attached libraries/sketch.. I also tried the code snippet from misc.ws and my display says "Unknown driver chip 7783". Maybe my TFT is damaged, it shows banding (lots of, not very visible in attached images).. :(

casemod · August 1, 2014, 8:32pm

stez90: Yes I have! I tried almost all of the attached libraries/sketch..

And those are? And forget UFTF, unless you modify the library yourself.

stez90: I also tried the code snippet from misc.ws and my display says "Unknown driver chip 7783".

Thats what the controller is, as mentioned on post #11. I dont know why the chinese guys keep mentioning the other controller... But for the price is the best display you'll get your hands on, so worth the hassle.

stez90: Maybe my TFT is damaged, it shows banding (lots of, not very visible in attached images).. :(

Seems very heathy to me. One of the initialization commands is wrong tough. I find it hard that the libraries for the ST778x are not working. Try the link on post #13 and report. What IDE version are you using?

Did you install the "ADAFRUIT_GFX" library?

system · August 1, 2014, 8:48pm

It was the Adafruit Gfx the problem. But before it gives me no error when compiling, and i didn't find any reference to it in the thread.. :~ Now I have problem with the touch, but that is another story :) .. Seems like that Adafruit renamed Point function to TSPoint.. I'll try to modify something..

Anyway Thank you!

system · August 1, 2014, 9:00pm

Sorted it out... I left installed the Adafruit library, but "st7783" has it integrated... Conflicts all around :blush: Removed the Adafruit one and everything works like a charm..

casemod · August 1, 2014, 9:09pm

stez90: Sorted it out... I left installed the Adafruit library, but "st7783" has it integrated... Conflicts all around :blush: Removed the Adafruit one and everything works like a charm..

Great. So you basically had the same library installed twice most likelly with different versions. In the end which version have you used?

system · August 1, 2014, 9:21pm

The st7783. I removed all other libraries. All with 1.0.5 IDE. With 1.5.7 beta it gives

Arduino:1.5.7 (Windows 7), Scheda:"Arduino Duemilanove or Diecimila, ATmega328"

C:\Users\Stez\Documents\Arduino\libraries\st7783\glcdfont.c:9:23: error: variable 'font' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
 static unsigned char  font[] PROGMEM = {
                       ^

  Questo report potrebbe essere più ricco
di informazioni con
  "Mostra un output dettagliato durante la compilazione"
  abilitato in "File > Impostazioni"

Not a problem for me, since it works with 1.0.5 8) but i point it out if someone else has troubles.