TFT 3'2 problems

Other Hardware Displays
1

hi,
i got this tft: http://www.ebay.com/itm/261096794843?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648

Im not using shield, i connect direct to arduino mega. Im using UTFT library; UTFT myGLCD(ITDB32S,38,39,40,41);

And i use this connections:
(http://www.geeetech.com/wiki/index.php/3.2TFT_LCD)
LEDA -> 5V
VCC -> 5V
RD -> 3.3V
GND -> GND
DB0->DB7 to pin D37->D30
DB8->DB15 to pin D22->D29
RS -> D38
WR -> D39
CS(pin6) -> D40
RSET-> D41

I have this problem: i upload the demo (320x240), all looks ok, but after 35 or 40 seconds, the screen go white. If i reset arduino, still white..
the only i can do is disconnect arduino from usb and wait like 1 min or more. Then if i connect i can see the demo again for 35-40s....

What im doing wrong????

thanks

2

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3

This is only a guess as I haven't read any data sheets etc but....

The geeetech site includes in the Specifications:

5V Operating Voltage

However, the ebay site specifically states:

Working voltage is 3.3V

How have you connected the LCD to the Arduino? Most of these LCD's require some form of level shifting to convert the 5v to 3.3v - which is why most people use a shield to go between the LCD and the Arduino.

Maybe your LCD has some form of over voltage protection and it is shutting down after a period of time?

4

That LCD WILL NOT WORK @ 5V... Get a shield to interace it.. If you continue attempting to wire it directly you may well damage the part..

Doc

5

Hello, tanks for your replys.

Im connecting to 3.3v arduino output,,, but the TFT still going to white screen after 30-35s.. Maybe is already damaged?

6

hello, after connect VCC and RD to 3.3v of arduino and LED-A to 5v, i get the same ---> the demo work, but after 30-35s the scren go white.

Then i bought a new one tft... now the screen dont go white, but i get this white lines when the demo moves:

2048×1536 559 KB

2048×1536 579 KB

What im doing wrong? i really need to solve this :frowning:

7

Buy a shield to interface between the LCD and the Arduino.....

8

is not posible to connect without shield? im forced to buy one ????

9

franlol:
is not posible to connect without shield? im forced to buy one ????

No you are not forced to buy one, it's just that you will have a lot more work in front of you if you don't.

Connecting the VCC to 3.3v from the Arduino is not solving your problems - you also need to adjust all of your data pins etc from 5v to 3.3v.

The site that you purchased the LCD from also sells the shields - something like this is what you need http://www.ebay.com/itm/1pcs-3-2-TFT-LCD-Shield-Touch-Panel-Arduino-/121303991432?pt=LH_DefaultDomain_0&hash=item1c3e480488#ht_4649wt_934. Not sure if this is exactly what you need - you will need to do your own investigations as I don't know exactly what hardware you are using.

You will note that the shield has a number of IC's on board - if you don't want to buy a shield (and they are not really that expensive) then you will need to replicate those components. You may get away with using resistors although that is not the recommended solution.

Cheers

10

cheers, and thanks for your replys.

I think i have a voltage problems. Trying something, i connected Led-a, Rd, and Vcc to 5v, and i connected a external 4.5v signal to 3.3v pin of arduino mega. Is working 100% with 0 'trash' in the screen.....

what do you think? :S

11

franlol:
what do you think? :S

From my perspective, I have no more answers to give :roll_eyes:

Maybe others will be able to say something that you want to hear....

However, randomly connecting various voltages to various pins is , more likely than not, going to result in you destroying the Arduino, the LCD, or both.

Cheers