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Topic: ANOTHER Sainsmart 3.2" TFT Screen topic.. (Read 5908 times) previous topic - next topic

dosftw


The noise you are getting is quite common when you are feeding the 3.3v TFT controller with 5v signals....

There is actaully a reason why there are resistors or level translating ICs on the adapter shields.

/Henning


Even if I run the LED-A through a resistor it is still the same though.

Anything I can do to prevent it without having to use a cumbersome shield that prevents access to the unused pins?

Also on another note, I have a load of 74HC595 Shift Registers, is there any way to use these to reduce the number of pins that the screen requires?

Nathan

The LED-A is supposed to get 5v. It is only used for the backlight.
The problem is all of the signal pins. They are rated for a maximum input of Vddio which in the case of the SSD1289 is maximum 3.6v (typically 3.3v).

You don't have to use a shield, but there is a possibility of killing your screen if you don't lower the signal voltage. This can normally be done by running a 10k ohm resistor in series with each signal (applies to the display, touch screen and the SD card).

It is possible to use 74HC595s to reduce the pin count, but you will have to rewrite the I/O part of the library, and the data transfer rate will be much slower.

/Henning

dosftw

Hey everyone, I just thought I would make good on my promise to post a video of my screen working.

http://www.youtube.com/watch?v=uZ9KQP9VzYg

Here I have the SD demo uploaded into my Arduino showing a selection of .RAW images.

Unfortunately.. for some reason the screen is very blue :S is has been like that since I got it working.

I have also replaced the jumpers with nice and neatly arranged and tidy Male to Female cables that came in the post today :) If you live in the UK and you buy a lot of stuff on eBay then 4tronix_uk are a fantastic eSeller. Extremely helpful, courteous and efficient. I hope its ok to say that on the boards, if not let me know and I will remove it from my post .

Nathan

dosftw

Does anyone think they know why the display is extremely blue?

Nathan

PeteA

Which SD card are you using are how have you wired in the sd slot?

Im having trouble getting mine to work!  :~

cooldex

Hey everyone, I just thought I would make good on my promise to post a video of my screen working.

http://www.youtube.com/watch?v=uZ9KQP9VzYg

Here I have the SD demo uploaded into my Arduino showing a selection of .RAW images.

Unfortunately.. for some reason the screen is very blue :S is has been like that since I got it working.

I have also replaced the jumpers with nice and neatly arranged and tidy Male to Female cables that came in the post today :) If you live in the UK and you buy a lot of stuff on eBay then 4tronix_uk are a fantastic eSeller. Extremely helpful, courteous and efficient. I hope its ok to say that on the boards, if not let me know and I will remove it from my post .

Nathan
Hi Nathan
Can you post the wiring diagram for the Mega and 3.2 LCD please.

avr_fred

Hi Nathan
Can you post the wiring diagram for the Mega and 3.2 LCD please.
Glomming onto an almost two year old post with a question is sure-fire way to be ignored. Dosftw has not made another post on this board since the one above so I seriously doubt he is just waiting on his computer to answer your question.

Why don't you read the sticky post at the top of this section on how to use the forum and start a new thread with your question that contains some detail on the problem you're trying to solve?

ghlawrence2000

Can you post the wiring diagram for the Mega and 3.2 LCD please.
Yes, here :- Mega wiring ;):p

Much more reliable, and almost guaranteed to work!

avr_fred hi, it seems not only has he resurrected this thread, but another old one in the DUE board too, not sure if he knows what he needs, but I posted a link to Henning's libraries on the other thread. UTFT Libraries and code.



Regards,

Graham

cooldex

Yes, here :- Mega wiring ;):p

Much more reliable, and almost guaranteed to work!

avr_fred hi, it seems not only has he resurrected this thread, but another old one in the DUE board too, not sure if he knows what he needs, but I posted a link to Henning's libraries on the other thread. UTFT Libraries and code.



Regards,

Graham
Thanks Graham, appreciate your help.

Syronaut

Hi there,

I do have Problems with this display too.

If it is possible ( without any shift registers ) I would like to use the display on an Arduino NANO in a serial mode ... I know it will be very slow but thats ok.

I want to use a library that can do so, not want to write it myself ...


If it is NOT possible to drive the display serial I would like to use it in 8 bit mode ... as less pins as possible

please help me, I'm looking for a lib, pinout and examples

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