ANOTHER Sainsmart 3.2" TFT Screen topic..

I apologise for the double post but here is a video as promised.

For some reason the screen has developed a screen flickering.. Does anyone else have this problem with the LCD? Or does anyone know how to solve the problem?

Below is the youtube link to the video.

The touch screen is not yet working and neither is the SD slot. For now I am happy to get all the kinks out of the LCD display.

Kindest regards,

Nathan

I was just tinkering with my new sainsmart 3.2, and I got it work fairly well these librarys. Mind you I'm using the lcd shield from sainsmart too, cause I didnt want to do all the ridiculous wiring
Electronics - Henning Karlsen for touch
Electronics - Henning Karlsen for display

dosftw:
I apologise for the double post but here is a video as promised.

For some reason the screen has developed a screen flickering.. Does anyone else have this problem with the LCD? Or does anyone know how to solve the problem?

Below is the youtube link to the video.

Sainsmart 3.2" TFT LCD Problems - YouTube

The touch screen is not yet working and neither is the SD slot. For now I am happy to get all the kinks out of the LCD display.

Kindest regards,

Nathan

At least that doesn't look like a dodgy display, check your connections and make sure the RD pin is pulled high, as floating values will cause stuff similar to that.

Once again excuse the n00bie-ness but what do you mean by RD is pulled High?

Obviously I know what you mean by RD as you are referring to the Pin that is going to the 3.3v point on the Arduino.

Best regards,

Nathan

PS. Having just read another topic on the same TFT screen, I think the most appropriate work for describing what is happening on screen is it becomes extremely 'noisy'.

Nathan

Yeah its noisy alright.

If the RD pin is connected to 3.3v, then it is fine. The odd occasion I have had noise on my screen, was due to a loose wire.

When the screen is running and goes noisy, gently press the wires in ( if not soldered ) and see if the noise goes away or changes with your touch.

pYro_65:
Yeah its noisy alright.

If the RD pin is connected to 3.3v, then it is fine. The odd occasion I have had noise on my screen, was due to a loose wire.

When the screen is running and goes noisy, gently press the wires in ( if not soldered ) and see if the noise goes away or changes with your touch.

Hmm that is strange as my RD pin is connected to 3.3v..

I have ordered some more Male to Female jumper leads with the square housing.. So hopefully if there ARE any loose connections due to the circular jump leads then they will be fixed by the new square ones.

I will keep you all updated and hopefully once I get the new Male to Female leads i will be able to use the touch screen and SD slot too.

Nathan

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

doc_norway:
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

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

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 :slight_smile: 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

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

Nathan

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

Im having trouble getting mine to work! :~

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

Sainsmart 3.2" TFT LDC running SD Demo - YouTube

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 :slight_smile: 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.

cooldex:
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?

cooldex:
Can you post the wiring diagram for the Mega and 3.2 LCD please.

Yes, here :- Mega wiring ;):stuck_out_tongue:

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

ghlawrence2000:
Yes, here :- Mega wiring ;):stuck_out_tongue:

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.

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

dosftw:
Excuse my newbieness but how on gods green earth am I meant to be able to read that haha!! :stuck_out_tongue:

Made me laugh ! :stuck_out_tongue_winking_eye: I was thinking the same thing !
Trying to work the screen witthout the shield