I ordered the display from eBay in this Link.
And I received the display in pictures 1-3.
I connected the display as pictur 4, with nano.
The connections as recommended in the example graphicstest.ino, Figure 5.
I used all the possible libraries I found on Google, according to Figure 6.
Still unable to display anything on the screen.
Does anyone have any idea how to solve the problem?
Thanks a lot.
Despite the description stating it handles 5v logic I see no level translator so I think the advert is wrong (this is often the case).
You will need logic level converters, one cheap method is to use resistors. as mentioned in the instructable:
Stick with the library you have and get the display going before you try others.
Thanks,
I'll read and check, and write results.
I read what's in the link.
Write add resistors, add resistors and it does not solve the problem.
The description of the item indicates that the display works in two voltages, including IO ports, 3.3 and 5 V.
I still have not found a solution.
Go on. I have replied to many of your questions.
Both Bodmer and I have advised using 3.3V logic.
We have pointed to libraries, tutorials, examples, wiring diagrams, ...
You are not alone. Many people are obsessed with using 5V logic regardless of advice to use level shifters. They all end up with 3.3V and success. Or remain stubborn and fail.
Adafruit examples omit the RST argument in the constructor. Add the RST argument and everything will work.
If you are too stubborn to use the correct constructor, you must add a 3.3V pullup on the RST line.
David.
Thanks a lot David and Bodmer, but,
I tried all the possibilities that are offered in all the links.
The RST and all 5 connections, I hooked up to 3.3 and 5V, with a resistors of 1.2 kHom and without.
The description of the item says that it is possible to connect 5 or 3.3 volts, which did not help.
I begin to fear that I have knocked the display.
I ordered this Level converters,
And I hope that these will help, I wait and see.
CD4050BE it's the best choice
You need at least 6 channels for shifting SCK, MOSI, TFT_RST, TFT_CS, SD_CS, T_CS if you want to use TFT, SD, XPT2046.
MISO will be at 3,3V levels anyway. I would use a small series resistor in the MISO line and T_IRQ line.
The CD4050 has got 6 channels in one chip. Other buffer chips are available.
Your Ebay link does not look suitable for level shifting SPI signals but it might be ok.
Seriously, many people have used 5V Arduinos and SPI ILI9341 with appropriate level shifting.
Life is simpler with Zero, Due, ..., ESP8266, ESP32, ...
David.
First of all thank you for your response.
I have ESP8266 NodMCU,
If I connect to it, the display will work?
If so, Which pin is recommended to connect?
Go on. Look at Bodmer's TFT_ESP library. Look at his advice.
I am guessing that English is not your first language. This is an English language Forum.
If you reveal your country and language, people might try to write replies that are easier for "Google Translate" to understand.
David.
You're right, English is not my language, and I do a translation from Google.
I'll check your offer.
Thanks for everything.
Ah-ha. I thought that my location was already in my Profile. I have just edited my Profile.
Not everyone wants to make their personal information public. I see no problem with saying which country. You might not want to say which town.
Knowing a member's location means that replies can be appropriate. For example, I might invite someone for a beer if they live near me.
David.
david_prentice:
You need at least 6 channels for shifting SCK, MOSI, TFT_RST, TFT_CS, SD_CS, T_CS if you want to use TFT, SD, XPT2046.
why SD_CS ? it has nothing to do with the ILI9431 ship itself
TFTLCDCyg:
CD4050BE it's the best choice
these are hex buffers, I doubt they work when reading a line from the display like MISO and T_IRQ
I use yf04e and yf08e..(they are billateral)
I could achieve to make the display work, but it's rather intermitent althought I added 100nF VA and VB around the chip
MosheB:
I ordered this Level converters,5pcs IIC I2C Level Conversion Module 5-3v System For Arduino Sensor | eBay
And I hope that these will help, I wait and see.
if you only want to send data to the screen , a simple resistors divider would do to conver 5v to 3v 
you only need fancy converters for read outs
There seems little point in buying a display with SD cage and Touch controller if you don't use them.
And I suggested the lines that need shifting from 5V to 3.3V. Six channels in a Hex buffer chip.
MISO and T_IRQ are 3.3V signals. A 5V AVR will be able to read 3.3V ok.
Yes, you could shift these two signals from 3.3V to 5V if you want. Needing another two level shifters.
I purchased some bidirectional shifters a while ago. I have never tried them. Do they work ok with a high speed SPI bus? It seems a lot easier to stick with 3.3V GPIO like ARM or ESP.
You can use resistor dividers for 5V to 3.3V. There is no need for anything on MISO but a 2k2 series resistor will not upset the read and act as safety if someone sets MISO as OUTPUT by mistake.
David.
David,
If it matters so much where I am from, then I'm from Israel and I speak Hebrew, and a little English.
phil123456,
I will try every recommendation, and if you have to offer what to try, I will.
I also ordered the element suggested by David.
So I'm willing to try everything.
what do you call high speed ?
apparently these chips can go from from 2Mbps to 24Mbps, I have no idea on what condition
while the adafruit lib sets the spi to SPI_CLOCK_DIV2 => 8Mhz on a arduino mega
actually I've seen the adafruit demo working fine on several occasions, but I can never achieve any stability
I suspected the reset pin on the display not beeing initialized properly, also I noticed the screen had to be powered with 5 volds(having his own 3v regulator)
I noticed ripple on the data lines of yf04e/yf08e I use, so I ordered some smd capacitors to solder them as close as possible, and a 10k pull down resistor so their OE pin is low on start, but I am not sure if it will help
I guess I'll do it with simple voltage divider, but I foudn the ic beeing a more elegant way, and damned I payed for these
OK,
I tried the connection to ESP, and did not help either.
I tried with the library TFT_ILI9341_ESP , and with the new library TFT_eSPI,
I have connected as recommend in file User_Setup.h
And I also changed the RST according to the recommend and did not solve the problem.
I'm really desperate, and it seems to me that the display was screwed up.
If your display is not working with TFT_eSPI library examples, I suspect you have damaged it.
Buy another display.
Your TSX0108E buffers should be plenty fast enough for a Mega2560. And your wiring looks correct.
The 3.3V MISO signal is driven push-pull by TFT, SD or XPT2046. The TSX0108E is high speed.
The 3.3V T_IRQ signal is open-drain (as I remember). Speed is not critical.
I would really like to see your Adafruit_ILI9341 constructor. The Adafruit examples omit the RST argument.
I am fairly certain that I have one of these chips. I might make a 5V adapter shield if I am feeling keen.
I have never seen the need for 5V GPIO. I possess a Mega2560 but only used it with 5V compatible shields.
David.
