2.4 tft lcd shield arduino made in china

I found that the one I have uses ILI9335 and after some hacking I was able to make it work with UTFT (it uses a non standard pinout using PB[0:1] and PD[2:7] and needs LCD_RD at HIGH) but so far so good.

I have seen this kind of shield almost everywhere the same pintout, red board, etc but I haven"t found any info to check if the logic is only 5V or any working example and of course the provided library only works for UNO boards.

Spice up your Arduino project with a beautiful touchscreen display shield with built in microSD card connection. This TFT display is 2.4" diagonal and colorful (18-bit 262,000 different shades)! 240x320 pixels with individual pixel control. As a bonus, this display has a optional capacitive touch panel and resistive touch panel with controller XPT2046 attached by default.

The shield is fully assembled, tested and ready to go. No wiring, no soldering! Simply plug it in and load up our library - you"ll have it running in under 10 minutes! Works best with any classic Arduino (UNO/Due/Mega 2560).

This display shield has a controller built into it with RAM buffering, so that almost no work is done by the microcontroller. You can connect more sensors, buttons and LEDs.

Of course, we wouldn"t just leave you with a datasheet and a "good luck!" - we"ve written a full open source graphics library at the bottom of this page that can draw pixels, lines, rectangles, circles and text. We also have a touch screen library that detects x,y and z (pressure) and example code to demonstrate all of it. The code is written for Arduino but can be easily ported to your favorite microcontroller!

If you"ve had a lot of Arduino DUEs go through your hands (or if you are just unlucky), chances are you’ve come across at least one that does not start-up properly.The symptom is simple: you power up the Arduino but it doesn’t appear to “boot”. Your code simply doesn"t start running.You might have noticed that resetting the board (by pressing the reset button) causes the board to start-up normally.The fix is simple,here is the solution.

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This module is a 2.4-inch TFT LCD module with “320X240” resolution and 65K color display. It is suitable for Arduino Uno and Mega2560 development boards, and also supports SD card expansion function. It uses 8-bit parallel port communication, and the driver IC is ILI9341.

The 2.4-inch display is a ready-made shield for Arduino Uno, which can also be placed on the Arduino Mega. The pins of this shield are designed to be easily installed on the Arduino. The bad point about these modules is that they use all Arduino Uno pins.

Open the downloaded file and upload the main.ino code on your Arduino Board. This code is for testing the display module and comes with full screen calibration.

Arduino has always helped to build projects easily and make them look more attractive.  Programming an LCD screen with touch screen option might sound as a complicated task, but the Arduino libraries and shields had made it really easy. In this project we will use a 2.4” Arduino TFT LCD screen to build our own Arduino Touch Screen calculator that could perform all basic calculations like Addition, Subtraction, Division and Multiplication.

Begin by carefully starting the rear connector of the TFT shield onto the Arduino uno. Go slowly and ensure that all pins are inserted correctly and are straight.

I changed the Adafruit libraries for TFT: GFX , TFTLCD and TouchScreen. I join all in this one library, the library SPFD5408, to avoid problems with duplicate libraries and enables also have the original library Adafruit ready for use in other projects with another TFT hardware.

Checking a TFT lcd driver is very messy thing especially if its a Chinese manufactured TFT. TFT’s that are supplied by Chinese manufactures are cheap and every body loves to purchase them since they are cheap,but people are unaware of the problems that comes in future when finding the datasheet or specs of the particular TFT they purchased. Chinese manufactures did not supply datasheet of TFT or its driver. The only thing they do is writes about the TFT driver their lcd’s are using on their websites. I also get in trouble when i started with TFT’s because i also purchased a cheap one from aliexpress.com. After so many trials i succeeded in identifying the driver and initializing it. Now i though to write a routine that can identify the driver.

I wrote a simple Arduino Sketch that can easily and correctly identify the TFT Lcd driver. I checked it on 2.4, 3.2 and 3.8 inch 8-bit TFT lcd and it is identifying the drivers correctly. The drivers which i successfully recognized are ILI9325, ILI9328, ILI9341, ILI9335, ST7783, ST7781 and ST7787. It can also recognize other drivers such as ML9863A, ML9480 and ML9445 but i don’t have tft’s that are using this drivers.

The basic idea behind reading the driver is reading the device ID. Since all the drivers have their ID’s present in their register no 0x00, so what i do is read this register and identify which driver tft is using. Reading the register is also a complex task, but i have gone through it many times and i am well aware of how to read register. A simple timing diagram from ST7781 driver explains all. I am using tft in 8-bit interface so i uploaded timing diagram of 8-bit parallel interface. The diagram below is taken from datasheet of ST7781 tft lcd driver.

The most complex tft i came across is from a Chinese manufacturer “mcufriend”. mcufriend website says that they use ILI9341 and ILI9325 drivers for their tft’s. But what i found is strange their tft’s are using ST7781 driver(Device ID=7783). This is really a mesh. I have their 2.4 inch tft which according to their website is using ILI9341 driver but i found ST7783 driver(Device ID=7783). The tft i have is shown below.

I am using Arduino uno to read driver. I inserted my lcd on arduino uno and read the driver. After reading driver i am printing its number on Serial Monitor.

Note:On serial monitor driver number will be displayed like if your lcd is using ST7783 controller than on serial monitor 7783 will be displayed or if tft is using ILI9341 than on 9341 will be displayed.

The code works on Arduino uno perfectly but if you are using any other board, than just change the pin numbers according to the board that you are using also check out for the Ports D and B. TFT Data Pin D0 is connected to Port-B Pin#0 and D1 is connected to Port-B Pin#1. TFT Data Pins D2 to D7 are connected to Port-D Pins 2,3,4,5,6,7. So if you are using Arduino mega than check for the Ports D and B and Make connections according to them. Arduino mega is working on ATmega2560 or ATmega1280 Microcontroller and Arduino uno is working on ATmega328p Microcontroller so both platforms have ports on different locations on arduino board so first check them and then make connections. The same process applies to all Arduino boards.

These Chinese Arduino Uno TFT LCD shields are neat and very cheap, so I couldn"t resist and got one from Banggood. As with nearly everything Chinese, there are several versions and revisions around and it"s usually surprise which one you will recieve. It seems my shield came with ILI9341 controller although there is written ILI9340 on the board (I didn"t disassemble it, but I assume it according to the shield behaviour). I tried to get it working with Adafruit TFTLCD-Library, but it ended with "Unknown LCD driver chip: C0C0" and white screen. So I dug a bit deep into this problem. It quickly turned out that the chip needs a bit longer delay for reset to start responding. For my shield it seems that additional 5 milliseconds are enough. Then it correctly identified itself as ILI9341. But it still didn"t display anything, there was only the whitescreen.

I read both ILI9340 and ILI9341 datasheets and found out that my chip has extended registers which are not handled by the original code. I verified content of these registers with the datasheet and it revealed that the "Pump ratio control" register is set to 0x0 after the reset. According to the datasheet this is "reserved" value and after the reset the content of this register should be set to 0x20 (which means 2xVCI). Maybe my chip revision is newer than my datasheet or maybe this is some HW glitch but this again validated the basic rule known to embedded developers: "never ever rely on the default values after the reset". So I added initialization for the extended registers. I also improved chip select (CS) handling in the code which allows sharing of the data ports with other peripherals. I did some other minor improvements and bug fixes to the code. All of the changes should be harmless to older HW. Even the initialization of the extended registers should work on chips without extended registers, because according to the datasheet, such initialization should be handled as NOP commands. I pull requested the changes to Adafruit, there is the direct link to the related commit. It seems the shield has different orientation of the display than the Adafruit library expects, thus you need to uncomment #define ILI9341_MIRROR_X 1 and comment #define ILI9341_MIRROR_Y 1 in Adafruit_TFTLCD.h to fix the orientation.

Regarding the touchscreen it"s classic 4 wire resistive digitizer which can be handled by e.g. Adafruit TouchScreen library. The only thing that you need to setup is which pins the touchscreen is connected to. Unfortunately it is not written on the kit, but it"s possible to locate the connections visually and with the multimeter. The wiring of my shield is following:A1Y+

Unfortunately my shield came with broken electrode, so my touchscreen didn"t work, but I checked the correct functionality of the code on my friend"s shield. I was refunded by Banggood without problems, so I ordered another shield and will keep this broken shield for projects that do not require touchscreen. You can see the detail of the broken electrode here:

I downloaded the code for this simple painting application somewhere on the internet and modified it to work with my shield. The modified code is available for download. There was no licensing information in the original code, so hopefully the license status of this code is OK (free/public domain). If not, please let me know. In the application you can draw by your stylus/finger, select colors on the side and clear the display by tapping on the opposite display side.

Sometimes we need to show special word or symbol in the LCD monitor, and we will spend more time to design or create it. If we have an easy and rapid editable program to help us, it"s very good.

In the Excel file, you just only put your 40*40 word in prototype area, and then press button on the top of left. You will get a series of encode values on the most right table, then you copy them into Arduino make_word.ino file to decode, Things done.