tft display arduino with sd-card manufacturer

I am a beginner regarding arduino in general so I might be not seeing something pretty obvious. There seems to be some communication problem when talking to both devices.

I followed a number of different tutorials (e.g. this one https://mytectutor.com/micro-sd-card-module-with-arduino-and-tft-display/ ) but they are either using a ST7735 display which has an additional CS pin which my display does not have (could this be the problem?) or they don"t use an SD module.

I am wondering which 1.8" TFT you are using. I bought a red DS Tech 1.8" TFT screen with a yellow, 11-pin header on one side and I soldered on a 4-pin header on the other side. I had to do some research, from which I gathered the following...

...in order for both the screen and the card reader to work, hardware SPI must be used. In the code at the top of this page, you have RST on pin 9 and DC on pin 8, but the Arduino TFT documentation has RST as 8 and DC as 9.

I was able to get the screen to work (although it is annoyingly intermittent -- one moment it will read a BMP file just fine, and the next it says that same file is not found -- and any help with this would be greatly appreciated).

C:\Program Files (x86)\Arduino\libraries\TFT\src/utility/Adafruit_GFX.h:318:40: warning: converting to non-pointer type "int" from NULL [-Wconversion-null]

Anyway now I commented that line, beacuse I am not interested in speed right now. But now the problem seems to be the programation code. the error message is as follows: ( I am using Arduino 1.8.7)

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:101:37: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:106:42: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:118:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:121:42: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:151:40: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:163:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:176:37: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:183:38: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:188:38: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:193:38: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:198:38: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:205:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:210:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:215:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:220:39: warning: ISO C++ forbids converting a string constant to "char*" [-Wwrite-strings]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino: In function "void drawBMP(char*, int, int, boolean)":

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:267:40: warning: converting to non-pointer type "int" from NULL [-Wconversion-null]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino: In function "void drawRAW(char*, int16_t, int16_t, int16_t, int16_t)":

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2\ILI9341_draw_bitmap_v2.ino:377:40: warning: converting to non-pointer type "int" from NULL [-Wconversion-null]

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2/ILI9341_draw_bitmap_v2.ino:355: undefined reference to `FatFile::close()"

C:\Users\ADMIRAL\Videos\arduino\Libraries\Adafruit_ILI9341_AS\examples\ILI9341_draw_bitmap_v2/ILI9341_draw_bitmap_v2.ino:338: undefined reference to `FatFile::read(void*, unsigned int)"

In this guide we’re going to show you how you can use the 1.8 TFT display with the Arduino. You’ll learn how to wire the display, write text, draw shapes and display images on the screen.

The 1.8 TFT is a colorful display with 128 x 160 color pixels. The display can load images from an SD card – it has an SD card slot at the back. The following figure shows the screen front and back view.

This module uses SPI communication – see the wiring below . To control the display we’ll use the TFT library, which is already included with Arduino IDE 1.0.5 and later.

The TFT display communicates with the Arduino via SPI communication, so you need to include the SPI library on your code. We also use the TFT library to write and draw on the display.

In which “Hello, World!” is the text you want to display and the (x, y) coordinate is the location where you want to start display text on the screen.

The 1.8 TFT display can load images from the SD card. To read from the SD card you use the SD library, already included in the Arduino IDE software. Follow the next steps to display an image on the display:

Note: some people find issues with this display when trying to read from the SD card. We don’t know why that happens. In fact, we tested a couple of times and it worked well, and then, when we were about to record to show you the final result, the display didn’t recognized the SD card anymore – we’re not sure if it’s a problem with the SD card holder that doesn’t establish a proper connection with the SD card. However, we are sure these instructions work, because we’ve tested them.

In this guide we’ve shown you how to use the 1.8 TFT display with the Arduino: display text, draw shapes and display images. You can easily add a nice visual interface to your projects using this display.

This ST7735S 1.8" TFT Display features a resolution of 128×160 and SPI (4-wire) communication. Integrated with an SD card slot, it allows you to easily read full-color bitmaps from the SD card.

The module provides users with two wiring methods: pin header wiring and GDI (General Display interface). You can directly connect the display to a FireBeetle main controller using an FPC cable. Plug and play, easy to wire. Besides, the display supports a low refresh rate and offers a good display effect and strong versatility.

This 2.0” LCD display adopts ST7789V driver chip and has 320*240 color pixels (RGB565), performing excellently in the angle of view (80/80/80/80). It supports SPI(4-wire) communication mode and GDI port (work with main-controllers with GDI), plug, and play. The module can be powered by 3.3V~5V, compatible with multiple main-controllers like Arduino UNO, Leonardo, ESP32, ESP8266, FireBeetle M0, and so on. Use the GDI interface to work with M0, which could effectively reduce wiring steps. Besides, there is an onboard MicroSD card slot for displaying more pictures.

The module has the advantages of high resolution, wide viewing angle, and simple wiring, and can be used in many display applications: waveform monitor display, electronic gift box, electronic weather decorations, etc.

Note: The following picture is the connection diagram of the 2.8-inch TFT screen and Arduino uno, but this product is connected in exactly the same way.

If the Arduino board has an ICSP interface, set the SPI Config switch on the display module to the ICSP direction (by default) (the company"s Arduino UNO motherboard has an ICSP interface, just plug it in directly.).

This product uses the same LCD control chip and touch panel control chip as the 3.5-inch TFT screen of the same series of our company, so the code is completely compatible. The following takes 3.5-inch TFT as an example to introduce.

LCD_Show can display colorful patterns with different shapes and times. LCD_ShowBMP is for displaying the picture in BMP, and LCD_Touch is for using the touching function.

The display controller used in this product is ILI9486, and we need to initialize the controller through the SPI communication protocol, and the initialization functions are written in LCD_Driver.cpp.

The function functions related to the screen display are written in LCD_GUI.cpp. The function of each function and the parameters passed are explained in the source code. You can call it directly when you need to use it.

Before using LCD_ShowBMP to display pictures, first copy the pictures in the PIC folder in the data to the root directory of the SD card (you should understand that in the root directory, that is to save the pictures directly to the SD card, do not put them in any subfolders folder.).

Here is an explanation. This demo shows that the BMP picture first reads the picture data in the BMP format in the SD card through the SPI protocol, and then displays the data as an image.

These functions are all written in LCD_Bmp.cpp. In fact, the image data in BMP format with a specific file name is read from the SD card, and then the display function written by us is called to re-express the data as an image.

After running this demo, there are five colors on the right side of the screen. Black is the default color in the system, and you can touch it to choose the brush color. Click AD button, and click the red "+" to calibrate the screen with the prompts. Click the right corner "CLEAR" to clear the drawing board.

In fact, you can also use Image2Lcd image modulo software to convert images of different sizes and formats into array data, and then use the functions we wrote to display them.

Note: The following picture is the connection diagram of the 2.8-inch TFT screen and XNUCLEO-F103RB, but this product is connected in exactly the same way.

This product uses the same LCD control chip and touch panel control chip as the 3.5-inch TFT screen of the same series of our company, so the code is completely compatible. The following takes 3.5-inch TFT as an example to introduce.

After running the demo, it displays some characters and patterns at first, then displays four pictures, and finally displays the touch sketchpad function. Actually, three projects in the Arduino platform code are integrated in the main function, we place the three main functions in sequence and place TP_DrawBoard(); in an infinite loop to achieve the above functions.

Before using LCD_ShowBMP to display pictures, copy the pictures in the PIC folder in the data to the root directory of the SD card, and then insert the SD card into the SD card slot on the back of the screen to start the download program verification.

It should be noted here that the SD card should be in the FAT format, and the picture should be 480*320 pixels with 24-bit color depth and BMP format.

In fact, you can also use Image2Lcd image modulo software to convert images of different sizes and formats into array data, and then use the functions we wrote to display them.

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.

The above code works fine, the "Welcome" message is displayed on the screen, followed by the display of the "2.bmp" image as expected. The serial output prints:

Can you please tell me what could be wrong here ? I suspect the root = SD.open("/"); somehow affects the TFTscreen.loadImage(imageName); but I have no idea how.

This is a 3.5-inch 320 * 480 resolution TFT colour screen. It supports working boards such as Arduino Uno and Arduino mega2560 and Arduino due. Also supports STM32, 51 and other conventional microcontrollers.

When using this screen, you do not need any wiring operations, just plug onto your Arduino board, we will provide the corresponding Arduino library files, the development code is open source, you can use Arduino and this screen to build some awesome applications and games!