3.5 tft lcd shield ili9481 brands

Displays are one of the best ways to provide feedback to users of a particular device or project and often the bigger the display, the better. For today’s tutorial, we will look on how to use the relatively big, low cost, ILI9481 based, 3.5″ Color TFT display with Arduino.

This 3.5″ color TFT display as mentioned above, is based on the ILI9481 TFT display driver. The module offers a resolution of 480×320 pixels and comes with an SD card slot through which an SD card loaded with graphics and UI can be attached to the display. The module is also pre-soldered with pins for easy mount (like a shield) on either of the Arduino Mega and Uno, which is nice since there are not many big TFT displays that work with the Arduino Uno.

One of the good things about this module is the ease with which it can be connected to either of the Arduino Mega or Uno. For this tutorial, we will use the Arduino Uno, since the module comes as a shield with pins soldered to match the Uno’s pinout. All we need to do is snap it onto the top of the Arduino Uno as shown in the image below, thus no wiring required.

To easily write code to use this display, we will use the GFX and TFT LCD libraries from “Adafruit” which can be downloaded here. With the library installed we can easily navigate through the examples that come with it and upload them to our setup to see the display in action. By studying these examples, one could easily learn how to use this display. However, I have compiled some of the most important functions for the display of text and graphics into an Arduino sketch for the sake of this tutorial. The complete sketch is attached in a zip file under the download section of this tutorial.

As usual, we will do a quick run through of the code and we start by including the libraries which we will use for the project, in this case, the Adafruit GFX and TFT LCD libraries.

With this done, the Void Setup() function is next. We start the function by issuing atft.reset() command to reset the LCD to default configurations. Next, we specify the type of the LCD we are using via the LCD.begin function and set the rotation of the TFT as desired. We proceed to fill the screen with different colors and display different kind of text using diverse color (via the tft.SetTextColor() function) and font size (via the tft.setTextSize() function).

This 3.5 inch TFT LCD Module can be can be easy controlled by MCU such as 8051, PIC, AVR, ARDUINO, and ARM .It can be used in any embedded systems which require display high quality colorful image. Please see the sample pictures, they are taken directly from the LCD display. The Module include a 5V>3.3V regulator, touchpad IC, PWM circuit and SD card slot.

This 3.5 inch TFT LCD Module is not an ordinary 3.5 inch Module, this module has a high resolution of 480x320, Ordinary 3.2 inch has only 320x240 resolution. This module has an double resolution and extremely fine dot pitch (0.139mmx0.139mm). It also include a touchpad and 12bit onboard touchpad controller. This LCD module is suitable for user require high resolution, brilliant display quality.

The TFT LCD Module has embedded Flash IC, which contain fonts of 10 sizes and 236 icons. The LCD module support Henning Karlsen"s UTFT library, which can be downloaded here.

This 3.5" TFT LCD Module has a high resolution of 400x240. This module has an double resolution and extremely fine dot pitch. It also include a touchpad and 12bit onboard touchpad controller.  This LCD module is suitable for user require high resolution, brilliant display quality.

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It appears to me that there is no backlight control, either through software or hardware. Neither is there a comprehensive schematic for either the screen part or for the circuit board. The controller chip, the ILI9481 does, however, appear to be well documented.

The display is based on the popular ILI9481 chipset and works with 5V so it can be used with all Arduino compatible boards. Just plugin and start coding.

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This display can be mounted on an Arduino Mega or Due. It has a fairly high resolution of 320*480 pixels and is also quite large with 3.2 inch LCD size.

I bought four MCU Friend 3.5″ TFT shields.  And, unfortunately, they have spiraled me into a deep, dark place trying to figure out how to use them.  The the documentation consists of a sticker on the antistatic bag, a picture of the shield with a list of 5 different possible LCD drivers, a pinout, and a block of code that supposedly represents the startup code.  The unfortunate part is that none of these have been exactly right – they all have errors.  This article is a description of the journey to figuring out how to use them.

It also has a picture which says the LCD has one of several different controllers (and after digging in I know for a fact that two of mine were made by Raydium and are not on the list)

And finally a table of pins.  Which is interesting as it lists 37 pins when the shield has no where near that number.  And it shows the shield as  16-bit interface which it isnt … and it shows some LEDs which aren’t there either.

I bought 4 different shields.  One came broken.  The other three are all different.  When you look at the boards there are two visibly different configurations

Next, I started down the path of trying to figure out what the controllers were by using register reads.  David Prentice (the guy who wrote/maintains the MCU Friend_kbv Arduino library) has an absolute ton of responses on the Arduino forum trying to help people figure out what their shield is.  He asks them to post the register report from his example program LCD_ID_readnew which is included as an example in the library.

When you look at these LCD controllers they all have some variant of “Read ID” which responds with 1-6 bytes.  The basic idea of this program is to look at what bytes are returned to try to identify the controller.  Here is an example of what I got when I ran the LCD_ID_readnew program on my shields:

The key thing to see in this output is the register 0x04 which says 54,80,66 which identifies this as a Raydium RM68140 LCD controller.  Here is a snapshot from the data sheet.

After digging some more, I decided that it is super ugly out there, as you find that there are a significant number of LCD controllers that are clones, copies, pirated etc… and that they all present themselves differently.  And, in hindsight I think that this is the reason that my ILI9341 from the previous article doesnt quite work correctly.

At this point I have spent a frightening amount of time figuring out how these screens work.  Although it has been a good learning experience, I have generally decided that using unknown displays from China with LCD drivers of questionable origin is not worth the pain of trying to sort out the interface.  Beyond that:

This 3.5 inch TFT LCD is based on the ILI9481 LCD driver and gives a very sharp/nice picture quality and works amazing well with Arduino Uno and Arduino Mega Microcontrollers. Unfortunately this display is not a touchscreen display, however it makes it up with the included MicroSD Card Slot. No soldering, no wiring, no fuss just plug and play!

If using the UTFT library from RinkyDink electronics, open up their initlcd.h file. In the section for Memory Access Control (lines 85-86 in version I have), change the write to: