ra8875 tft display free sample

Are you sure you connect everything fine, settings are ok, you are using the correct CS pin, you don"t have any other SPI devices sharing the same line, the display has correct jumper set and you are sure that display it"s correct supplied (and the supply it"s stable, check also this!) but you still have nothing on screen?

This is the first attemp to create a library that use all the features of this chip from scratch and have nothing to share with the Adafruit_RA8875 library.

This library will work also with the Adafruit board but was mainly coded for the many TFT displays from china makers that use this chip, some are quite good and cheap, like the EastRising from buydisplay.com, much cheaper than adafruit.

Current beta has a optional Teensy instance that can use alternative SPI pinouts, this let you use Audio Board from PJRC that uses the classic SPI pinouts for RX and SD cs. You can test it with Spectrum Analyzer example that uses the Audio Board with a RA8875 TFT screen and thanks to the hardware accelleration of this chip and the use of onchip screen buffer it let you have large screen with touch capabilities with high-end audio manipulation.

Spice up your Arduino project with a beautiful large touchscreen display shield with built in microSD card connection. This TFT display is big (7" diagonal) bright (14 white-LED backlight) and colorfu 800x480 pixels with individual pixel control. As a bonus, this display has a optional capacitive and resistive touch panel attached on screen by default.

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.

For 7 inch screen,the high current is needed.But the current of arduino uno or arduino mega board is low, an external 5V power supply is needed. Refer to the image shows the external power supply position on shield ER-AS-RA8875.

Spice up your Arduino project with a beautiful large touchscreen display shield with built in microSD card connection. This TFT display is big (9" diagonal) bright (30 white-LED backlight) and colorfu 800x480 pixels with individual pixel control. As a bonus, this display has a optional capacitive and resistive touch panel attached on screen by default.

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.

For 9 inch screen,the high current is needed.But the current of arduino uno or arduino mega board is low, an external 5V power supply is needed. Refer to the image shows the external power supply position on shield ER-AS-RA8875.

Yesterday I got the shipment for my RA8875 driver and the 5.0" TFT display. I did some readings before the arrival of the driver and display and used the example programs in the libraries for some initial help. The TFT does not seem to be working for some reason. I did some troubleshooting by haveing some initialization commands in the Serial Monitor which stated the screen has been enabled and the RA8875 was detected.

FocusLCDs.com sent me a free sample of a 4x3” TFT LCD (P/N: E43RG34827LW2M300-R) to try out. This is a color active matrix TFT (Thin Film Transistor) LCD (liquid crystal display) that uses amorphous silicon TFT as a switching device. This model is composed of a Transmissive type TFT-LCD Panel, driver circuit, backlight unit. The resolution of a 4.3” TFT-LCD contains 480x272 pixels, and can display up to 16.7M colors.

For this project, you would need the RA8875 driver board (available at AdaFruit for US$35) to interface the TFT display to the Arduino. It comes with a header which you can solder on as needed.

I am programming a 5 inch display bought in buydisplay (https://www.buydisplay.com/5-inch-tft-lcd-module-800x480-display-controller-i2c-serial-spi) which has a RA8875 chip and a capacitive touch panel (both use the I2C protocol), and even though I have been able to write text for example, I am struggling trying to implement the code for the touch part, and looking the datasheet I am not able to see what I am doing wrong.

I know or think so which registers I have to write to or read from, but what I don"t t know is the chip I have to use for the touch part. If as I guess it is the one connected to the ZIF cable, do you know its address? And also, do you know which registers regarding the touch interface have to be used and which ones from the RA8875?

In this article, you will learn how to use TFT LCDs by Arduino boards. From basic commands to professional designs and technics are all explained here.

In electronic’s projects, creating an interface between user and system is very important. This interface could be created by displaying useful data, a menu, and ease of access. A beautiful design is also very important.

There are several components to achieve this. LEDs,  7-segments, Character and Graphic displays, and full-color TFT LCDs. The right component for your projects depends on the amount of data to be displayed, type of user interaction, and processor capacity.

TFT LCD is a variant of a liquid-crystal display (LCD) that uses thin-film-transistor (TFT) technology to improve image qualities such as addressability and contrast. A TFT LCD is an active matrix LCD, in contrast to passive matrix LCDs or simple, direct-driven LCDs with a few segments.

In Arduino-based projects, the processor frequency is low. So it is not possible to display complex, high definition images and high-speed motions. Therefore, full-color TFT LCDs can only be used to display simple data and commands.

In this article, we have used libraries and advanced technics to display data, charts, menu, etc. with a professional design. This can move your project presentation to a higher level.

In electronic’s projects, creating an interface between user and system is very important. This interface could be created by displaying useful data, a menu, and ease of access. A beautiful design is also very important.

There are several components to achieve this. LEDs,  7-segments, Character and Graphic displays, and full-color TFT LCDs. The right component for your projects depends on the amount of data to be displayed, type of user interaction, and processor capacity.

TFT LCD is a variant of a liquid-crystal display (LCD) that uses thin-film-transistor (TFT) technology to improve image qualities such as addressability and contrast. A TFT LCD is an active matrix LCD, in contrast to passive matrix LCDs or simple, direct-driven LCDs with a few segments.

In Arduino-based projects, the processor frequency is low. So it is not possible to display complex, high definition images and high-speed motions. Therefore, full-color TFT LCDs can only be used to display simple data and commands.

In this article, we have used libraries and advanced technics to display data, charts, menu, etc. with a professional design. This can move your project presentation to a higher level.

Size of displays affects your project parameters. Bigger Display is not always better. if you want to display high-resolution images and signs, you should choose a big size display with higher resolution. But it decreases the speed of your processing, needs more space and also needs more current to run.

After choosing the right display, It’s time to choose the right controller. If you want to display characters, tests, numbers and static images and the speed of display is not important, the Atmega328 Arduino boards (such as Arduino UNO) are a proper choice. If the size of your code is big, The UNO board may not be enough. You can use Arduino Mega2560 instead. And if you want to show high resolution images and motions with high speed, you should use the ARM core Arduino boards such as Arduino DUE.

In electronics/computer hardware a display driver is usually a semiconductor integrated circuit (but may alternatively comprise a state machine made of discrete logic and other components) which provides an interface function between a microprocessor, microcontroller, ASIC or general-purpose peripheral interface and a particular type of display device, e.g. LCD, LED, OLED, ePaper, CRT, Vacuum fluorescent or Nixie.

The display driver will typically accept commands and data using an industry-standard general-purpose serial or parallel interface, such as TTL, CMOS, RS232, SPI, I2C, etc. and generate signals with suitable voltage, current, timing and demultiplexing to make the display show the desired text or image.

The LCDs manufacturers use different drivers in their products. Some of them are more popular and some of them are very unknown. To run your display easily, you should use Arduino LCDs libraries and add them to your code. Otherwise running the display may be very difficult. There are many free libraries you can find on the internet but the important point about the libraries is their compatibility with the LCD’s driver. The driver of your LCD must be known by your library. In this article, we use the Adafruit GFX library and MCUFRIEND KBV library and example codes. You can download them from the following links.

By these two functions, You can find out the resolution of the display. Just add them to the code and put the outputs in a uint16_t variable. Then read it from the Serial port by Serial.println(); . First add Serial.begin(9600); in setup().

Upload your image and download the converted file that the UTFT libraries can process. Now copy the hex code to Arduino IDE. x and y are locations of the image. sx and sy are size of the image.

In this template, We converted a .jpg image to .c file and added to the code, wrote a string and used the fade code to display. Then we used scroll code to move the screen left. Download the .h file and add it to the folder of the Arduino sketch.

In this template, We used sin(); and cos(); functions to draw Arcs with our desired thickness and displayed number by text printing function. Then we converted an image to hex code and added them to the code and displayed the image by bitmap function. Then we used draw lines function to change the style of the image. Download the .h file and add it to the folder of the Arduino sketch.

In this template, We created a function which accepts numbers as input and displays them as a pie chart. We just use draw arc and filled circle functions.

while (a < b) { Serial.println(a); j = 80 * (sin(PI * a / 2000)); i = 80 * (cos(PI * a / 2000)); j2 = 50 * (sin(PI * a / 2000)); i2 = 50 * (cos(PI * a / 2000)); tft.drawLine(i2 + 235, j2 + 169, i + 235, j + 169, tft.color565(0, 255, 255)); tft.fillRect(200, 153, 75, 33, 0x0000); tft.setTextSize(3); tft.setTextColor(0xffff); if ((a/20)>99)

while (b < a) { j = 80 * (sin(PI * a / 2000)); i = 80 * (cos(PI * a / 2000)); j2 = 50 * (sin(PI * a / 2000)); i2 = 50 * (cos(PI * a / 2000)); tft.drawLine(i2 + 235, j2 + 169, i + 235, j + 169, tft.color565(0, 0, 0)); tft.fillRect(200, 153, 75, 33, 0x0000); tft.setTextSize(3); tft.setTextColor(0xffff); if ((a/20)>99)

In this template, We display simple images one after each other very fast by bitmap function. So you can make your animation by this trick.  Download the .h file and add it to folder of the Arduino sketch.

In this template, We just display some images by RGBbitmap and bitmap functions. Just make a code for touchscreen and use this template.  Download the .h file and add it to folder of the Arduino sketch.

I took a little hiatus on this project as I got my Ham Radio License (AC3HG). During that time, I had the base station receiving data, storing it to InfluxDB and and displaying it on Graphana:

I"m now starting to work on a dedicated base station for the weather station, and I"ve selected an East Rising 7" Capacitive Touchscreen from buydispay.com as the display. These are some notes as I worked to get the screen functioning.

These screens draw a decent amount of current; on the order of 250 - 300 mA. This is way more current than the on board 3.3V regulator on an ESP32 development module can supply. You need to power the display from another power supply. Don"t as me how long it took me banging my head against a wall before I figured this out.

I"m using the Adafruit RA8875 Library to drive the display. The problem is, this library was created for an Atmel based Arduino, and not the ESP32, and this caused some problems.

When writing fonts, especially when you are enlarging fonts to 2 and 3 times their normal size, it takes a bit of time for the display to render the fonts. If you send the text too quickly, the display driver will skip characters; for example, sending tft.textWrite("12345") will only display "135". The Adafruit library just has a delay(1) to give the display driver time to render the character, but this isn"t enough for the ESP32 to render reliably. The RA8875 display driver has a WAIT pin that the Adafruit library does not implement, which is driven low when the driver is busy, and raised high when it is ready (see below). I had to implement reading the value on that pin in code to get the text rendering to work well.

in platformio.ini, so SPI is running at higher speed. A big problem, though, is there is a bug in the library when doing a bulk data transfer in the drawPixels, the speed is set to 4 MHz regardless of the board architecture. This is used when you want to draw a background image, where you will be writing to all 800 x 480 pixels, and without the fast SPI, it takes several seconds to transfer the data to the display. I just had to recode that function call. According to the RA8875 documentation, I should be able to set the SPI speed to 20 MHz, but the data transfer isn"t very reliable at that speed. This is probably because of the rat"s nest of wires on the breadboard right now, so I just sent a bunch of gerber files to China to get a PCB for further development.

So I would like to know weather my hardware and software plan is ok for a decent UI. My TFT LCDS is with built in Driver RA8875 chip. 6800 8/16 bit interface is also available.

Other than the display, the tasks we need to handle in the device is RS485 reception and some control operations which is not at all a huge task compared to UI.