1.5 tft display power consumption free sample

The ST7789 TFT module contains a display controller with the same name: ST7789. It’s a color display that uses SPI interface protocol and requires 3, 4 or 5 control pins, it’s low cost and easy to use. This display is an IPS display, it comes in different sizes (1.3″, 1.54″ …) but all of them should have the same resolution of 240×240 pixel, this means it has 57600 pixels. This module works with 3.3V only and it doesn’t support 5V (not 5V tolerant).

The ST7789 display module shown in project circuit diagram has 7 pins: (from right to left): GND (ground), VCC, SCL (serial clock), SDA (serial data), RES (reset), DC (or D/C: data/command) and BLK (back light).

As mentioned above, the ST7789 TFT display controller works with 3.3V only (power supply and control lines). The display module is supplied with 3.3V (between VCC and GND) which comes from the Arduino board.

To connect the Arduino to the display module, I used voltage divider for each line which means there are 4 voltage dividers. Each voltage divider consists of 2.2k and 3.3k resistors, this drops the 5V into 3V which is sufficient.

The first library is a driver for the ST7789 TFT display which can be installed from Arduino IDE library manager (Sketch —> Include Library —> Manage Libraries …, in the search box write “st7789” and install the one from Adafruit).

This is a quick video showing our new 1.3 inch TFT LCD. This is a small, full-color TFT. It"s controlled via 4-wire SPI. It has a ST7789H2 controller. This display runs off a single 3.3v supply which controls the logic and backlight.

This TFT kit comprises one of our smallest TFT displays and an adapter board that breaks the tail connections out to a simple 2x5 10-position header. The adapter board includes a backlight driver, so only a single 3.3v power input is required to bring up the display.

The adapter board is specifically designed for use with this display, so it fits directly behind the display with no PCB overlap. The display is a 1.3", full color, IPS display that looks incredibly sharp.

This is a graphics library for the family of small colour TFT displays based on the ST7735 and ST7789 driver chips. These are really nice displays; bright, colourful, available in a variety of useful sizes, and available at low cost from suppliers like Adafruit, AliExpress, or Banggood:

This library allows you to plot points, draw lines, draw filled rectangles, and plot text with an optional scale factor. I"ve included a demo histogram-plotting program that adjusts itself to fit each of the displays I"ve supported.

Unlike most other TFT display libraries this one doesn"t require a memory buffer, allowing it to be run on any processor down to an ATtiny85. The displays are SPI and require four pins to drive the display, leaving one pin free on an ATtiny85 to interface to another device, such as a temperature sensor. If you need more pins choose a larger chip, such as the ATtiny84; see Using the library with other AVR chips at the end of the article for information about how to convert the code for different chips.

I"ve published a library for a colour OLED display in a previous article: Colour Graphics Library. The main difference between the colour TFT displays and the colour OLED displays is that the TFT displays are not self-illuminating, and so need a backlight; they therefore have a slightly higher power consumption. However, they are exceedingly cheap, and they are available in larger sizes than the colour OLED displays.

This library will work with displays based on the ST7735 which supports a maximum display size of 132 (H) x 162 (V), or the similar ST7789 which supports a maximum display size of 240 (H) x 320 (V).

The display driver interfaces to the displays with the longer side as the vertical dimension, which is why the rectangular displays are usually listed with the longer dimension second. My library allows you to rotate the image for any desired orientation.

All the Adafruit breakout boards for these displays include level-shifting circuitry, so they will work with either 5V or 3.3V microcontroller boards. They also include an SD card socket, if that"s of interest to you. The Adafruit boards have pullups on the backlight and reset pins, so the display will work if you leave these pins unconnected.

The pullup resistor from the display"s CS pin is optional; it holds the chip select high to prevent the display from being affected by the ISP signals while programming the ATtiny85.

The different displays are catered for by six constants which specify the size of the display, the offsets relative to the area supported by the display driver, whether the display is inverted, and the rotation value; for example:

Note that on some displays you may also have to change the xoff or yoff value when rotating the display. For example, to rotate the image on the 240x240 displays by 180° use the settings:

To check or adjust the values for each display I ran this program, which draws a one-pixel border around the display area, and plots an "F" to show the orientation:

The ATtiny85 and other AVR processors supports toggling of one or more bits in a port, so provided you set all the pins to their disabled state at startup, for speed the display access routines can simply toggle the appropriate pins to enable or disable them.

The InitDisplay() routine first defines the four display pins as outputs, and takes the SCK, DC, and CS pins high (inactive). It then sends the essential configuration commands to the display.

The display memory stores 18 bits per pixel: 6 bits per colour. However, you can write to the display in three alternative modes, with 12, 16, or 18 bits per pixel. I chose the 16 bit mode, which assigns 5 bits to red, 6 bits to green, and 5 bits blue. It"s the most convenient one to work with as you simply send two bytes to define the colour of each pixel.

To clear the display the ClearDisplay() routine sends the appropriate number of zero bytes. The routine temporarily switches to 12-bit colour mode, which reduces the time to clear the display by 25%:

The library includes basic graphics routines for plotting points and drawing lines. These work on a conventional coordinate system with the origin at lower left. For example, on the 80x160 display:

My first version of PlotChar() plotted characters by calling PlotPoint() for each pixel. However, I then tried the following alternative approach which defines an area of the display using the CASET (Column Address Set) and RASET (Row Address Set) commands, and then sends a stream of the appropriate bytes to define the character. This turned out to be over three times faster!

14th January 2020: Tested the program with the Adafruit 1.3" 240x240 TFT display, and updated the program to correct a problem when rotating the image on that display.

I finished the class HX8347A with 24 functions for the Arduino IDE 1.5.X. I started to play a bit with it and made a clock sketch based on Markus_L811"s RTC library (Thank you Markus!). Here the sketch and a picture to give an idea about how it looks (still raw but much better).

I ordered one and I hope to receive it today to test it, but again, I believe that any LCD with HX8347A display driver with parallel (16-bit) operating mode should work.

I have not investigated as to whether this display with work with the Adafruit or U8G2 libraries. I tend to think it will not - but I don"t know this to be true. If I discover that this display is supported in those libs, I will update my review - based on the efforts of those libs. If it did work, the vendor would probably promote that, somewhere.

I usually like products from this vendor, and I hate to write a review this bad, but this display is not ready for general consumption (perhaps beta testing for those inclined). IMO, there"s too much of the "get it in the door, and toss it against the wall and see if it sells", going on here.

If I discover, at some point, some improved docs that TRULY have a working example, I will try them, and then update my review. The point of these reviews is to tell people how useful, or how miserable a product is - AS IS (not what it hopes to be one day). In my opinion, this product is not useful to me at this time. For now I"ll keep going with the 0.91" and 0.96" popular 1306 displays as I need to produce, not tinker endlessly.

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This equipment manual is part of our Intelligent TFT-LCD Module documentation. It provides the information in regards of operation, installation, configuration, function, system as well as its technical design and working principle.

TTL/ LANport,Wi-Fi / Bluetooth,touchscreen, power supply etc., so it is a whole display system based on the powerful & easy operating system,which can be controlled by Any MCU.

The STWI101WT-01 can be used to perform all basic functions, such as text display, image display, curve display as well as touch function, Video & Audio functionetc. The User Interface can be more abundant and various. And the flash memory can store your data, configuration files,imagefile, font file, video file and audio fileetc.

Important: The text content should be with the quotes(“”), including widgets’ name but the value content shouldn’t be with the quotes, such as value or true/false states. Passive command (TFT-LCD ModuleàMCU)

The TFT LCD moduleserial port command frame is composed of 5 data blocks, shown as the table1-1.6. All serial port commands or data are represented with hex format. The data transfer in MSB manner. E.g. for 0x1234, first send 0x12 and then send 0x34. Definition Frameheader Command length Data Frame tail CRC check code

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