adafruit 1.14 240x135 color tft display made in china

This project is a microcontroller board, based on an ATtiny414, that can accommodate a range of different Adafruit and AliExpress colour TFT displays:

It"s ideal for use with my Tiny TFT Graphics Library 2, and includes an I2C interface and optional crystal, making it suitable for use in sensor and clock projects.

While working on my Tiny TFT Graphics Library I needed to test it with several different TFT displays on a prototyping board, and noticed that many of them, with a small number of exceptions, had one of two standard pin connection layouts. That gave me the idea of designing a breakout board that would take any of these displays, and be a great starting point for a variety of display-based projects.

The board accommodates any of a variety of Adafruit or AliExpress colour TFT displays – for details see the tables below. The display connection header pin holes are staggered so you can push the display in place, and it will stay firmly connected without soldering. This is especially useful if you want to try different displays in an application.

Although you could drive these TFT displays from an 8-pin ATtiny processor such as the ATtiny402, I decided to base the board on a 14-pin device, such as the ATtiny414, to allow it to offer the following additional optional features:

Use the 11-way row of pins for Adafruit displays. Note that a couple of Adafruit TFT displays have an incompatible pinout; if you"re not sure whether your display is compatible check that it has the following 11-way pin header:

The Adafruit displays all include an LDO 3.3V regulator and logic-level translation, so can be safely interfaced to processors powered from either 5V or 3.3V. They also include an SD-card socket, and a separate SDCS select line for the SD card.

Some of the AliExpress displays include a LDO 3.3V regulator, but none of them include logic-level translation, so I recommend only interfacing them to a processor running from 3.3V.

The header pin holes are staggered, with each hole shifted 8 mil (~0.2 mm) off-centre. This allows you to push the display"s pin headers in place, and they will stay firmly connected without soldering. To remove them press evenly with a suitable flat object. Of course you also have the option of soldering them if you prefer, for a permanent solution.

The processor can be any of the 0-series, 1-series, or 2-series ATtiny range in a 14-pin SOIC package, from the ATtiny404 to the ATtiny3224, but note that the timer crystal is only supported by a 1-series or 2-series device. They are all software compatible, so the same program will work on any of them. My Tiny TFT Graphics Library 2 needs more than 2Kbytes so I don"t recommend using the ATtiny204 or ATtiny214, which only have 2Kbytes of program memory.

If you want to control the backlight, or use the SD-card socket on the Adafruit displays, fit 0Ω resistors in the appropriate positions to act as links. Alternatively PA5 and PA6 are available on header pins D1 and D2 for other uses.

The Universal TFT Display Backpack is ideal for use with my Tiny TFT Graphics Library 2, which is optimised for use with ATtiny microcontrollers such as the ATtiny414. You could also use my Compact TFT Graphics Library which uses standard Arduino SPI routines, but I"m not sure why you would want to as it"s not as fast as the Tiny TFT library.

If you"ve fitted the leftmost 0Ω link resistor, you can use PA5 (Arduino pin 1) to control the display backlight. For example, to turn the backlight off:

Compile the program using Spence Konde"s megaTiny Core on GitHub. Choose the ATtiny3224/1624/1614/1604/824/814/804/424/414/404/241/204 option under the megaTinyCore heading on the Board menu. Check that the subsequent options are set as follows (ignore any other options):

Then upload the program to the Universal TFT Display Backpack using a UPDI programmer. The recommended option is to use a USB to Serial board, such as the SparkFun FTDI Basic board

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