SPIOLEDdisplay

Remember:  If you are using a 3.3V MCU, these lines can be connected directly.  If you are using a 5V MCU, then be sure to use a logic level converter like shown at the bottom of the page.

The program below is a modified version of the Mandelbrot example program that gets installed with the Adafruit_ILI9341 library.  It was pruned down in size and basic touch added.  The program just calculates the Mandelbrot set and draws it to the screen pixel-by-pixel as it is calculated.  The math is fairly intense for each pixel, so it is a good judge of the power of the MCU.  The display update speed is thus limited by the MCU that is doing the calculations and is not limited by the display itself.

Though these displays can seem to be a bit intimidating to use at first, just follow these steps to get up and running fairly easily.  The pin labeling is on the back only, so we have pictures with the pins labeled on both the front and back to make life a little easier.

The SD card socket comes out to solder pads on the opposite end of the module.  There are reports of this socket not working without modification.

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The touch screen also uses the SPI interface and can hook up to the same pins as the display.  It does use a separate CS to avoid conflict.

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SPITFTdisplayArduino

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The module power comes in on the Vcc pin.  The module includes an on-board 3.3V regulator, so the module should normally be operated off of 3.6 to 5.5V power on this pin to feed the regulator.  Current is typically 55-60mA

If you plan to use this socket, you should take a look at this thread on the Teensy forums about possible modifications that may be required.

SPILCDdisplayArduino

These full color displays are large enough for many applications even when using touch.  The supplied stylus is helpful when using smaller touch targets.

This display incorporates the SPI interface which provides for fast display updates.  It is a 4-wire interface so includes a CS (Chip Select).

SPILCDDisplay

In general, it is best to operate the display off of 5V to ensure enough power is available.  Be careful of trying to operate the display from the built-in 3.3V available on Arduino and similar microcontrollers since these power sources often have limited current capability and may overheat.

If you just want to check the display functionality and speed, the ‘graphicstest’ example program installed as part of the Adafruit_ILI9341 library is a good one to run.

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SPI displayRaspberry Pi

The display can be rotated in all 4 directions.  Use setRotation(n) to rotate the image to match the physical rotation where n ranges from 0 to 3.

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SPIInterface

Connect the SPI and control lines for the display.  In our example we are using hardware SPI as it gives the best performance.   The SPI pin location will depend on the MCU you are using.

I’m also using the Teensy 4.1 because it is currently the fastest Arduino compatible board (600MHz 32-bit vs Uno 16MHz 16-bit) and this example application of calculating Mandelbrot fractals and updating the LCD can take a long time on an Uno (77-105 seconds) and only takes about 1.25 seconds on the Teensy 4.1.  If using a 3.3V Arduino like a Due, hookup will basically be the same.

SPILCD STM32

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This 3.2″ TFT LCD is a full color display with a resolution of 240 x 320 pixels or 320 x 240 pixels depending on how it is oriented.  It uses the ILI9341 controller with SPI interface.  It also includes a resistive touchscreen with built-in XPT2046 controller.

I2CDisplay

Internally the display operates at 3.3V, so if using with a 5V microcontroller, be sure to include        logic level shifters on the data lines to prevent possible damage.

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These are interesting modules to work with since they have full color and graphical capability with good library support and the touch capability adds a new dimension of usefulness.

After drawing the first screen, it waits until the touchscreen is touched and then it zooms in slightly and redraws the screen.  It also reports the touch location information out to the Serial Monitor window and also reports how long it took to calculate that screen.  If you want to evolve the program as an exercise, it would be interesting to use the touch coordinates to center the new zoom.

These modules are breadboard friendly with a 14-pin header on the back that can be inserted into a solderless breadboard or a 14-pin female connector can be used to connect to it if the display is to be mounted.  The display is mounted on a stiff PCB that provides good support, but be sure to press on the header pins or PCB when applying pressure to insert them into a breadboard and not press on the glass to avoid possible damage.

You will also need to set the rotation of the touch screen.  The number do not match, so use one of the following combinations.

Because of the 3.3V I/O requirement, I am using a Teensy 4.1 for easier hookup but any 3.3V MCU can be used.  If using an Uno or other 5V MCU, be sure to include level shifters on the data lines going to the display (CS, DC, SDI, SCK, T_CLK, T_CS, T_DIN).  It is not required on the SDO or T_DO lines since these are outputs to the MCU.

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If you would prefer to operate the module directly from a 3.3V power source, there are two solder pads labeled J1.  By solder shorting these two pads together, the regulator is bypassed and the module can be powered directly from 3.3V.