UNO digital pin 11 through a 1K2 resistor to display pin 6 (SDI/MOSI), add a 1K8 resistor from display pin 6 to GND. UNO digital pin 9 through a 1K2 resistor to display pin 3 (CS), add a 1K8 resistor from display pin 3 to GND. UNO digital pin 8 through a 1K2 resistor to display pin 5 (DC/RS), add a 1K8 resistor from display pin 5 to GND. UNO digital pin 7 through a 1K2 resistor to display pin 4 (RESET), add a 1K8 resistor from display pin 4 to GND. UNO +5V through a 56 Ohm resistor to display pin 8 (LED). Connect the display to the UNO as follows: To use this display load the Adatfruit_IL9341_AS and Adafruit_GFX_AS libraries. You can also now use the 2.2" QVGA TFT SPI display based on the ILI9341 driver. Ideally we could use a level shifter but the resistors work fine. The 1K2 resistors are required to protect the display being damaged by the 5V logic levels from the UNO, these limit the current flow. 
UNO digital pin 13 through a 1K2 resistor to display pin 5 (CLK). UNO digital pin 11 through a 1K2 resistor to display pin 4 (DIN). UNO digital pin 9 through a 1K2 resistor to display pin 2 (CS). UNO digital pin 8 through a 1K2 resistor to display pin 3 (D/C). UNO digital pin 7 through a 1K2 resistor to display pin 1 (RST). UNO +5V to display pin 6 (VCC) and pin 7 (BL). I used the Arduino UNO and linked it to the 1.8" S6D02A1 based display as follows: Compatibility with the Adafruit GFX library has been maintained. 
This library is called TFT_ILI9341 and is a stand alone library that does not need the support of another GFX library. I have added a new library for the 2.2" TFT QVGA 240x320 pixel display with the ILI9341 driver. I have now added a driver library for the 1.8" TFT display based on the ST7735 driver along with examples. I have now added a driver library below for the 2.2" TFT QVGA 240x320 pixel display with the ILI9341 driver.
After trying some examples I was a little disappointed that only scaled blocky fonts were available - so I have modified the original libraries to add some new fonts and functions. This library is used in conjunction with the Adafruit_GFX library. Eventually I found that the ones I had bought used the Samsung S6D02A1 driver chip and I had been trying to use the wrong library.Īfter a brief search on the web I came across the Adafruit_QDTech library which worked really well.
Recently I bought a few cheap 1.8" TFT displays for a project, initially I could not get them working which was frustrating. I am quite a fan of the Arduino as there is so much software already available on the internet, this makes completing new projects easier!
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