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📌Introduction
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This Arduino tutorial shows how to interface the Uno board with ILI9341 TFT display.
The ILI9341 TFT module contains a display controller with the same name: ILI9341. It’s a color display that uses SPI interface protocol and requires 4 or 5 control pins, it’s low cost and easy to use. The resolution of this TFT display is 240 x 320 which means it has 76800 pixels. This module works with 3.3V only and it doesn’t support 5V (not 5V tolerant).
TFT: Thin-Film Transistor.
SPI: Serial Peripheral Interface.
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📌 Designing and Working
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The ILI9341 TFT display board which is shown in the circuit diagram above has 14 pins, the first 9 pins are for the display and the other 5 pins are for the touch module.
So, the display side pins which numbered from 1 to 9 are (from left to right): VCC (5V), GND (ground), CS (chip select), RST (reset), DC (or D/C: data/command), MOSI (or SDI), SCK (clock), BL (back light LED) and MISO (or SDO).
MOSI: master-out slave-in.
SDI: serial data in.
MISO: master-in slave-out.
SDO: serial data out.
As mentioned above, the ILI9341 TFT display controller works with 3.3V only (power supply and control lines). The display module is supplied with 5V that comes from the Arduino board. This module has a built-in 3.3V regulator which supplies the display controller with 3.3V from the 5V source.
All Arduino UNO board output pins are 5V, connecting a 5V pin to the ILI9341 TFT display may damage its controller.
To connect the Arduino to the display module, I used voltage divider for each line which means there are 5 voltage dividers. Each voltage divider consists of 2.2k and 3.3k resistors, this drops the 5V into 3V which is sufficient.
So, the ILI9341 TFT display is connected to the Arduino board as follows
1. CS pin is connected to Arduino digital pin 8,
2. RST pin is connected to Arduino digital pin 9,
3. D/C pin is connected to Arduino digital pin 10,
4. MOSI pin is connected to Arduino digital pin 11,
5. SCK pin is connected to Arduino digital pin 13.
Other pins are connected as follows:
1. VCC pin is connected to Arduino 5V pin,
2. GND pin is connected to Arduino GND pin,
3. BL (LED) pin is connected to Arduino 5V pin,
4. MISO pin is not connected.
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📌 Tags
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#arduino #II9341 #TFT
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📌 The Code
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Source code given in comment section, The following Arduino code requires two libraries from Adafruit Industries:
The first library is a driver for the ILI9341 TFT display which can be installed from Arduino IDE library manager (Sketch/Include Library/Manage Libraries …, in the search box write “ili9341” and choose the one from Adafruit).
The second library is Adafruit graphics library which can be installed also from Arduino IDE library manager.
Go to Arduino IDE /Sketch/Include Library/Add .ZIP Library … and browse for the .zip file.
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Copyright Disclaimer under Section 107 of the copyright act 1976, allowance is made for fair use for purposes such as criticism, comment, news reporting, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favour of fair use.
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