Exploring ILI9341 TFT Display
Published Jan. 14, 2025, 7:17 a.m. by Ezra Ogori
In today’s guide, we’ll dive deep into interfacing the ILI9341 TFT display with the ESP32, creating a visually appealing and functional graphical user interface (GUI). Whether you’re building an IoT dashboard, an interactive device, or a simple display project, the combination of the ILI9341 and ESP32 offers power, versatility, and performance.
This tutorial is perfect for beginners and seasoned developers alike, as we’ll cover everything from hardware setup and library integration to advanced features like rendering text and images. Let’s get started!
ILI9341 and ESP32
The ILI9341 TFT display is a popular 2.4-inch to 3.5-inch screen module with vibrant colors, high resolution, and touch support (optional in some variants). It uses the SPI protocol, making it a fast and efficient choice for embedded systems.
The ESP32, on the other hand, is a powerhouse microcontroller with Wi-Fi, Bluetooth, and dual-core processing. Its high-speed SPI capabilities make it an ideal match for driving the ILI9341 display while handling complex tasks like data transmission or real-time processing.
What You’ll Need
To follow along, you’ll need the following components:
ESP32 Dev Board (e.g., ESP32-WROOM-32) ILI9341 TFT Display (SPI variant) Connecting wires or a breadboard A 5V power source or USB connection Adafruit GFX and Adafruit ILI9341 libraries Arduino IDE or PlatformIO
Step 1: Setting Up the Hardware
Pin Connection:
| Component | ESP32 Pin | ILI9341 Pin |
| TFT_DC | 18 | DC |
| TFT_CS | 23 | CS |
| TFT_RST | 19 | RST |
| VCC | 3V3 | VCC |
| GND | GND | GND |
| SCK | 13 | SCK |
| MISO | 12 | MISO (Not used in this example) |
| MOSI | 14 | MOSI |
To drive the ILI9341 display, we’ll use the Adafruit GFX and Adafruit ILI9341 libraries. These libraries simplify the process of rendering graphics and text, providing pre-built functions for drawing shapes, images, and more.
How to Install the Libraries
- Open Arduino IDE.
- Navigate to Sketch > Include Library > Manage Libraries.
- In the Library Manager, search for Adafruit GFX and click Install.
- Similarly, search for Adafruit ILI9341 and click Install.
Once installed, you’re ready to write and upload your code.
Step 3: Writing the Code
Step 4: Uploading the Code
- Connect your ESP32 to your computer using a USB cable.
- In the Arduino IDE, select your ESP32 board under Tools > Board (e.g., “ESP32 Dev Module”).
- Select the correct port under Tools > Port.
- Click Upload to compile and upload the code.
- Once the upload completes, the display should show 'EmbeddedXpress" text
Results
This is the result obtained
Applications
With the ESP32 and ILI9341, you can create projects such as:
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IoT Dashboards: Display live sensor data, device statuses, and controls.
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Wearables: Compact, low-power graphical interfaces.
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Smart Home Displays: Monitor and control home automation systems.
Happy coding!
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