How to Use ESP32 TFT 3.5 CYD: Examples, Pinouts, and Specs

The ESP32 TFT 3.5 CYD is a versatile 3.5-inch TFT display module integrated with an ESP32 microcontroller. This component combines a high-resolution graphical display with the powerful wireless communication capabilities of the ESP32, making it ideal for IoT projects, smart devices, and interactive user interfaces. Its built-in Wi-Fi and Bluetooth functionality, along with the vibrant TFT display, allow developers to create visually appealing and connected applications.

• IoT dashboards and control panels
• Smart home devices with graphical interfaces
• Portable gaming consoles
• Data visualization for sensors and embedded systems
• Educational and prototyping projects

1. Power Supply: Connect the VCC pin to a 3.3V power source and the GND pin to ground.
2. SPI Communication: Connect the CS, SCK, MOSI, and DC pins to the corresponding SPI pins on your microcontroller (e.g., Arduino or ESP32).
3. Reset Pin: Connect the RST pin to a GPIO pin on your microcontroller for resetting the display.
4. Touch Functionality (Optional): If using the touch feature, connect the T_CS and T_IRQ pins to GPIO pins on your microcontroller.

• Voltage Levels: Ensure all connected pins operate at 3.3V logic levels. Using 5V logic may damage the display or ESP32.
• Power Supply: Use a stable power source to avoid flickering or instability in the display.
• SPI Speed: Configure the SPI clock speed appropriately (typically 40 MHz or lower) to ensure reliable communication.
• Library Support: Use libraries like TFT_eSPI or Adafruit_GFX for easier integration and control of the display.

Below is an example of how to initialize and display text on the ESP32 TFT 3.5 CYD using the TFT_eSPI library:

#include <TFT_eSPI.h> // Include the TFT_eSPI library

TFT_eSPI tft = TFT_eSPI(); // Create an instance of the TFT_eSPI class

void setup() {
  tft.init(); // Initialize the display
  tft.setRotation(1); // Set display orientation (1 = landscape)
  tft.fillScreen(TFT_BLACK); // Clear the screen with black color

  tft.setTextColor(TFT_WHITE, TFT_BLACK); // Set text color (white on black)
  tft.setTextSize(2); // Set text size

  tft.setCursor(10, 10); // Set cursor position
  tft.println("Hello, ESP32 TFT!"); // Print text to the display
}

void loop() {
  // Add your code here for dynamic updates or animations
}

• Install the TFT_eSPI library via the Arduino Library Manager.
• Configure the User_Setup.h file in the TFT_eSPI library to match the pin connections of your ESP32 TFT 3.5 CYD module.

1. Display Not Turning On:

   • Verify the power connections (VCC and GND).
   • Ensure the SPI pins are correctly connected and configured in the code.

2. Flickering or Unstable Display:

   • Check for a stable power supply.
   • Reduce the SPI clock speed in the library configuration.

3. Touch Functionality Not Working:

   • Ensure the T_CS and T_IRQ pins are connected.
   • Verify that the touch controller is enabled in the library settings.

4. No Output on the Display:

   • Confirm that the CS, DC, and RST pins are correctly connected.
   • Double-check the pin definitions in your code.

Q: Can I use this module with a 5V microcontroller like Arduino UNO?
A: The ESP32 TFT 3.5 CYD operates at 3.3V logic levels. If using a 5V microcontroller, you must use level shifters to avoid damaging the module.

Q: What is the maximum SPI clock speed supported?
A: The module typically supports SPI clock speeds up to 40 MHz. However, lower speeds may be required for stable operation.

Q: Does the module support capacitive touch?
A: Yes, the module includes optional capacitive touch functionality. Ensure the touch-related pins are connected and configured in your code.

Q: Can I use this module without the touch feature?
A: Yes, the touch functionality is optional. You can use the display for graphical output without connecting the touch-related pins.

Q: Is there a recommended library for this module?
A: The TFT_eSPI library is highly recommended for this module due to its performance and compatibility with the ILI9488 controller.