How to Use mcudev_tft1.44: Examples, Pinouts, and Specs

The MCUDEV_TFT1.44 is a compact 1.44-inch TFT display module designed for use in microcontroller-based applications. With a resolution of 128x128 pixels, this module is ideal for displaying graphics, text, and simple animations in embedded systems. It features a vibrant color display and is commonly used in projects requiring a small, low-power graphical interface.

• Wearable devices
• IoT dashboards
• Portable measurement tools
• Educational and hobbyist projects
• Small graphical user interfaces (GUIs) for embedded systems

The following table outlines the key technical details of the MCUDEV_TFT1.44 module:

The MCUDEV_TFT1.44 module has an 8-pin interface. The table below describes each pin:

To use the MCUDEV_TFT1.44 module, connect it to a microcontroller such as an Arduino UNO. Below is a typical wiring configuration:

The following Arduino sketch demonstrates how to initialize and display basic graphics on the MCUDEV_TFT1.44 module using the Adafruit GFX and Adafruit ST7735 libraries.

#include <Adafruit_GFX.h>    // Core graphics library
#include <Adafruit_ST7735.h> // Library for ST7735 controller
#include <SPI.h>             // SPI library

// Define TFT pins
#define TFT_CS   10  // Chip Select pin
#define TFT_RST  8   // Reset pin
#define TFT_DC   9   // Data/Command pin

// Initialize the display object
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  // Initialize the TFT display
  tft.initR(INITR_144GREENTAB); // Use the 1.44" green tab initialization
  tft.fillScreen(ST77XX_BLACK); // Clear the screen with black color

  // Display a message
  tft.setTextColor(ST77XX_WHITE); // Set text color to white
  tft.setTextSize(1);             // Set text size to 1
  tft.setCursor(10, 10);          // Set cursor position
  tft.println("Hello, World!");   // Print text to the screen

  // Draw a red rectangle
  tft.fillRect(20, 30, 50, 50, ST77XX_RED);
}

void loop() {
  // Nothing to do here
}

1. Voltage Levels: Ensure that the logic level of your microcontroller matches the 3.3V requirement of the display. If using a 5V microcontroller (e.g., Arduino UNO), use level shifters or voltage dividers for the SPI pins.
2. Backlight Control: The backlight pin (BLK) can be connected to a PWM pin on the microcontroller for brightness control.
3. Library Compatibility: Use the Adafruit GFX and Adafruit ST7735 libraries for easy integration and access to advanced graphics functions.

1. No Display Output
   • Solution: Verify all connections, especially the SPI pins (SCL, SDA, CS, DC, RES). Ensure the power supply is stable and at 3.3V.
2. Flickering or Unstable Display
   • Solution: Check for loose connections or poor solder joints. Ensure the SPI clock speed is not too high (try reducing it in the library settings).
3. Incorrect Colors or Graphics
   • Solution: Confirm that the correct initialization code (INITR_144GREENTAB) is used for the display.

1. Can I use this display with a 5V microcontroller?
   • Yes, but you must use level shifters or voltage dividers to step down the 5V logic signals to 3.3V.
2. What is the maximum SPI clock speed supported?
   • The ST7735 controller typically supports SPI clock speeds up to 15 MHz. However, for stability, it is recommended to use a lower speed (e.g., 4 MHz).
3. Can I control the backlight brightness?
   • Yes, connect the BLK pin to a PWM-capable pin on your microcontroller and use analogWrite() to adjust brightness.

This concludes the documentation for the MCUDEV_TFT1.44 module.