DollaTek 1.44 Inch TFT LCD Module ST7735 User Manual

1. Uvod

This manual provides detailed instructions for the setup, operation, and maintenance of the DollaTek 1.44 Inch TFT LCD Module, featuring the ST7735 controller. This compact display is designed for integration with various microcontrollers, including Arduino and ARM platforms, offering a 128x128 pixel, 65K color display via a Serial Peripheral Interface (SPI).

2. Značajke proizvoda

• Veličina ekrana: 1.44 inča
• Materijal za prikaz: TFT LCD
• rezolucija: 128 x 128 piksela
• Kontrolni čip: ST7735
• Dubina boje: 65K boja
• Vrsta interfejsa: SPI (serijski periferni interfejs)
• Broj pinova: 8-pinski interfejs
• Working Voltage: 2.8V - 3.3V
• Radna temperatura: -20°C do 70°C
• Visok kontrast i širok viewing angle for clear visuals.

Figure 2.1: The DollaTek 1.44 Inch TFT LCD Module, highlighting its ST7735 controller chip.

Figure 2.2: The display module showcasing its high contrast and wide viewing angle capabilities with a sample image.

3. Postavljanje i instalacija

3.1 Definicija pinova

The module features an 8-pin interface. Understanding each pin's function is crucial for proper connection.

3.2 Vodič za povezivanje

Connect the module to your microcontroller using the SPI interface. Pay close attention to the voltage zahtjevi:

• The module operates at 3.3V logički nivoi.
• If connecting to a 5V microcontroller (e.g., Arduino UNO), a logic level shifter is highly recommended for the SPI data lines (SCL, SDA, RES, DC, CS) to prevent damage to the display module.
• Connect GND to the microcontroller's ground.
• Connect VCC to a 3.3V power supply from your microcontroller or an external source.
• The BLK pin can be left floating for default backlight operation or connected to a digital pin for software control (pull low to turn off backlight).

Figure 3.1: Physical dimensions of the DollaTek 1.44 Inch TFT LCD Module.

Slika 3.2: Pozadi view of the module, showing the PCB and the ST7735 driver IC.

4. Uputstvo za upotrebu

To operate the DollaTek 1.44 Inch TFT LCD Module, you will typically use a compatible library for your chosen microcontroller platform. For Arduino, the Adafruit ST7735 library is a widely used and well-supported option.

4.1 Basic Operation Steps:

1. Instaliraj biblioteku: Download and install the appropriate library for the ST7735 controller on your development environment (e.g., Arduino IDE Library Manager).
2. Include Header: In your code, include the necessary header files for the display and SPI communication.
3. Initialize Display: Call the display initialization function, passing the correct pin assignments for CS, DC, and RES.
4. Set Rotation (Optional): Configure the display orientation if needed.
5. Obriši ekran: Fill the screen with a background color.
6. Draw Graphics/Text: Use the library's functions to draw pixels, lines, shapes, and display text at desired coordinates and colors.
7. Update Display: Some libraries require an explicit command to push the buffer to the display.

Pogledajte pramples provided with the ST7735 library for detailed code implementation.

5. Otkrivanje problema

• Prazan ekran:
  • Verify all connections (GND, VCC, SPI pins) are secure and correct.
  • Ensure the module is receiving 3.3V power.
  • Check if a logic level shifter is used when connecting to 5V microcontrollers. Incorrect voltage levels can prevent the display from initializing or cause damage.
  • Confirm your code correctly initializes the ST7735 controller and sends display commands.
  • Check the BLK pin; if pulled low, the backlight will be off.
• Incorrect Colors or Distorted Display:
  • Double-check SPI data line connections (SDA, SCL).
  • Ensure the correct display initialization sequence is used in your code, as different ST7735 variants might have slight differences.
  • Verify that the library is configured for the correct color mode (e.g., RGB vs. BGR).
• Physical Stain on Screen: If a yellow or other colored stain appears on the screen, it may indicate a manufacturing defect or physical damage. Contact customer support for assistance.

6. Održavanje

• čišćenje: Use a soft, dry, anti-static cloth to gently wipe the display surface. Avoid abrasive materials or harsh chemical cleaners.
• Rukovanje: Handle the module by its edges to avoid touching the display area or the sensitive electronic components on the PCB.
• Skladištenje: Store the module in a dry, dust-free environment, away from direct sunlight and extreme temperatures.

7. Specifikacije

8. Podrška i garancija

For technical support, inquiries, or warranty information regarding your DollaTek 1.44 Inch TFT LCD Module, please refer to the retailer's return policy or contact DollaTek customer service directly through their official channels. Please have your purchase details and model number (ST7735) available when contacting support.