How to Use 1.8 TFT SPI display : Examples, Pinouts, and Specs

The 1.8-inch TFT SPI Display (Manufacturer: SIP, Part ID: 128*160 V1.1) is a compact, high-resolution thin-film transistor (TFT) display module designed for use in embedded systems. It features a 128x160 pixel resolution and supports 65K colors, making it ideal for displaying vibrant graphics, images, and text. The display communicates via the Serial Peripheral Interface (SPI), which ensures fast and efficient data transfer while minimizing the number of required pins.

• Portable devices such as smartwatches and handheld consoles
• Embedded systems requiring graphical user interfaces (GUIs)
• IoT devices with visual feedback
• Educational and hobbyist projects using microcontrollers like Arduino or Raspberry Pi
• Industrial control panels and instrumentation displays

Below are the key technical details for the 1.8-inch TFT SPI Display:

The display module has the following pinout:

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. SPI Communication: Connect the SCL (clock) and SDA (data) pins to the corresponding SPI pins on your microcontroller.
3. Control Pins:
   • Connect the RES pin to a GPIO pin on your microcontroller for resetting the display.
   • Use the DC pin to toggle between data and command modes.
   • Connect the CS pin to a GPIO pin to enable or disable communication with the display.
4. Backlight: Connect the BLK pin to VCC to enable the backlight or to GND to disable it.

• Voltage Levels: Ensure that the logic voltage levels of your microcontroller match the display's requirements (3.3V). If your microcontroller operates at 5V, use a level shifter to avoid damaging the display.
• SPI Speed: Configure the SPI clock speed appropriately. A typical value is 4 MHz, but this may vary depending on your microcontroller and application.
• Initialization: The display requires specific initialization commands to configure the ST7735 controller. Use a compatible library (e.g., Adafruit GFX and Adafruit ST7735 libraries) to simplify this process.
• Backlight Control: For power-saving applications, consider controlling the backlight using a PWM signal from your microcontroller.

Below is an example of how to use the 1.8-inch TFT SPI Display with an Arduino UNO:

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

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

// Create an instance of the display
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  // Initialize the display
  tft.initR(INITR_BLACKTAB);  // Initialize with ST7735 Black Tab configuration
  tft.fillScreen(ST77XX_BLACK);  // Clear the screen with black color

  // Display a message
  tft.setTextColor(ST77XX_WHITE);  // Set text color to white
  tft.setTextSize(2);              // Set text size
  tft.setCursor(10, 10);           // Set cursor position
  tft.println("Hello, World!");    // Print text to the display
}

void loop() {
  // Add your code here
}

1. No Display Output:

   • Verify all connections, especially the SPI pins (SCL, SDA, CS, DC, and RES).
   • Ensure the display is powered correctly (check VCC and GND connections).
   • Confirm that the initialization code matches the display's configuration.

2. Flickering or Distorted Graphics:

   • Check the SPI clock speed. Reduce the speed if necessary.
   • Ensure proper grounding to avoid noise interference.

3. Backlight Not Working:

   • Verify the BLK pin connection. It should be connected to VCC for the backlight to turn on.
   • Check the power supply voltage to ensure it meets the display's requirements.

4. Partial or Incorrect Display:

   • Ensure the correct initialization sequence is used for the ST7735 controller.
   • Verify that the DC pin is toggled correctly between data and command modes.

Q: Can I use this display with a 5V microcontroller?
A: Yes, but you must use level shifters to convert the 5V logic signals to 3.3V to avoid damaging the display.

Q: What is the maximum SPI clock speed supported by the display?
A: The display typically supports SPI clock speeds up to 15 MHz, but 4 MHz is a safe starting point for most applications.

Q: Can I control the backlight brightness?
A: Yes, you can use a PWM signal from your microcontroller to control the brightness of the backlight.

Q: Is this display compatible with Raspberry Pi?
A: Yes, the display is compatible with Raspberry Pi. You can use libraries like luma.lcd or ST7735 for Python-based development.