Okay, here is the Arduino code to display 'Hello, Gemini 2.5 Pro' on a 128x128 ST7735 TFT display with a blue-to-pink gradient background. **Before you upload:** 1. **Install Libraries:** You'll need the `Adafruit GFX Library` and the `Adafruit ST7735 Library`. You can install them using the Arduino Library Manager (Sketch -> Include Library -> Manage Libraries...). Search for and install both. 2. **Check Connections:** Verify your TFT display's pin connections to the Arduino Uno. The code uses common default pins, but you might need to adjust the `TFT_CS`, `TFT_DC`, and `TFT_RST` definitions if your wiring is different. * TFT SCK -> Uno D13 * TFT MOSI -> Uno D11 * TFT CS -> Uno D10 * TFT DC (or A0) -> Uno D9 * TFT RST -> Uno D8 * TFT VCC -> Uno 5V * TFT GND -> Uno GND * TFT BL (Backlight) -> Uno 3.3V or 5V (check display datasheet) 3. **TFT Driver Chip:** This code assumes an ST7735 driver with the 'Black Tab' initialization (`INITR_BLACKTAB`). If your screen remains black, white, or shows distorted colors, try changing `tft.initR(INITR_BLACKTAB);` to `tft.initR(INITR_GREENTAB);` or `tft.initR(INITR_REDTAB);` or `tft.initR(INITR_144GREENTAB);` depending on your specific display model. cpp #include // Core graphics library #include // Hardware-specific library for ST7735 #include // Define TFT Pin Connections (adjust if your wiring is different) #define TFT_CS 10 // Chip Select goes to Arduino pin 10 #define TFT_RST 8 // Reset goes to Arduino pin 8 #define TFT_DC 9 // Data/Command (or A0) goes to Arduino pin 9 // SCK (CLK) -> Arduino pin 13 (Hardware SPI) // MOSI (SDA) -> Arduino pin 11 (Hardware SPI) // Create an instance of the ST7735 library // Use this for 128x128 black tab: Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST); // Use this for 128x128 green tab: // Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST); // Use this for 128x128 red tab: // Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST); // Use this for 1.44" green tab: // Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST); // Define gradient colors (RGB565 format) #define COLOR_BLUE 0x001F // Pure Blue #define COLOR_PINK 0xFD19 // A nice Pink (R=31, G=48, B=25) void setup(void) { Serial.begin(9600); Serial.print(F("Hello! ST7735 TFT Test\n")); // Initialize the display. Try INITR_BLACKTAB first. // If it doesn't work, comment it out and uncomment one of the others. tft.initR(INITR_BLACKTAB); // Init ST7735S chip, black tab //tft.initR(INITR_GREENTAB); // Init ST7735S chip, green tab //tft.initR(INITR_REDTAB); // Init ST7735S chip, red tab //tft.initR(INITR_144GREENTAB); // Init ST7735 for 1.44" display, green tab Serial.println(F("Initialized")); uint16_t time = millis(); tft.setRotation(0); // Set display orientation (0 or 2 for portrait on 128x128) tft.fillScreen(ST77XX_BLACK); // Start with a black screen time = millis() - time; Serial.print(F("Screen fill time: ")); Serial.println(time); // Draw the gradient background drawGradientBackground(); // Set text properties tft.setTextWrap(true); // Allow text wrapping tft.setTextColor(ST77XX_WHITE); // White text color tft.setTextSize(1); // Standard text size (6x8 pixels) // --- Display Text --- String line1 = "Hello,"; String line2 = "Gemini 2.5 Pro"; // Calculate position for centered text (two lines) int16_t x1, y1; uint16_t w1, h1, w2, h2; int16_t textHeight = 8; // Height of size 1 text int16_t lineSpacing = 4; // Space between lines int16_t totalTextHeight = textHeight * 2 + lineSpacing; tft.getTextBounds(line1, 0, 0, &x1, &y1, &w1, &h1); tft.getTextBounds(line2, 0, 0, &x1, &y1, &w2, &h2); int16_t cursorY_line1 = (tft.height() - totalTextHeight) / 2; int16_t cursorX_line1 = (tft.width() - w1) / 2; int16_t cursorY_line2 = cursorY_line1 + textHeight + lineSpacing; int16_t cursorX_line2 = (tft.width() - w2) / 2; // Print the first line tft.setCursor(cursorX_line1, cursorY_line1); tft.print(line1); // Print the second line tft.setCursor(cursorX_line2, cursorY_line2); tft.print(line2); Serial.println(F("Text displayed.")); } void loop() { // Nothing to do in the loop for a static display delay(1000); // Keep the Arduino busy } // Function to draw a vertical gradient from Blue to Pink void drawGradientBackground() { uint16_t startColor = COLOR_BLUE; uint16_t endColor = COLOR_PINK; // Extract R, G, B components (5-bit R, 6-bit G, 5-bit B) uint8_t r1 = (startColor >> 11) & 0x1F; uint8_t g1 = (startColor >> 5) & 0x3F; uint8_t b1 = startColor & 0x1F; uint8_t r2 = (endColor >> 11) & 0x1F; uint8_t g2 = (endColor >> 5) & 0x3F; uint8_t b2 = endColor & 0x1F; int16_t h = tft.height(); int16_t w = tft.width(); for (int16_t y = 0; y < h; y++) { // Calculate interpolated color components for this row float factor = (float)y / (h - 1); uint8_t r = r1 + (r2 - r1) * factor; uint8_t g = g1 + (g2 - g1) * factor; uint8_t b = b1 + (b2 - b1) * factor; // Combine components back into RGB565 color uint16_t rowColor = (r << 11) | (g << 5) | b; // Draw a horizontal line with the calculated color tft.drawFastHLine(0, y, w, rowColor); } } Upload this code to your Arduino Uno. Once uploaded, the TFT display should show the text "Hello," centered on the top half and "Gemini 2.5 Pro" centered on the bottom half, over a smooth vertical gradient background transitioning from blue at the top to pink at the bottom.