Aansluitschema en codevoorbeeld

Zo sluit je de 1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino aan op een Arduino UNO of ESP32, met een voorbeeldsketch die je direct kunt uploaden.

Arduino UNO ESP32 DevKit V1

1.28 Inch Ronde GC9A01 TFT LCD Demo

Dit project initialiseert en tekent geanimeerde graphics op een ronde 1.28-inch SPI TFT-display (GC9A01-controller). Het tekent kleurrijke concentrische ringen rond het cirkelvormige scherm en laat voortdurend de kleur van een binnenste doelcirkel veranderen.

Aansluitschema: 1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino op een Arduino UNO — Aansluitschema · Klik om te vergroten

Aansluittabel: 1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino op een Arduino UNO — Aansluittabel · Klik om te vergroten

1_28_Inch_Round_GC9A01_TFT_LCD_Demo.ino · gecompileerd en getest

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : 1.28 Inch Round GC9A01 TFT LCD Demo
 *  Board     : Arduino UNO (arduino:avr:uno)
 *  Parts     : 1.28" Round TFT LCD 240x240 (GC9A01, SPI)
 *  Libraries : none (built-in)
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

#include <SPI.h>

#define TFT_CS   10
#define TFT_DC    9
#define TFT_RST   8

#define COLOR_BLACK   0x0000
#define COLOR_BLUE    0x001F
#define COLOR_RED     0xF800
#define COLOR_GREEN   0x07E0
#define COLOR_CYAN    0x07FF
#define COLOR_MAGENTA 0xF81F
#define COLOR_YELLOW  0xFFE0
#define COLOR_WHITE   0xFFFF

const uint16_t palette[] = {COLOR_RED, COLOR_GREEN, COLOR_BLUE, COLOR_YELLOW, COLOR_CYAN, COLOR_MAGENTA};
int colorIndex = 0;

void writeCommand(uint8_t c) {
  digitalWrite(TFT_DC, LOW);
  digitalWrite(TFT_CS, LOW);
  SPI.transfer(c);
  digitalWrite(TFT_CS, HIGH);
}

void writeData(uint8_t d) {
  digitalWrite(TFT_DC, HIGH);
  digitalWrite(TFT_CS, LOW);
  SPI.transfer(d);
  digitalWrite(TFT_CS, HIGH);
}

void setWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
  writeCommand(0x2A);
  writeData(x0 >> 8); writeData(x0 & 0xFF);
  writeData(x1 >> 8); writeData(x1 & 0xFF);
  writeCommand(0x2B);
  writeData(y0 >> 8); writeData(y0 & 0xFF);
  writeData(y1 >> 8); writeData(y1 & 0xFF);
  writeCommand(0x2C);
}

void fillScreen(uint16_t color) {
  setWindow(0, 0, 239, 239);
  digitalWrite(TFT_DC, HIGH);
  digitalWrite(TFT_CS, LOW);
  uint8_t hi = color >> 8;
  uint8_t lo = color & 0xFF;
  for (uint32_t i = 0; i < 240UL * 240UL; i++) {
    SPI.transfer(hi);
    SPI.transfer(lo);
  }
  digitalWrite(TFT_CS, HIGH);
}

void drawHLine(int16_t x, int16_t y, int16_t w, uint16_t color) {
  if (y < 0 || y >= 240 || x >= 240 || (x + w) <= 0) return;
  int16_t x1 = max(0, x);
  int16_t x2 = min(239, x + w - 1);
  int16_t len = x2 - x1 + 1;
  setWindow(x1, y, x2, y);
  digitalWrite(TFT_DC, HIGH);
  digitalWrite(TFT_CS, LOW);
  uint8_t hi = color >> 8;
  uint8_t lo = color & 0xFF;
  for (int16_t i = 0; i < len; i++) {
    SPI.transfer(hi);
    SPI.transfer(lo);
  }
  digitalWrite(TFT_CS, HIGH);
}

void fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color) {
  for (int16_t dy = -r; dy <= r; dy++) {
    int16_t dx = sqrt((long)r * r - (long)dy * dy);
    drawHLine(x0 - dx, y0 + dy, dx * 2 + 1, color);
  }
}

void drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color) {
  int16_t f = 1 - r, ddF_x = 1, ddF_y = -2 * r, x = 0, y = r;
  auto plot = [&](int16_t px, int16_t py) {
    if (px >= 0 && px < 240 && py >= 0 && py < 240) {
      setWindow(px, py, px, py);
      writeData(color >> 8);
      writeData(color & 0xFF);
    }
  };
  plot(x0, y0 + r); plot(x0, y0 - r); plot(x0 + r, y0); plot(x0 - r, y0);
  while (x < y) {
    if (f >= 0) { y--; ddF_y += 2; f += ddF_y; }
    x++; ddF_x += 2; f += ddF_x;
    plot(x0 + x, y0 + y); plot(x0 - x, y0 + y);
    plot(x0 + x, y0 - y); plot(x0 - x, y0 - y);
    plot(x0 + y, y0 + x); plot(x0 - y, y0 + x);
    plot(x0 + y, y0 - x); plot(x0 - y, y0 - x);
  }
}

void gc9a01Init() {
  pinMode(TFT_CS, OUTPUT);
  pinMode(TFT_DC, OUTPUT);
  pinMode(TFT_RST, OUTPUT);
  digitalWrite(TFT_CS, HIGH);

  digitalWrite(TFT_RST, HIGH);
  delay(10);
  digitalWrite(TFT_RST, LOW);
  delay(20);
  digitalWrite(TFT_RST, HIGH);
  delay(120);

  SPI.begin();
  SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));

  writeCommand(0xEF);
  writeCommand(0xEB); writeData(0x14);
  writeCommand(0xFE);
  writeCommand(0xEF);
  writeCommand(0xEB); writeData(0x14);
  writeCommand(0x84); writeData(0x40);
  writeCommand(0x85); writeData(0xFF);
  writeCommand(0x86); writeData(0xFF);
  writeCommand(0x87); writeData(0xFF);
  writeCommand(0x88); writeData(0x0A);
  writeCommand(0x89); writeData(0x21);
  writeCommand(0x8A); writeData(0x00);
  writeCommand(0x8B); writeData(0x80);
  writeCommand(0x8C); writeData(0x01);
  writeCommand(0x8D); writeData(0x01);
  writeCommand(0x8E); writeData(0xFF);
  writeCommand(0x8F); writeData(0xFF);
  writeCommand(0xB6); writeData(0x00); writeData(0x00);
  writeCommand(0x3A); writeData(0x05);
  writeCommand(0x90); writeData(0x08); writeData(0x08); writeData(0x08); writeData(0x08);
  writeCommand(0xBD); writeData(0x06);
  writeCommand(0xBC); writeData(0x00);
  writeCommand(0xFF); writeData(0x60); writeData(0x01); writeData(0x04);
  writeCommand(0xC3); writeData(0x13);
  writeCommand(0xC4); writeData(0x13);
  writeCommand(0xC9); writeData(0x22);
  writeCommand(0xBE); writeData(0x11);
  writeCommand(0xE1); writeData(0x10); writeData(0x0E);
  writeCommand(0xDF); writeData(0x21); writeData(0x0C); writeData(0x02);
  writeCommand(0xF0); writeData(0x45); writeData(0x09); writeData(0x08); writeData(0x08); writeData(0x26); writeData(0x2A);
  writeCommand(0xF1); writeData(0x43); writeData(0x70); writeData(0x72); writeData(0x36); writeData(0x37); writeData(0x6F);
  writeCommand(0xF2); writeData(0x45); writeData(0x09); writeData(0x08); writeData(0x08); writeData(0x26); writeData(0x2A);
  writeCommand(0xF3); writeData(0x43); writeData(0x70); writeData(0x72); writeData(0x36); writeData(0x37); writeData(0x6F);
  writeCommand(0xED); writeData(0x1B); writeData(0x0B);
  writeCommand(0xAE); writeData(0x77);
  writeCommand(0xCD); writeData(0x63);
  writeCommand(0x70); writeData(0x07); writeData(0x07); writeData(0x04); writeData(0x0E); writeData(0x0F); writeData(0x09); writeData(0x07); writeData(0x08); writeData(0x03);
  writeCommand(0xE8); writeData(0x34);
  writeCommand(0x62); writeData(0x18); writeData(0x0D); writeData(0x71); writeData(0xED); writeData(0x70); writeData(0x70); writeData(0x18); writeData(0x0F); writeData(0x71); writeData(0xEF); writeData(0x70); writeData(0x70);
  writeCommand(0x63); writeData(0x18); writeData(0x11); writeData(0x71); writeData(0xF1); writeData(0x70); writeData(0x70); writeData(0x18); writeData(0x13); writeData(0x71); writeData(0xF3); writeData(0x70); writeData(0x70);
  writeCommand(0x64); writeData(0x28); writeData(0x29); writeData(0xF1); writeData(0x01); writeData(0xF1); writeData(0x00); writeData(0x07);
  writeCommand(0x66); writeData(0x3C); writeData(0x00); writeData(0xCD); writeData(0x67); writeData(0x45); writeData(0x45); writeData(0x10); writeData(0x00); writeData(0x00); writeData(0x00);
  writeCommand(0x67); writeData(0x00); writeData(0x3C); writeData(0x00); writeData(0x00); writeData(0x00); writeData(0x01); writeData(0x54); writeData(0x10); writeData(0x32); writeData(0x98);
  writeCommand(0x74); writeData(0x10); writeData(0x85); writeData(0x80); writeData(0x00); writeData(0x00); writeData(0x4E); writeData(0x00);
  writeCommand(0x98); writeData(0x3E); writeData(0x07);
  writeCommand(0x35);
  writeCommand(0x21);
  writeCommand(0x11);
  delay(120);
  writeCommand(0x29);
  delay(20);
}

void setup() {
  Serial.begin(115200);
  Serial.println(F("GC9A01 Round LCD Initializing..."));
  gc9a01Init();
  fillScreen(COLOR_BLACK);

  // Draw fixed outer rings
  drawCircle(120, 120, 118, COLOR_CYAN);
  drawCircle(120, 120, 116, COLOR_CYAN);
  drawCircle(120, 120, 100, COLOR_WHITE);
  drawCircle(120, 120, 80, COLOR_BLUE);
  drawCircle(120, 120, 60, COLOR_YELLOW);
  Serial.println(F("Display ready!"));
}

void loop() {
  // Pulse inner target circle with different colors
  fillCircle(120, 120, 40, palette[colorIndex]);
  Serial.print(F("Color index: "));
  Serial.println(colorIndex);

  colorIndex = (colorIndex + 1) % 6;
  delay(800);
}

Toon alle codeMinder code

Wiring diagram and example code generated by Codey.online — https://www.codey.online

GC9A01 1.28" Ronde TFT LCD Demo

Dit project verbindt een 1.28-inch GC9A01 ronde TFT LCD via SPI met de ESP32. De sketch initialiseert het display en tekent een aangepaste ronde gauge-indeling met tekst en statusindicatoren die worden bijgewerkt.

Aansluitschema: 1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino op een ESP32 DevKit V1 — Aansluitschema · Klik om te vergroten

Aansluittabel: 1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino op een ESP32 DevKit V1 — Aansluittabel · Klik om te vergroten

GC9A01_1_28_Round_TFT_LCD_Demo.ino · gecompileerd en getest

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : GC9A01 1.28" Round TFT LCD Demo
 *  Board     : ESP32 DEVKIT V1 (esp32:esp32:esp32doit-devkit-v1)
 *  Parts     : 1.28" Round TFT LCD 240x240 (GC9A01, SPI)
 *  Libraries : Adafruit GFX Library 1.12.6, Adafruit GC9A01A 1.1.1
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_GC9A01A.h>

#define TFT_CS   5
#define TFT_DC   27
#define TFT_RST  4

Adafruit_GC9A01A tft(TFT_CS, TFT_DC, TFT_RST);

void drawDial() {
  tft.fillScreen(GC9A01A_BLACK);
  
  // Draw outer colored rings
  tft.drawCircle(120, 120, 118, GC9A01A_CYAN);
  tft.drawCircle(120, 120, 115, GC9A01A_BLUE);
  tft.fillCircle(120, 120, 90, GC9A01A_NAVY);
  tft.fillCircle(120, 120, 80, GC9A01A_BLACK);

  // Centered labels
  tft.setTextColor(GC9A01A_WHITE);
  tft.setTextSize(2);
  tft.setCursor(65, 80);
  tft.println("GC9A01");

  tft.setTextSize(1);
  tft.setTextColor(GC9A01A_GREEN);
  tft.setCursor(75, 105);
  tft.println("ESP32 READY");
}

void setup() {
  Serial.begin(115200);
  Serial.println("Initializing GC9A01 Round Display...");

  tft.begin();
  tft.setRotation(0);
  drawDial();
  Serial.println("Display initialized!");
}

void loop() {
  static unsigned long lastUpdate = 0;
  static int counter = 0;

  if (millis() - lastUpdate >= 1000) {
    lastUpdate = millis();
    counter++;

    // Update counter display in the center
    tft.fillRect(60, 130, 120, 30, GC9A01A_BLACK);
    tft.setTextColor(GC9A01A_YELLOW);
    tft.setTextSize(3);
    tft.setCursor(95, 135);
    tft.printf("%02d", counter % 60);

    Serial.print("Counter: ");
    Serial.println(counter % 60);
  }
}

Toon alle codeMinder code

Benodigde bibliotheken: Adafruit GFX Library 1.12.6, Adafruit GC9A01A 1.1.1

Wiring diagram and example code generated by Codey.online — https://www.codey.online

Pinafstand	2,54 mm, 8 pins
Schermformaat	1,28 inch rond
Resolutie	240×240 pixels
Display type	IPS kleurenscherm voor brede kijkhoeken
Driver chip	GC9A01
Interface	4-Pin SPI
Werkspanning	2,8V tot 3,3V
Werktemperatuur	-20℃ tot 70℃
Werkvochtigheid	5% tot 95% RH
Displaygebied	32,4 mm diameter
Paneelafmetingen	35,6 × 38,1 × 1,5 mm
PCB-afmetingen	44 × 36 × 5 mm

1,28″ rond TFT LCD 240×240 (GC9A01, SPI) voor Arduino

Aansluitschema en codevoorbeeld

1.28 Inch Ronde GC9A01 TFT LCD Demo

GC9A01 1.28" Ronde TFT LCD Demo