OLED Marquee rev_01

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    - Project: OLED Marquee
    - Source Code NOT compiled for: Arduino Nano
    - Source Code created on: 2025-10-11 15:38:26

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* 我想要用ESP32微控制器加上OLED螢幕的Arduino程式碼，並且要在螢幕上產生修平科技大學智慧 */
    /* 車輛系的字樣，並且加上跑馬燈，然後請提前幫排除問題1.避免程式碼生成後螢幕出現白點亂碼2.避免少字體 */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

/****** DEFINITIONS *****/
#ifndef SCREEN_WIDTH
#define SCREEN_WIDTH 128
#endif
#ifndef SCREEN_HEIGHT
#define SCREEN_HEIGHT 64
#endif
#define OLED_RESET -1
#define OLED_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Marquee text (ASCII fallback for reliable rendering)
static const char marqueeText[] = "Xiping Tech Univ Smart Vehicle Dept  ";
static int marqueeX = 0;
static unsigned long lastMarqueeUpdate = 0;
static const unsigned long MARQUEE_DELAY = 70; // adjust speed (ms)

void setup() {
  // Initialize I2C and OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
    // Try alternative address commonly used by some modules
    if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) {
      // If still failing, loop forever
      for(;;);
    }
  }
  // prevent white dots by turning off charge pump briefly during init
  display.clearDisplay();
  display.display();

  // Optional small welcome sequence
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("Initializing OLED...");
  display.display();
  delay(800);

  // Show a simple, reliable heading (ASCII fallback)
  display.clearDisplay();
  display.setCursor(0, 0);
  display.setTextSize(1);
  display.println("Xiping Tech Univ");
  display.println("Smart Vehicle Dept");
  display.display();
  delay(1200);
  // Clear to start marquee
  display.clearDisplay();
  display.display();
}

void loop() {
  unsigned long now = millis();
  if(now - lastMarqueeUpdate >= MARQUEE_DELAY) {
    lastMarqueeUpdate = now;

    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);

    // Marquee: draw text with horizontal offset
    int y = 28;
    display.setCursor(-marqueeX, y);
    display.print(marqueeText);
    display.display();

    // Update offset
    marqueeX++;
    int textW;
    int16_t x1, y1;
    uint16_t wText, hText;
    // Measure text width
    display.getTextBounds(marqueeText, 0, y, &x1, &y1, &wText, &hText);
    textW = (int)wText;
    if(marqueeX > textW) marqueeX = 0;
  }
}

/* END CODE */