/**
 * Fab Academy Week 4: Output Devices
 * Project: SSD1306 OLED Display Test
 * Board: Seeed Studio XIAO ESP32C3
 * Display: 0.96" OLED (128x64) via I2C
 */

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Screen dimensions in pixels
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The reset pin is not used on most 4-pin OLED modules (-1)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);

  // Initialize I2C communication
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  // 0x3C is the most common I2C address for these displays
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Clear the buffer
  display.clearDisplay();

  // Set text properties
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 20);     // Start at top-left corner (x=0, y=20)

  // Print the specific message
  display.println(F("Hello Fab Academy,"));
  display.setCursor(0, 40); 
  display.println(F("I am Sunny"));

  // Crucial: Push the buffer to the actual hardware display
  display.display(); 
  
  Serial.println("Display updated successfully.");
}

void loop() {
  // Static display, no action needed in loop
}