happy_face

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

// 0x1306.dev · animation: happy_face · 4 frames · 100ms
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

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

#define FRAME_COUNT 4
#define FRAME_DELAY 100

void drawFrame(int frame) {
  display.clearDisplay();

  int cx = 64;
  int cy = 32;
  // --- face outlines ---
  display.drawCircle(cx, cy, 26, WHITE);

  // --- eyes --- draw AFTER face, BEFORE smile mask ---
  if (frame == 3) { // blink
    display.drawFastHLine(cx - 13, cy - 8, 9, WHITE);
    display.drawFastHLine(cx + 4, cy - 8, 9, WHITE);
  } else { // open
    display.fillRect(cx - 13, cy - 11, 6, 6, WHITE);
    display.fillRect(cx + 7, cy - 11, 6, 6, WHITE);
  }

  // --- smile --- bottom arc 200 to 340 degrees ---
  for (int a = 200; a < 340; a += 8) {
    float rad = a * 0.0174533;
    int x = cx + 15 * cos(rad);
    int y = cy + 15 * sin(rad);
    display.drawPixel(x, y, WHITE);
  }

  display.display();
}

void setup() {
  Wire.begin(21, 22); // SDA=21, SCL=22 for ESP32 DevKit // change to 0x3D if display not found
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  display.clearDisplay();
  display.display();
}

void loop() {
  for (int i = 0; i < FRAME_COUNT; i++) {
    drawFrame(i);
    delay(FRAME_DELAY);
  }
}