sad_face

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

// 0x1306.dev · animation: sad_face · 4 frames · 200ms
#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 200

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

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

  // --- eyes --- small filled squares ---
  display.fillRect(cx - 13, cy - 11, 6, 6, WHITE);
  display.fillRect(cx + 7, cy - 11, 6, 6, WHITE);

  // --- frown --- shifted down ---
  for (int a = 20; a <= 161; a += 8) {
    float rad = a * 0.0174533;
    int x = cx + 13 * cos(rad);
    int y = cy + 6 + 8 * sin(rad);  // +6 pushes it into lower half
    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);
  }
}