progress_bar

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

// 0x1306.dev · animation: progress_bar · 8 frames · 125ms
#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 8
#define FRAME_DELAY 125

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

  // --- progress bar ---
  display.drawRect(14, 24, 100, 16, WHITE);
  display.fillRect(16, 26, (frame * 100) / 7 - 4, 12, WHITE);
  
  display.setCursor(54, 45);
  display.print(String((frame * 100) / 7) + "%");

  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);
  }
}