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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
//Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Adafruit_SSD1306 display(OLED_RESET);


void setup() {
 // Serial.begin(9600); 

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
   // Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
}
  void loop()
{ 
  for(int i=10;i>-1;i--)
{display.clearDisplay();          //清屏—清除缓存
display.setTextSize(2);          //字体大小为2
 display.setTextColor(WHITE);   //字体颜色为白色
 display.setCursor(60,10);         //从0行32列像素开始输出
  display.print(i);   
  display.print("s"); //输出大写字母ZJUT
 display.display();
 delay(900);}
}