大家也知道，OLED規格相當多，常見的就有SSD1306和SH1106，LCD更不用說了，如果為了這些不同的顯示器去找對映的函式庫，有時還真的蠻累人的，而且還有ESP8266或ESP32支援的問題。
還好有u8g2函式庫，它算是u8glib的新版本，它對顯示器的支援超強大的！舉凡常見的OLED，像是SSD1306和SH1106，或是其它各種TFT LCD，都在它的支援範圍，真的是學一招就無敵了！
購買Arduino材料最佳選擇：https://www.jmaker.com.tw/
本篇先針對SSD1306和SH1106兩款OLED進行討論。
傑森習慣用I2C的OLED版本，所以線只有4條，很簡單！
先安裝u8g2函式庫，在程式管理員就能找到。
因為我們也要測試圖形的顯示，所以先準備一張圖。先在你熟悉的圖形軟體畫好圖，傑森是習慣用Photoshop，再到Image2LCD打開它。
Image2LCD下載網址：
http://www.e-paper-display.com/download_detail/downloadsId=625.html
先在繪圖軟體中畫好圖，存成JPG格式，在Image2LCD打開，基本上只有「輸出灰度」改成「單色」，寬度和高度設成128、64，然後就可以進行「保存」了。然後把得到的陣列COPY到我們的程式中即可。
有一點非常重要，如果這個圖是要給u8g2使用，一定要勾選「位元組內象素數據反序」這個選項哦！不然到時圖一定是破碎的。
傑森把程式精簡了一下，本範例主要是針對Arduino與SSD1306、SH1106，兩款OLED，整個程式只有一行不同。
SSD1306 0.96"：
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
SSD1306 0.91"：
U8G2_SSD1306_128X32_UNIVISION_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
SH1106：
U8G2_SH1106_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
程式中「logo_bmp」就是我們從Image2LCD輸出的圖形陣列。
u8g2.setFont(u8g2_font_HelvetiPixelOutline_te);
這行是設定字型，在u8g2裡，字形和大小是一起的，從字形清單中，你可以挑一個適合的字型和大小。字型從3像素高到92像素都有，不過有些只有數字，或是只有大寫英文，大家要注意一下。
完整字型清單請參考：
https://github.com/olikraus/u8g2/wiki/fntlistall
文字輸出很容易：
u8g2.drawStr(0,13,"Hello World !"); //x,y,文字。這裡的y是從文字的底部去算的哦！
至於圖形就更簡單，一行搞定！
u8g2.drawXBMP(0,16, imgWidth, imgHeight, logo_bmp); //x,y,寬度,高度,陣列名稱);
完整程式如下，大家可以參考看看，真的超簡單的哦！
#include <Arduino.h>
#include <U8g2lib.h>
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif
//U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ D2, /* data=*/ D1, /* reset=*/ U8X8_PIN_NONE); //NodeOLED用這行，或部份NodeMCU系列的板子也用這行
//U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ D2, /* data=*/ D1, /* reset=*/ U8X8_PIN_NONE); //ESP8266板子搭配SSD1306用這行
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); //Arduino搭配SSD1306(0.96" OLED)用這行
//U8G2_SH1106_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); //Arduino搭配SH1106(1.3" OLED)用這行
//U8G2_SSD1306_128X32_UNIVISION_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
//Arduino搭配SSD1306(0.91" OLED)用這行
#define imgWidth 128
#define imgHeight 48 //這裡只用到48的高度，因為上方要放文字
static const unsigned char PROGMEM logo_bmp[] =
{
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void setup(void) {
u8g2.begin();
}
void loop(void) {
u8g2.setFont(u8g2_font_HelvetiPixelOutline_te); //設定字型
u8g2.firstPage();
do {
u8g2.drawStr(0,13,"Hello World !"); //輸出文字
u8g2.drawXBMP(0,16, imgWidth, imgHeight, logo_bmp); //繪圖
} while ( u8g2.nextPage() );
//delay(1000);
}