Arduino下使用SSD1306驱动的OLED

---

首先下载SSD1306的库到Arduino，有两种方式，任选其一：

1.在Github下载开源库 Adafruit_SSD1306 https://github.com/adafruit/Adafruit_SSD1306，下载解压后放到Arduino的库文件夹即可。

2.直接使用Arduino IDE下载 Adafruit_SSD1306库（推荐用这个方法安装类库）。

打开Tools菜单里的Mnge Libraries选项。 搜索ssd1306关键词，安装下面选中的这个Adafruit_SSD1306库（点击Install按钮进行安装） 安装时提示是否安装一些其它相关库，点击Install all按钮，全部安装。 安装好后重启一下Arduino IDE, 打开Adafruit_SSD1306库自带的示例代码

把示例代码上传到Arduino，下面连一下OLED的线。

OLED有4根引脚，分别为VCC,GND,SCL,SDA，以ARDUINO UNO为例，OLED的VCC引脚接5V引脚，GND随便接到一个GND引脚，SCL和SDA可以接到A4\A5或者PC5和PC4引脚。 接好线以后，重启ARDUINO，OLED开始显示图形测试内容。

---

Adafruit_SSD1306库的示例代码中包含了图形文字以及动画的代码，写的很清楚。接下来，新建一个空的工程，引用库，显示一串文字试试。

#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 32 // 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);

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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  } 

  // Clear the buffer 这里如果不清理buffer，默认的显示内容为Adafruit类库的LOGO
  display.clearDisplay();

  ShowText();
}

void loop() {
  // put your main code here, to run repeatedly:

} 

void ShowText(void) {
  display.clearDisplay();

  display.setTextSize(2); // Draw 2X-scale text 2倍字体
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10, 10); //显示的坐标位置
  display.println(F("Happy day"));
  display.display();      // Show text
}

---

虽然Adafruit_SSD1306这个库功能很强大，但是显示中文不是很方便，需要先用软件把文字转换成点位数据，当图片来显示。

先下载取模软件PCtoLCD2002，打开后先配置如下。
然后输入汉字内容，点击生成字模按钮。转换好的输入会显示在下面。复制到代码中定义成数组。

下面写段简单的测试代码，显示一行中文。

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

// 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);

static const unsigned char PROGMEM cnWord_shi[] = 
{
  0x02,0x20,0x12,0x20,0x12,0x20,0x12,0x20,0x12,0x20,0xFF,0xFE,0x12,0x20,0x12,0x20,
  0x12,0x20,0x12,0x20,0x13,0xE0,0x10,0x00,0x10,0x00,0x10,0x00,0x1F,0xFC,0x00,0x00,//世
};

static const unsigned char PROGMEM cnWord_jie[] = 
{  
  0x00,0x00,0x1F,0xF0,0x11,0x10,0x11,0x10,0x1F,0xF0,0x11,0x10,0x11,0x10,0x1F,0xF0,
  0x02,0x80,0x0C,0x60,0x34,0x58,0xC4,0x46,0x04,0x40,0x08,0x40,0x08,0x40,0x10,0x40,//界
};

static const unsigned char PROGMEM cnWord_jia[] = 
{
  0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x7C,0xFE,0x44,0x12,0x44,0x12,0x44,0x12,0x44,
  0x12,0x44,0x12,0x44,0x12,0x44,0x12,0x44,0x22,0x44,0x22,0x7C,0x4A,0x44,0x84,0x00,//加
};

static const unsigned char PROGMEM cnWord_you[] = 
{
  0x00,0x40,0x20,0x40,0x10,0x40,0x10,0x40,0x87,0xFC,0x44,0x44,0x44,0x44,0x14,0x44,
  0x14,0x44,0x27,0xFC,0xE4,0x44,0x24,0x44,0x24,0x44,0x24,0x44,0x27,0xFC,0x04,0x04,//油
};
  
 
  

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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  } 

  // Clear the buffer 这里如果不清理buffer，默认的显示内容为Adafruit类库的LOGO
  display.clearDisplay();
 
  ShowCnText();
}

void loop() {
  // put your main code here, to run repeatedly:

}


void ShowCnText()
{
//  display.clearDisplay(); // clears the screen and buffer
//  display.drawBitmap(10,10,cnWord_shi,16,16, 1);
//  display.display();

  display.clearDisplay();

  display.drawBitmap(10,10, cnWord_shi, 16,16, 1);
  display.drawBitmap(30,10, cnWord_jie, 16,16, 1);
  display.drawBitmap(50,10, cnWord_jia, 16,16, 1);
  display.drawBitmap(70,10, cnWord_you, 16,16, 1);
  
  display.display();
  delay(1000);
}

THE END