Introduction to Arduino Nano driving OLED test (1) (soft IIC and hard IIC link SSD1306 screen)

Required preparation

hardware

One breadboard, Arduino Nano board, OLED screen of SSD1306 (I2C interface is used in this article), several wires

Library file

u8glib, U8g2 two libraries, if not, you can download them in CSDN.

Connection (hard IIC interface)

Arduino	YOU ARE
3V3	VCC
GND	GND
A5	SCL
A4	SDA

Connection (soft IIC interface)

If I2C needs to be shared, the library of U8g2 can support ordinary IO as I2C interface to drive OLED. In this article, D10 is used as SCL interface and D11 is used as SDA interface.

Arduino	YOU ARE
3V3	VCC
GND	GND
D10 (can be changed)	SCL
D11 (can be changed)	SDA

Hello word test

Based on u8glib (hard IIC interface)

In order to improve readability, irrelevant content has been deleted.

1. Add the library file, open the arduino program, execute the following figure 1, 2, and 3 to find the downloaded library file.
   
2. Execute the Demo program
   Open the Arduino program and execute 1, 2, 3, 4.
   
   If you want to continue the test and display the results, you can copy the following code to display three lines.

#include "U8glib.h"
/*I2C协议*/
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); 

void setup()
{
  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) 
    u8g.setColorIndex(255);     // white
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT )
    u8g.setColorIndex(3);         // max intensity
  else if ( u8g.getMode() == U8G_MODE_BW )
    u8g.setColorIndex(1);         // pixel on

  // u8g.setFont(u8g_font_unifont);
  Serial.begin(9600);

  u8g.setFont(u8g_font_osb18);   /*设置字体大小*/
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
}

void loop()
{
  u8g.firstPage();  
  do {
    u8g.drawStr(0,0,"hello world!");
    u8g.drawStr(0,20,"ha ha!");
    u8g.drawStr(20,40,"well done!");  /*设置起始位置*/
  } while( u8g.nextPage() );
  delay(500);
}

Based on U8g2 (soft IIC interface)

#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_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 10, /* data=*/ 11, /* reset=*/ U8X8_PIN_NONE);   // 设置D10做SCL，D11做SDA，可以改为其它接口
//U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE, /* clock=*/ 16, /* data=*/ 17);   // 如果要用硬IIC接口，可以用这句


void setup(void) {
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();					// clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr);	// 这里可以修改字体大小
  u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
  u8g2.sendBuffer();					// transfer internal memory to the display
  delay(1000);  
}

For more information, please refer to the relevant manual.