Adafruit_SSD1306 Library

Adafruit has the library Adafruit_SSD1306 Github for the OLED.

It provides examples to run the demo for SPI/I2C OLED.

Wiring

Arduino has the <wire.h> for the I2C communication link.

Board	I2C / TWI pins
Uno, Ethernet	A4 (SDA), A5 (SCL)
Mega2560	20 (SDA), 21 (SCL)
Leonardo	2 (SDA), 3 (SCL)
Due	20 (SDA), 21 (SCL), SDA1, SCL1

For the Arduino Uno, we need A4 for SDA(data line), and A5 for SCL(clock line).

And here is an example of I2C communication between 2 Arduino Uno board.

Test

Install library

Arduino -> Sketch -> Include Library -> Manage libraries:

Search for Adafruit GFX (Graphics library) and Adafruit SSD1306 (OLED library).

Run the demo

Demo Code for 128x64 I2C OLED.

The default I2C address is 0x3D, but my OLED is 0x3C. So change the following line to this:

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64

Hello 2019

static const unsigned char PROGMEM heart[] =
{ B00000000, B00000000,
  B00000000, B00000000,
  B00111100, B00111100,
  B01111110, B11111110,
  B11111111, B11111111,
  B11111111, B11111111,
  B01111111, B11111110,
  B00111111, B11111100,
  B00011111, B11111000,
  B00001111, B11110000,
  B00000111, B11100000,
  B00000011, B11000000,
  B00000001, B10000000,
  B00000000, B00000000,
  B00000000, B00000000,
  B00000000, B00000000};

void hello2019(void) {
  display.clearDisplay();
  display.setTextSize(2);      // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  
  display.println(F(" Bye 2018"));
  
  display.drawLine(0, 28, 43, 28, WHITE);
  display.drawLine(71, 28, 120, 28, WHITE);
  
  display.drawBitmap(
    50,
    20,
    heart, LOGO_WIDTH, LOGO_HEIGHT, 1);
  
  display.setCursor(0, 40);     // Start at top-left corner
  display.println(F("Hello 2019"));
  
    
  display.display();
}

bottle_cap