Just recently I spotted various I2C OLED displays on sale at reasonable prices and fancied trying to connect these up one of my Espruino.
Being relatively small size, requiring only 2 connections SDA and SCL from the Espruino but still having good text and graphical capabilities I snapped a couple up cheaply on the net. Here is a picture of the OLED display I bought, these are common on many sites at the moment.
If you want to learn more about OLED technology I recommend you read – https://en.wikipedia.org/wiki/OLED
Connecting the OLED display proved straightforward enough as the display can take standard 3v3 and GND and as its an I2C device on my Espruino I hooked up B7 and B6 which are SDA and SCL respectively
Connection and Layout
| Pin Label | Espruino PIN | I2C Function | Notes |
|---|---|---|---|
| GND | Ground | Ground | 0V |
| VCC | 3v3 | Power | Regulated 3v3 supply. |
| SDA | B7 | SDA | Serial data in |
| SCL | B6 | SCL | I2C clock |
Here is a sample layout diagram
Code
[codesyntax lang=”javascript”]
require("SSD1306");
function start(){
//10px
g.setFontVector(10);
// write some text
g.drawString("Hello",0,0);
// write to the screen
g.setFontVector(20);
g.drawString("World",0,10);
g.flip();
}
// I2C
I2C1.setup({scl:B6,sda:B7});
var g = require("SSD1306").connect(I2C1, start);
[/codesyntax]
Links
0.96 Inch White SPI OLED Display Module 12864 LED For Arduino 2.7 x 2.8cm Resolution 128 x 64
1.3 inch oled white display with 4PIN 4-SPI(default)/I2C Drive IC SH1106