Displaying Custom Images on 0.96-Inch OLED Display Using NODE MCU

IPCS Global January 30, 2019

Displaying custom images on 0.96-inch OLED display using NODE MCU

Programming a 16X2 LCD is simpler compared to other graphic displays. But when it comes to displaying an image in your display 16X2 LCD fails. In order to overcome this, we can use 0.96-inch OLED. SSD1306 display (128×64) is a monochrome display which means it has only one color (blue in this example). The display itself is having a chip (SSD1306) which can communicate with other master devices using I2C or SPI protocols.in this example we are communicating with our display using SPI protocol which is faster than I2C. Pins used are as follows: SCK, SDA, CS (chip select: active low), D/C (data/command) and a rest pin (RST).

Adafruit Industries provides a library for the SSD1306 OLED, Install the library for SSD1306 OLED using Arduino library manager (Sketch —> Include Library —> Library Manager), or manually by downloading the zip file for the library from the following link and adding it to Arduino libraries folder (C:\Program Files\Arduino\libraries):

https://github.com/adafruit/Adafruit_SSD1306

Generating a hex file matrix from an image

Open LCDAssistant software and load a binary image of resolution 128 X 64 pixels.

Load our image File => Load image

Then save your output Fileà Save output

Connect SSD1306 display to your Node MCU as follows

MOSI D3

CLK D4

DC D1

CS D0

RESET D2

GND GND

VDD 3V3

Copy and paste the following code into Arduino ide

Program

#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#define OLED_MOSI D3

#define OLED_CLK D4

#define OLED_DC D1

#define OLED_CS D0

#define OLED_RESET D2

Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

#define NUMFLAKES 10

#define XPOS 0

#define YPOS 1

#define DELTAY 2

#define LOGO16_GLCD_HEIGHT 16

#define LOGO16_GLCD_WIDTH 16

const unsigned char PROGMEM bitmap[] =

{

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x03, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x0F, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x3F, 0x00, 0x40, 0x0F, 0xE0, 0x7F, 0xFF, 0xF0, 0x03, 0xFF, 0xFC, 0x02, 0x00, 0x02, 0x00,

0x00, 0x7C, 0x00, 0x00, 0x0F, 0xC0, 0x7F, 0xFF, 0xFC, 0x07, 0xFF, 0xFC, 0x1F, 0xFF, 0xFE, 0x00,

0x00, 0xF0, 0x00, 0x00, 0x0F, 0xC0, 0x7F, 0xFF, 0xFE, 0x0F, 0xFF, 0xFC, 0x1F, 0xFF, 0xFE, 0x00,

0x00, 0xE0, 0x08, 0x00, 0x0F, 0xC0, 0xFF, 0xFF, 0xFE, 0x0F, 0xFF, 0xFC, 0x1F, 0xFF, 0xFE, 0x00,

0x01, 0xC0, 0xFF, 0x80, 0x0F, 0xC1, 0xFF, 0xFF, 0xFE, 0x00, 0x00, 0x04, 0x1F, 0xFF, 0xFE, 0x00,

0x01, 0x83, 0xC0, 0x20, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,

0x03, 0x07, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,

0x03, 0x0C, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,

0x03, 0x0C, 0x0F, 0x80, 0x0F, 0xC0, 0x7F, 0xFF, 0xFE, 0x0F, 0xC0, 0x00, 0x1F, 0xFF, 0xF8, 0x00,

0x02, 0x10, 0x20, 0x00, 0x0F, 0xC0, 0x7F, 0xFF, 0xFE, 0x0F, 0xC0, 0x00, 0x1F, 0xFF, 0xFC, 0x00,

0x02, 0x10, 0x40, 0x00, 0x0F, 0xC0, 0x7F, 0xFF, 0xFC, 0x0F, 0xC0, 0x00, 0x1F, 0xFF, 0xFE, 0x00,

0x02, 0x10, 0x80, 0x00, 0x0F, 0xC0, 0x7F, 0xFF, 0xF8, 0x0F, 0xC0, 0x00, 0x0F, 0xFF, 0xFE, 0x00,

0x02, 0x01, 0x00, 0x00, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x01, 0xFE, 0x00,

0x02, 0x20, 0x01, 0x80, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0xFE, 0x00,

0x00, 0x00, 0x07, 0xE0, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0xFE, 0x00,

0x00, 0x00, 0x0F, 0xF0, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x00, 0x01, 0xFE, 0x00,

0x00, 0x00, 0x0F, 0xF0, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x0F, 0xFF, 0xFC, 0x1F, 0xFF, 0xFE, 0x00,

0x00, 0x00, 0x0F, 0xF0, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x07, 0xFF, 0xFC, 0x1F, 0xFF, 0xFE, 0x00,

0x00, 0x00, 0x07, 0xE0, 0x0F, 0xC0, 0x7F, 0x00, 0x00, 0x07, 0xFF, 0xFC, 0x1F, 0xFF, 0xFC, 0x00,

0x00, 0x00, 0x03, 0xC0, 0x0F, 0xE0, 0x7F, 0x00, 0x00, 0x01, 0xFF, 0xFC, 0x3F, 0xFF, 0xF8, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

};

#define SSD1306_LCDHEIGHT 64

#if (SSD1306_LCDHEIGHT != 64)

#error(“Height incorrect, please fix Adafruit_SSD1306.h!”);

#endif

void setup()

{

display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

display.clearDisplay();

}

void loop()

{

display.drawBitmap(0,0,bitmap,256,256, WHITE);

display.display();

delay(800);

display.clearDisplay();

delay(50);

}

Verify and upload the code into your node MCU. If you wish to display custom images change the hex value matrix with the one obtained from LCDAssitant application.

Sample output is shown below.

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Displaying Custom Images on 0.96-Inch OLED Display Using NODE MCU

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