This guide shows how to wire an OLED display with ESP8266 NodeMCU. Using the Arduino IDE, we'll show you how to write text, set multiple fonts, create shapes, and display bitmap pictures.
Introducing 0.96 inch OLED Display
The SSD1306 model, a mono color, 0.96-inch display with 12864 pixels, is the OLED display that will be used in this tutorial, as shown in the following figure.
Because the OLED display does not require backlighting, it results in a very nice contrast in low-light conditions. Furthermore, since its pixels use energy only when they are turned on, the OLED display consumes less power than traditional displays.
The model we're using has four pins and uses the I2C communication standard to interface with any microcontroller. There are models that communicate using the SPI communication protocol or that come with an extra RESET pin.
OLED Display SSD1306 Pin Wiring
The wiring is very simple since the OLED display uses the I2C communication standard. You may refer to the following table as a guide:
| Pin | ESP8266 |
| Vin | 3.3V |
| GND | GND |
| SCL | GPIO 5 (D1) |
| SDA | GPIO 4 (D2) |
To wire the OLED display with ESP8266, you may instead follow the next schematic diagram.
We're using the I2C communication protocol in this example. The ESP8266's most suitable pins for I2C communication are GPIO 5 (SCL) and GPIO 4 (SDA).
Use the following GPIOs if you're using an OLED display with the SPI communication protocol:
- GPIO 14: CLK
- GPIO 12: MISO
- GPIO 13: MOSI
- GPIO 15: CS
Read our ESP8266 Pinout Guide to learn more about the ESP8266 GPIOs.
Installing SSD1306 OLED Library – ESP8266
To control the OLED display with ESP8266, numerous libraries are available. We'll be using two Adafruit libraries in this tutorial: the Adafruit_SSD1306 library and the Adafruit_GFX library.
To install such libraries, follow the next steps.
1. Open your Arduino IDE and go to Sketch > Include Library > Manage Libraries. The Library Manager should open.
![Arduino UNO R4 WiFi [ABX00087] - Renesas RA4M1 / ESP32-S3 - Wi-Fi, Bluetooth, USB-C, CAN, DAC, OP AMP, Qwiic Connector, 12x8 LED Matrix](https://m.media-amazon.com/images/I/416S910MpBL.jpg)
2. Type “SSD1306” in the search box and install the SSD1306 library from Adafruit.
3. After installing the Adafruit SSD1306 library, type “GFX” into the search box and install the library.
4. After installing the libraries, restart your Arduino IDE.
The ESP8266 will be programmed using the Arduino IDE, so you must have the ESP8266 add-on installed in your Arduino IDE. Follow the next tutorial if you haven't already:
Testing an OLED Display with ESP8266
You may use one example from the library to see whether everything is working correctly after wiring the OLED display to the ESP8266 and installing all required libraries.
Go to File > Examples > Adafruit SSD1306 in your Arduino IDE and select the example for the display you're using.
![Official Arduino Starter Kit [K000007] (English Projects Book) - 12 DIY Projects with All Necessary Electronic Components and Instructions - origianl kit by Arduino from Italy](https://m.media-amazon.com/images/I/51fPv6DsjQL.jpg)
The following code should load:
/*********
Complete project details at https://lededitpro.com
This is an example for our Monochrome OLEDs based on SSD1306 drivers. Pick one up today in the adafruit shop! ------> http://www.adafruit.com/category/63_98
This example is for a 128x32 pixel display using I2C to communicate 3 pins are required to interface (two I2C and one reset).
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries, with contributions from the open source community. BSD license, check license.txt for more information All text above, and the splash screen below must be included in any redistribution.
*********/
#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 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define NUMFLAKES 10 // Number of snowflakes in the animation example
#define LOGO_HEIGHT 16
#define LOGO_WIDTH 16
static const unsigned char PROGMEM logo_bmp[] =
{ B00000000, B11000000,
B00000001, B11000000,
B00000001, B11000000,
B00000011, B11100000,
B11110011, B11100000,
B11111110, B11111000,
B01111110, B11111111,
B00110011, B10011111,
B00011111, B11111100,
B00001101, B01110000,
B00011011, B10100000,
B00111111, B11100000,
B00111111, B11110000,
B01111100, B11110000,
B01110000, B01110000,
B00000000, B00110000 };
void setup() {
Serial.begin(115200);
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
// Show initial display buffer contents on the screen --
// the library initializes this with an Adafruit splash screen.
display.display();
delay(2000); // Pause for 2 seconds
// Clear the buffer
display.clearDisplay();
// Draw a single pixel in white
display.drawPixel(10, 10, WHITE);
// Show the display buffer on the screen. You MUST call display() after
// drawing commands to make them visible on screen!
display.display();
delay(2000);
// display.display() is NOT necessary after every single drawing command,
// unless that's what you want...rather, you can batch up a bunch of
// drawing operations and then update the screen all at once by calling
// display.display(). These examples demonstrate both approaches...
testdrawline(); // Draw many lines
testdrawrect(); // Draw rectangles (outlines)
testfillrect(); // Draw rectangles (filled)
testdrawcircle(); // Draw circles (outlines)
testfillcircle(); // Draw circles (filled)
testdrawroundrect(); // Draw rounded rectangles (outlines)
testfillroundrect(); // Draw rounded rectangles (filled)
testdrawtriangle(); // Draw triangles (outlines)
testfilltriangle(); // Draw triangles (filled)
testdrawchar(); // Draw characters of the default font
testdrawstyles(); // Draw 'stylized' characters
testscrolltext(); // Draw scrolling text
testdrawbitmap(); // Draw a small bitmap image
// Invert and restore display, pausing in-between
display.invertDisplay(true);
delay(1000);
display.invertDisplay(false);
delay(1000);
testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps
}
void loop() {
}
void testdrawline() {
int16_t i;
display.clearDisplay(); // Clear display buffer
for(i=0; i<display.width(); i+=4) {
display.drawLine(0, 0, i, display.height()-1, WHITE);
display.display(); // Update screen with each newly-drawn line
delay(1);
}
for(i=0; i<display.height(); i+=4) {
display.drawLine(0, 0, display.width()-1, i, WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for(i=0; i<display.width(); i+=4) {
display.drawLine(0, display.height()-1, i, 0, WHITE);
display.display();
delay(1);
}
for(i=display.height()-1; i>=0; i-=4) {
display.drawLine(0, display.height()-1, display.width()-1, i, WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for(i=display.width()-1; i>=0; i-=4) {
display.drawLine(display.width()-1, display.height()-1, i, 0, WHITE);
display.display();
delay(1);
}
for(i=display.height()-1; i>=0; i-=4) {
display.drawLine(display.width()-1, display.height()-1, 0, i, WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for(i=0; i<display.height(); i+=4) {
display.drawLine(display.width()-1, 0, 0, i, WHITE);
display.display();
delay(1);
}
for(i=0; i<display.width(); i+=4) {
display.drawLine(display.width()-1, 0, i, display.height()-1, WHITE);
display.display();
delay(1);
}
delay(2000); // Pause for 2 seconds
}
void testdrawrect(void) {
display.clearDisplay();
for(int16_t i=0; i<display.height()/2; i+=2) {
display.drawRect(i, i, display.width()-2*i, display.height()-2*i, WHITE);
display.display(); // Update screen with each newly-drawn rectangle
delay(1);
}
delay(2000);
}
void testfillrect(void) {
display.clearDisplay();
for(int16_t i=0; i<display.height()/2; i+=3) {
// The INVERSE color is used so rectangles alternate white/black
display.fillRect(i, i, display.width()-i*2, display.height()-i*2, INVERSE);
display.display(); // Update screen with each newly-drawn rectangle
delay(1);
}
delay(2000);
}
void testdrawcircle(void) {
display.clearDisplay();
for(int16_t i=0; i<max(display.width(),display.height())/2; i+=2) {
display.drawCircle(display.width()/2, display.height()/2, i, WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfillcircle(void) {
display.clearDisplay();
for(int16_t i=max(display.width(),display.height())/2; i>0; i-=3) {
// The INVERSE color is used so circles alternate white/black
display.fillCircle(display.width() / 2, display.height() / 2, i, INVERSE);
display.display(); // Update screen with each newly-drawn circle
delay(1);
}
delay(2000);
}
void testdrawroundrect(void) {
display.clearDisplay();
for(int16_t i=0; i<display.height()/2-2; i+=2) {
display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i,
display.height()/4, WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfillroundrect(void) {
display.clearDisplay();
for(int16_t i=0; i<display.height()/2-2; i+=2) {
// The INVERSE color is used so round-rects alternate white/black
display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i,
display.height()/4, INVERSE);
display.display();
delay(1);
}
delay(2000);
}
void testdrawtriangle(void) {
display.clearDisplay();
for(int16_t i=0; i<max(display.width(),display.height())/2; i+=5) {
display.drawTriangle(
display.width()/2 , display.height()/2-i,
display.width()/2-i, display.height()/2+i,
display.width()/2+i, display.height()/2+i, WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfilltriangle(void) {
display.clearDisplay();
for(int16_t i=max(display.width(),display.height())/2; i>0; i-=5) {
// The INVERSE color is used so triangles alternate white/black
display.fillTriangle(
display.width()/2 , display.height()/2-i,
display.width()/2-i, display.height()/2+i,
display.width()/2+i, display.height()/2+i, INVERSE);
display.display();
delay(1);
}
delay(2000);
}
void testdrawchar(void) {
display.clearDisplay();
display.setTextSize(1); // 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
// Not all the characters will fit on the display. This is normal.
// Library will draw what it can and the rest will be clipped.
for(int16_t i=0; i<256; i++) {
if(i == '\n') display.write(' ');
else display.write(i);
}
display.display();
delay(2000);
}
void testdrawstyles(void) {
display.clearDisplay();
display.setTextSize(1); // Normal 1:1 pixel scale
display.setTextColor(WHITE); // Draw white text
display.setCursor(0,0); // Start at top-left corner
display.println(F("Hello, world!"));
display.setTextColor(BLACK, WHITE); // Draw 'inverse' text
display.println(3.141592);
display.setTextSize(2); // Draw 2X-scale text
display.setTextColor(WHITE);
display.print(F("0x")); display.println(0xDEADBEEF, HEX);
display.display();
delay(2000);
}
void testscrolltext(void) {
display.clearDisplay();
display.setTextSize(2); // Draw 2X-scale text
display.setTextColor(WHITE);
display.setCursor(10, 0);
display.println(F("scroll"));
display.display(); // Show initial text
delay(100);
// Scroll in various directions, pausing in-between:
display.startscrollright(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrollleft(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrolldiagright(0x00, 0x07);
delay(2000);
display.startscrolldiagleft(0x00, 0x07);
delay(2000);
display.stopscroll();
delay(1000);
}
void testdrawbitmap(void) {
display.clearDisplay();
display.drawBitmap(
(display.width() - LOGO_WIDTH ) / 2,
(display.height() - LOGO_HEIGHT) / 2,
logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
display.display();
delay(1000);
}
#define XPOS 0 // Indexes into the 'icons' array in function below
#define YPOS 1
#define DELTAY 2
void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h) {
int8_t f, icons[NUMFLAKES][3];
// Initialize 'snowflake' positions
for(f=0; f< NUMFLAKES; f++) {
icons[f][XPOS] = random(1 - LOGO_WIDTH, display.width());
icons[f][YPOS] = -LOGO_HEIGHT;
icons[f][DELTAY] = random(1, 6);
Serial.print(F("x: "));
Serial.print(icons[f][XPOS], DEC);
Serial.print(F(" y: "));
Serial.print(icons[f][YPOS], DEC);
Serial.print(F(" dy: "));
Serial.println(icons[f][DELTAY], DEC);
}
for(;;) { // Loop forever...
display.clearDisplay(); // Clear the display buffer
// Draw each snowflake:
for(f=0; f< NUMFLAKES; f++) {
display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, WHITE);
}
display.display(); // Show the display buffer on the screen
delay(200); // Pause for 1/10 second
// Then update coordinates of each flake...
for(f=0; f< NUMFLAKES; f++) {
icons[f][YPOS] += icons[f][DELTAY];
// If snowflake is off the bottom of the screen...
if (icons[f][YPOS] >= display.height()) {
// Reinitialize to a random position, just off the top
icons[f][XPOS] = random(1 - LOGO_WIDTH, display.width());
icons[f][YPOS] = -LOGO_HEIGHT;
icons[f][DELTAY] = random(1, 6);
}
}
}
}If your OLED lacks a RESET pin, set the OLED_RESET variable to -1, as shown below:
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Note: If your OLED includes a RESET pin, connect it to a GPIO other than GPIO 4, since that pin is used for I2C communication in the EPS8266.
Install the code on your ESP8266 board. Do not forget to select the right board and COM port in the Tools menu.
As shown in the following short video, you should see a series of different animations on the OLED.
If your OLED display is not showing anything:
- Check that the OLED display is properly wired to the ESP8266.
- Double-check the OLED display's I2C address: With the OLED connected to the ESP8266, upload this code and check the I2C address in the Serial Monitor
If necessary, change the OLED address in the following line. The address in our case is 0x3C.
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { Write Text – OLED Display
The Adafruit library for OLED displays comes with several functions to write text. You'll learn how to write and scroll text using the library functions in this section.
“Hello, world!” OLED Display
The following sketch displays Hello, World! message on the OLED display.
/*********
LEDEdit PRO
Complete project details at https://lededitpro.com
*********/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 10);
// Display static text
display.println("Hello, world!");
display.display();
}
void loop() {
}After uploading the code, this is what you’ll get in your OLED:
Let’s take a quick look at how the code works.
Importing libraries
First, you'll need to import the necessary libraries. To write to the display, use the Wire library and the Adafruit libraries Adafruit_GFX and Adafruit_SSD1306.
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>Initialize the OLED display
The width and height of your OLED are then specified. We're using a 12864 OLED panel in this example. If you're using different sizes, you may adjust them using the SCREEN_WIDTH and SCREEN_HEIGHT variables.
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixelsThen, using the I2C communication protocol ( &Wire ), initialize a display object with the width and height defined earlier.
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);The (-1) parameter indicates that your OLED display lacks a RESET pin. If your OLED display has a RESET pin, you should connect it to a GPIO. In such a situation, the GPIO number should be given as a parameter.
Initialize the Serial Monitor to 115200 baud route in setup() for debugging.
Serial.begin(115200);Initialize the OLED display with the begin() a method as follows:
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("SSD1306 allocation failed");
for(;;); // Don't proceed, loop forever
}This snippet also prints a message on the Serial Monitor, in case we’re not able to connect to the display.
Serial.println("SSD1306 allocation failed");If you’re using a different OLED display, you may need to change the OLED address. In our case, the address is 0x3C.
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { If this address doesn’t work, you can run an I2C scanner sketch to find your OLED address. You can find the I2C scanner sketch here.
To give the OLED enough time to initialize before writing text, add a two-second delay after initializing the display:
delay(2000);Clear display, set font size, color, and write text
After initializing the display, clear the display buffer with the clearDisplay() method:
display.clearDisplay();Before writing text, you need to set the text size, color, and where the text will be displayed in the OLED.
Set the font size using the setTextSize() method:
display.setTextSize(1); Set the font color with the setTextColor() method:
display.setTextColor(WHITE); WHITE sets the white font and black background.
Using the setCursor(x,y) function, define the position at which the text starts. We're setting the text to start at (0,10) in this example.
display.setCursor(0,10); Finally, you can send the text to the display using the println() method, as follows:
display.println("Hello, world!");Then, you need to call the display() method to actually display the text on the screen.
display.display();Scrolling Text
The Adafruit OLED library provides useful methods to easily scroll text.
startscrollright(0x00, 0x0F): scroll text from left to rightstartscrollleft(0x00, 0x0F): scroll text from right to leftstartscrolldiagright(0x00, 0x07): scroll text from left bottom corner to right upper cornerstartscrolldiagleft(0x00, 0x07): scroll text from right bottom corner to left upper corner
The following sketch implements those methods.
/*********
LEDEdit PRO
Complete project details at https://lededitpro.com
*********/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 0);
// Display static text
display.println("Scrolling Hello");
display.display();
delay(100);
}
void loop() {
// Scroll in various directions, pausing in-between:
display.startscrollright(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrollleft(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrolldiagright(0x00, 0x07);
delay(2000);
display.startscrolldiagleft(0x00, 0x07);
delay(2000);
display.stopscroll();
delay(1000);
}The text scrolls as shown in the following short video.
Using Other Fonts – OLED Display
The Adafruit GFX library allows us to use fonts other than the built-in fonts. It allows you to choose between Serif, Sans, and Mono fonts. Each font comes in bold, italic, and different sizes.
In the actual font, the sizes are set. As a result, the setTextSize() method will not work with these fonts. The fonts are available in 9, 12, 18, and 24 point sizes, as well as seven-bit characters (ASCII codes) (specified as 7b in the font name).
You can choose from the next selection of fonts:
FreeMono12pt7b.h FreeSansBoldOblique12pt7b.h
FreeMono18pt7b.h FreeSansBoldOblique18pt7b.h
FreeMono24pt7b.h FreeSansBoldOblique24pt7b.h
FreeMono9pt7b.h FreeSansBoldOblique9pt7b.h
FreeMonoBold12pt7b.h FreeSansOblique12pt7b.h
FreeMonoBold18pt7b.h FreeSansOblique18pt7b.h
FreeMonoBold24pt7b.h FreeSansOblique24pt7b.h
FreeMonoBold9pt7b.h FreeSansOblique9pt7b.h
FreeMonoBoldOblique12pt7b.h FreeSerif12pt7b.h
FreeMonoBoldOblique18pt7b.h FreeSerif18pt7b.h
FreeMonoBoldOblique24pt7b.h FreeSerif24pt7b.h
FreeMonoBoldOblique9pt7b.h FreeSerif9pt7b.h
FreeMonoOblique12pt7b.h FreeSerifBold12pt7b.h
FreeMonoOblique18pt7b.h FreeSerifBold18pt7b.h
FreeMonoOblique24pt7b.h FreeSerifBold24pt7b.h
FreeMonoOblique9pt7b.h FreeSerifBold9pt7b.h
FreeSans12pt7b.h FreeSerifBoldItalic12pt7b.h
FreeSans18pt7b.h FreeSerifBoldItalic18pt7b.h
FreeSans24pt7b.h FreeSerifBoldItalic24pt7b.h
FreeSans9pt7b.h FreeSerifBoldItalic9pt7b.h
FreeSansBold12pt7b.h FreeSerifItalic12pt7b.h
FreeSansBold18pt7b.h FreeSerifItalic18pt7b.h
FreeSansBold24pt7b.h FreeSerifItalic24pt7b.h
FreeSansBold9pt7b.h FreeSerifItalic9pt7b.hThe fonts that work better with the OLED display are the 9 and 12 points size.
To use one of those fonts, first, you need to include it in your sketch. For example:
#include <Fonts/FreeSerif12pt7b.h>Next, you just need to use the setFont() method and pass as an argument the specified font:
display.setFont(&FreeSerif12pt7b);All methods to write text will use that font after specifying it. You only need to invoke the setFont() method with no parameters to return to using the original font.
display.setFont();Upload the next sketch to your board:
/*********
LEDEdit PRO
Complete project details at https://lededitpro.com
*********/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSerif9pt7b.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("SSD1306 allocation failed");
for(;;);
}
delay(2000);
display.setFont(&FreeSerif9pt7b);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,20);
display.println("Hello, world!");
display.display();
delay(2000);
}
void loop() {
}Now, your display prints the “Hello, world!” message in FreeSerif font.
Draw Shapes in the OLED Display
Adafruit's OLED library includes useful methods for drawing pixels, lines, and shapes. Let's take a quick look at those methods.
Draw a pixel
To draw a pixel on the OLED display, use the drawPixel(x, y, color) method, which takes as arguments the pixel's x and y coordinates as well as the color. As an example:
display.drawPixel(64, 32, WHITE);Draw a line
To create a line, use the drawLine(x1, y1, x2, y2, color) method. The (x1, y1) coordinates represent the start of the line, and the (x2, y2) coordinates represent the finish of the line. As an example:
display.drawLine(0, 0, 127, 20, WHITE);Draw a rectangle
The drawRect(x, y, width, height, color) function provides an easy way to draw a rectangle. The (x, y) coordinates indicate the top left corner of the rectangle. Then, you need to specify the width, height, and color:
display.drawRect(10, 10, 50, 30, WHITE);You can use fillRect(x, y, width, height, color) to draw a filled rectangle. This method accepts the same arguments as drawRect().
The library also includes drawRoundRect() and fillRoundRect() methods for displaying rectangles with round corners. These methods use the same arguments as the previous methods, plus the corner radius. As an example:
display.drawRoundRect(10, 10, 30, 50, 2, WHITE);
Or a filled round rectangle:
display.fillRoundRect(10, 10, 30, 50, 2, WHITE);
Draw a circle
To draw a circle, use the drawCircle(x, y, radius, color) method. The (x,y) coordinates indicate the center of the circle. You should also pass the radius as an argument. For example:
display.drawCircle(64, 32, 10, WHITE);In the same way, to build a filled circle, use the fillCircle() a method with the same arguments:
display.fillCircle(64, 32, 10, WHITE);
Draw a triangle
Use the drawTriangle(x1, y1, x2, y2, x3, y3, color) method to build a triangle. This method accepts as arguments the coordinates of each corner and the color.
display.drawTriangle(10, 10, 55, 20, 5, 40, WHITE);Use the fillTriangle() method to draw a filled triangle.
display.fillTriangle(10, 10, 55, 20, 5, 40, WHITE);
Invert
The invertDisplay() method is an extra method provided by the library that may be used with shapes or text. Pass true as a parameter to invert the screen colors, or false to return to the original colors.
If you call the following command after defining the triangle:
display.invertDisplay(true);You’ll get an inverted triangle as follows:
Code – Draw Shapes
Upload the following sketch, which goes through all of the shapes and implements each snippet of code we've covered previously.
/*********
LEDEdit PRO
Complete project details at https://lededitpro.com
*********/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000); // Pause for 2 seconds
// Clear the buffer
display.clearDisplay();
// Draw a single pixel in white
display.drawPixel(64, 32, WHITE);
display.display();
delay(3000);
// Draw line
display.clearDisplay();
display.drawLine(0, 0, 127, 20, WHITE);
display.display();
delay(3000);
// Draw rectangle
display.clearDisplay();
display.drawRect(30, 10, 50, 30, WHITE);
display.display();
delay(3000);
// Fill rectangle
display.fillRect(30, 10, 50, 30, WHITE);
display.display();
delay(3000);
// Draw round rectangle
display.clearDisplay();
display.drawRoundRect(10, 10, 30, 50, 2, WHITE);
display.display();
delay(3000);
// Fill round rectangle
display.clearDisplay();
display.fillRoundRect(10, 10, 30, 50, 2, WHITE);
display.display();
delay(3000);
// Draw circle
display.clearDisplay();
display.drawCircle(64, 32, 10, WHITE);
display.display();
delay(3000);
// Fill circle
display.fillCircle(64, 32, 10, WHITE);
display.display();
delay(3000);
// Draw triangle
display.clearDisplay();
display.drawTriangle(10, 10, 55, 20, 5, 40, WHITE);
display.display();
delay(3000);
// Fill triangle
display.fillTriangle(10, 10, 55, 20, 5, 40, WHITE);
display.display();
delay(3000);
// Invert and restore display, pausing in-between
display.invertDisplay(true);
delay(3000);
display.invertDisplay(false);
delay(3000);
}
void loop() {
}Display Bitmap Images in the OLED
The OLED display can display 12864 bitmap monocolor pictures.
To begin, resize a photo or picture in an imaging program and save it as a monochrome bitmap. You can use Paint if you have a Windows PC.
The image is then converted into an array using an Image to C Array converter. An LCD Image Converter was used.
Start the program with a new image and then exit. Select the bitmap image that you made earlier by going to Image > Import.
Go to Options > Conversion, and in the Prepare tab, select the following options:
- Type: Monochrome, Threshold Dither
- Main Scan Direction: Top to Bottom
- Line Scan Direction: Forward
Go to the Image tab and select the following options:
- Split to rows
- Block size: 8 bit
- Byte order: Little-Endian
Then click OK. Finally, go to File > Convert on the main menu. You should save a new file with the .c extension. That file contains the image's C array. Copy the array from that file using a text editor.
In our case, this is the array that we get:
static const uint8_t image_data_Saraarray[1024] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x14, 0x9e, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x36, 0x3f, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x6d, 0xff, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0xfb, 0xff, 0x80, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x03, 0xd7, 0xff, 0x80, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x07, 0xef, 0xff, 0x80, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x0f, 0xdf, 0xff, 0x90, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x0f, 0xbf, 0xff, 0xd0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x1d, 0x7f, 0xff, 0xd0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x01, 0x1b, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x02, 0xa7, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0xff, 0x80, 0x00, 0x0b, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x03, 0xff, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x07, 0xff, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0f, 0x07, 0xff, 0xf8, 0xf8, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0e, 0x01, 0xff, 0xc0, 0x38, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x1c, 0x46, 0xff, 0xb1, 0x18, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0x97, 0xff, 0xc0, 0x7a, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x01, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x01, 0xbf, 0xff, 0xff, 0xff, 0xfe, 0x81, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0xbf, 0xff, 0xff, 0xff, 0xfc, 0x81, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0xff, 0xff, 0xfe, 0xff, 0xfd, 0x83, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0xbf, 0xff, 0xfe, 0xff, 0xfd, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xfb, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x3f, 0xff, 0xdc, 0xff, 0xfa, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xd8, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xd0, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x90, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x02, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xb0, 0x00, 0x0f, 0xf5, 0xff, 0xd7, 0xf8, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xb0, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x5f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xa0, 0x00, 0x0f, 0xfb, 0xff, 0xff, 0xf0, 0x00, 0x3f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x0f, 0xfd, 0xff, 0xdf, 0xf0, 0x00, 0x3f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x07, 0xff, 0xff, 0xbf, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x07, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x87, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x03, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x43, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x60, 0x00, 0x01, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x73, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0xe0, 0x00, 0x00, 0xff, 0xff, 0xff, 0x80, 0x00, 0x7b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0xe0, 0x00, 0x00, 0x7f, 0xff, 0xfe, 0x00, 0x00, 0x33, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0xe0, 0x00, 0x00, 0x3f, 0xff, 0xf8, 0x00, 0x00, 0x27, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x0f, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x60, 0x00, 0x00, 0x67, 0xff, 0xe0, 0x00, 0x00, 0x1b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0x40, 0x00, 0x00, 0xf3, 0xff, 0xc4, 0x00, 0x00, 0x0b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0x80, 0x00, 0x00, 0xfc, 0xff, 0x8c, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0x3c, 0x3c, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x3f, 0xc0, 0x7c, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xfc, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff
};Copy your array into the sketch. Then, to display the array, use the drawBitmap() method that accepts the following arguments: (x, y, image array, image width, image height, rotation). The (x, y) coordinates define where the image starts to be displayed.
Copy the code below to display your bitmap image on the OLED.
/*********
LEDEdit PRO
Complete project details at https://lededitpro.com
*********/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
static const uint8_t image_data_Saraarray[1024] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x14, 0x9e, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x36, 0x3f, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x6d, 0xff, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0xfb, 0xff, 0x80, 0x1f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x03, 0xd7, 0xff, 0x80, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x07, 0xef, 0xff, 0x80, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x0f, 0xdf, 0xff, 0x90, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x0f, 0xbf, 0xff, 0xd0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x1d, 0x7f, 0xff, 0xd0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x01, 0x1b, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x02, 0xa7, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0xff, 0x80, 0x00, 0x0b, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x03, 0xff, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x07, 0xff, 0xff, 0xff, 0xf0, 0x0f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0f, 0x07, 0xff, 0xf8, 0xf8, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0e, 0x01, 0xff, 0xc0, 0x38, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x1c, 0x46, 0xff, 0xb1, 0x18, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0x97, 0xff, 0xc0, 0x7a, 0x07, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x01, 0x3f, 0xff, 0xff, 0xff, 0xfe, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0x01, 0xbf, 0xff, 0xff, 0xff, 0xfe, 0x81, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0xbf, 0xff, 0xff, 0xff, 0xfc, 0x81, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0xff, 0xff, 0xfe, 0xff, 0xfd, 0x83, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0xbf, 0xff, 0xfe, 0xff, 0xfd, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xfb, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x3f, 0xff, 0xdc, 0xff, 0xfa, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xd8, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x03, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xd0, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x90, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xf8, 0x02, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xb0, 0x00, 0x0f, 0xf5, 0xff, 0xd7, 0xf8, 0x01, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xb0, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x5f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xa0, 0x00, 0x0f, 0xfb, 0xff, 0xff, 0xf0, 0x00, 0x3f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x0f, 0xfd, 0xff, 0xdf, 0xf0, 0x00, 0x3f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x07, 0xff, 0xff, 0xbf, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x07, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x87, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x03, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x43, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x60, 0x00, 0x01, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x73, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0xe0, 0x00, 0x00, 0xff, 0xff, 0xff, 0x80, 0x00, 0x7b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0xe0, 0x00, 0x00, 0x7f, 0xff, 0xfe, 0x00, 0x00, 0x33, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0xe0, 0x00, 0x00, 0x3f, 0xff, 0xf8, 0x00, 0x00, 0x27, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x0f, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x60, 0x00, 0x00, 0x67, 0xff, 0xe0, 0x00, 0x00, 0x1b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfd, 0x40, 0x00, 0x00, 0xf3, 0xff, 0xc4, 0x00, 0x00, 0x0b, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0x80, 0x00, 0x00, 0xfc, 0xff, 0x8c, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0x3c, 0x3c, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x3f, 0xc0, 0x7c, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xfc, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff
};
void setup() {
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000); // Pause for 2 seconds
// Clear the buffer.
display.clearDisplay();
// Draw bitmap on the screen
display.drawBitmap(0, 0, image_data_Saraarray, 128, 64, 1);
display.display();
}
void loop() {
}After uploading the code, this is what we get on the display.
Troubleshooting
If you get the “SSD1306 allocation failed” error or the OLED is not displaying anything on the screen, it might be one of the following problems:
SDA and SCL are not connected properly
Please ensure that the SDA and SCL pins of the OLED display are appropriately wired. Connect the SDA pin to GPIO 4 (D2) and the SCL pin to GPIO 5 (D1) on the ESP8266.
Wrong I2C address
The OLED display we're using has an I2C address of 0x3C. Yours, on the other hand, may be different. As a result, be sure to check your display I2C address using an I2C scanner sketch.
Conclusion
We hope you’ve found this guide about the OLED display with EPS8266 useful. Now, you can integrate the OLED display into your own projects.
We hope you find this tutorial useful. Thanks for reading.
