Arduino + SSD1306 OLED Displays DEMO program

• The screen used is 1.3 inch OLED screen
• Development board is Nodemcu
• Development environment is Arduino IDE

code

/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 by ThingPulse, Daniel Eichhorn
 * Copyright (c) 2018 by Fabrice Weinberg
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * ThingPulse invests considerable time and money to develop these open source libraries.
 * Please support us by buying our products (and not the clones) from
 * https://thingpulse.com
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 */
 
// Include the correct display library

// For a connection via I2C using the Arduino Wire include:
#include <Wire.h>               // Only needed for Arduino 1.6.5 and earlier
//#include "SSD1306Wire.h"        // legacy: #include "SSD1306.h"
 #include "SH1106Wire.h"   // legacy: #include "SH1106.h"
// # include "ssd1306wire.h" //0.96 inch with this



// Optionally include custom images
#include "images.h"
#if defined(ESP8266)    // OLED pin definition
const int SDA_PIN = D2; / / Correspond to NodeMCU D5 or D1, Wemosd1mini D2
const int SCL_PIN = D1; // Corresponding NodeMCU D6 or D2, Wemosd1mini D5
#else
const int SDA_PIN = D1; / / Corresponding NodeMCU connected D5 or D1
const int SCL = D2;     // Corresponding NodeMCU connected D6 or D2
#endif

const int I2C_DISPLAY_ADDRESS = 0x3c;                      // i2c address default

SH1106Wire display(I2C_DISPLAY_ADDRESS, SDA_PIN, SCL_PIN); // 1.3 inch with this
// SSD1306Wire Display (i2c_display_address, sda_pin, scl_pin); // 0.96 inch with this
#define DEMO_DURATION 3000

typedef void (*Demo)(void);

int demoMode = 0;
int counter = 1;

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.println();


  // Initialising the UI will init the display too.
  display.init();

 // display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);

}

void drawFontFaceDemo() {
    // Font Demo1
    // create more fonts at http://oleddisplay.squix.ch/
    display.setTextAlignment(TEXT_ALIGN_LEFT);
    display.setFont(ArialMT_Plain_10);
    display.drawString(0, 0, "Hello world");
    display.setFont(ArialMT_Plain_16);
    display.drawString(0, 10, "Hello world");
    display.setFont(ArialMT_Plain_24);
    display.drawString(0, 26, "Hello world");
}

void drawTextFlowDemo() {
    display.setFont(ArialMT_Plain_10);
    display.setTextAlignment(TEXT_ALIGN_LEFT);
    display.drawStringMaxWidth(0, 0, 128,
      "Lorem ipsum\n dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore." );
}

void drawTextAlignmentDemo() {
    // Text alignment demo
  display.setFont(ArialMT_Plain_10);

  // The coordinates define the left starting point of the text
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.drawString(0, 10, "Left aligned (0,10)");

  // The coordinates define the center of the text
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.drawString(64, 22, "Center aligned (64,22)");

  // The coordinates define the right end of the text
  display.setTextAlignment(TEXT_ALIGN_RIGHT);
  display.drawString(128, 33, "Right aligned (128,33)");
}

void drawRectDemo() {
      // Draw a pixel at given position
    for (int i = 0; i < 10; i++) {
      display.setPixel(i, i);
      display.setPixel(10 - i, i);
    }
    display.drawRect(12, 12, 20, 20);

    // Fill the rectangle
    display.fillRect(14, 14, 17, 17);

    // Draw a line horizontally
    display.drawHorizontalLine(0, 40, 20);

    // Draw a line horizontally
    display.drawVerticalLine(40, 0, 20);
}

void drawCircleDemo() {
  for (int i=1; i < 8; i++) {
    display.setColor(WHITE);
    display.drawCircle(32, 32, i*3);
    if (i % 2 == 0) {
      display.setColor(BLACK);
    }
    display.fillCircle(96, 32, 32 - i* 3);
  }
}

void drawProgressBarDemo() {
  int progress = (counter / 5) % 100;
  // draw the progress bar
  display.drawProgressBar(0, 32, 120, 10, progress);

  // draw the percentage as String
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.drawString(64, 15, String(progress) + "%");
}

void drawImageDemo() {
    // see http://blog.squix.org/2015/05/esp8266-nodemcu-how-to-create-xbm.html
    // on how to create xbm files
    display.drawXbm(34, 14, WiFi_Logo_width, WiFi_Logo_height, WiFi_Logo_bits);
}

Demo demos[] = {drawFontFaceDemo, drawTextFlowDemo, drawTextAlignmentDemo, drawRectDemo, drawCircleDemo, drawProgressBarDemo, drawImageDemo};
int demoLength = (sizeof(demos) / sizeof(Demo));
long timeSinceLastModeSwitch = 0;

void loop() {
  // clear the display
  display.clear();
  // draw the current demo method
  demos[demoMode]();

  display.setTextAlignment(TEXT_ALIGN_RIGHT);
  display.drawString(64, 0, String(millis()));
  // write the buffer to the display
  display.display();

  if (millis() - timeSinceLastModeSwitch > DEMO_DURATION) {
    demoMode = (demoMode + 1)  % demoLength;
    timeSinceLastModeSwitch = millis();
  }
  counter++;
  delay(10);
}