#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 32 // OLED display height, in pixels

#define OLED_RESET     4 // Reset pin

#define SCREEN_ADDRESS 0x3C //0x3C for 128x32pixels OLED

Adafruit_SSD1306 display (SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {

  Serial.begin(9600);

  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

  {

    Serial.println(F("SSD1306 allocation failed"));

    for(;;); // Don't proceed, loop forever

  }

}

void loop() {

  text();

  display.invertDisplay(true);    

  delay(2000);

  display.invertDisplay(false);

  delay(2000);

}

void text(void) {

  display.clearDisplay();

  display.setTextSize(2);            

  display.setTextColor(SSD1306_WHITE);          // Draw white text

  display.setCursor(5,3);                       //setting cursor on X Y plane

  display.print(F("Welcome To ...RDL..."));

  display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text

  display.display();

  delay(2000);

}