Arduino Foundation Series - SSD1306

//#include <SPI.h>                                  //Not Needed if using I2c - SPI Driver for OLED
#include <Wire.h>                                 //I2C Driver
#include <Adafruit_GFX.h>                         //Graphics library
#include <Adafruit_SSD1306.h>                     //SSD1306 OLED Driver

#define OLED_RESET 4                              //Digital pin 4 set aside for OLED reset
Adafruit_SSD1306 display(OLED_RESET);             //We will call out OLED object display, but you can choose any name

int level = 0;                                    //INT variable for reading the pot on Analog 0





void setup() {                                    //SETUP - ONLY RUNS ONCE

  Serial.begin(9600);                             //Serial comms for debugging
  display.begin(SSD1306_SWITCHCAPVCC, 0x3c);      //start the oled called display with a a hex addy of 0x3c
  display.display();                              //Show what's in the buffer
  delay(2000);                                    //take a breath
  display.clearDisplay();                         //clear the screen
  pinMode(A0,INPUT);                              //tell the nano to look for an analog signal on pin A0

}

void loop() {                                     //MAIN LOOP - RUNS OVER & OVER


level = (analogRead(A0));                         //read the voltage on pin A0 and put the ADC value into variable level


  display.clearDisplay();                         //always start with a clear
  display.setTextSize(4);                         //set up text size
  display.setTextColor(WHITE);                    //set text color
  display.setCursor(10,10);                       //where to position cursor (128,64)
  display.clearDisplay();                         //another flush
  display.println(level);                         //add data in the buffer - the variable level
  display.display();                              //show the buffer
}