// example 2, Temperature to OLED
#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
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
String myString;

#include <OneWire.h> 
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 2 
OneWire oneWire(ONE_WIRE_BUS); 
DallasTemperature sensors(&oneWire);

void setup() 
{  
 sensors.begin(); 
 display.begin(SSD1306_SWITCHCAPVCC, 0x3C);// Address 0x3C for 128x64
 display.clearDisplay();
 display.display();
} 
void loop() 
{ 
   sensors.requestTemperatures(); // Send the command to get temperature readings  
   myString=String(sensors.getTempCByIndex(0));
   drawChar(myString+" oC"); 
} 

void drawChar(String str) {
  display.clearDisplay();
  display.setTextSize(2);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  display.print(str);
  display.display();
  delay(2000);
}