#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
int test=88;

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET            4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
void setup() 
{
  display.begin(SSD1306_SWITCHCAPVCC, 0x78>>1);
  display.display();
  delay(2000);
  display.clearDisplay();   
}

void loop() {
  display.setTextSize(1.9);
  display.setTextColor(WHITE);  
  display.setCursor(54,0);
  display.print("RPM");  
  display.setTextSize(2);
  display.setCursor(40, 32);
  display.print(" "+String(test));  
  display.drawRect(10, 17, 108, 45, WHITE); // drawRect(x,y,w,h,color)
  display.display();
  delay(1000);
  display.clearDisplay(); 
}