loopos valami

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//OLED DISPLAY
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

float start, finished;
float elapsed, time;
float circMetric=2.093;
float circImperial;
float speedk, speedm;


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

  circImperial=circMetric*.62137;

  attachInterrupt(digitalPinToInterrupt(2), speedCalc, RISING);
  start=millis();

}
void speedCalc()
{
  if((millis()-start)>100) // 100 millisec debounce
    {
    elapsed=millis()-start;

    start=millis();

    speedk=(3600*circMetric)/elapsed;

    speedm=(3600*circImperial)/elapsed;
    }
}


void loop() {
  speedCalc();
  Serial.print(int(speedk));
  Serial.print(" km/h ");
  Serial.println();
  delay(100);

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println(int(speedk));
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(80,17);
  display.println("km/h");
  display.display();
  delay(100);

}

int bouble = 0;
void count()
{
  bouble++;
}