   lcd.print("Start calibration... ");
   lcd.setCursor(9, 2);
   lcd.print(" MHz");
-  timer2.setup();
   attachInterrupt(1, myinthandler, RISING);
 }
 


void myinthandler() {

  //currentMicros = micros() ;
  currentMicros = timer2.get_count() / 2.0;
  duration = currentMicros - previousMicros;
  previousMicros = currentMicros; 


// Calibration of Arduino quartz ( 16 MHz) with a reference of 1 Hz 

#include <DS3232RTC.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
