#include <Arduino.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>	
#define F_CPU 16000000UL
const int prescalar=1024;

void T0Delay (double delay);
int main (){
	double delay;
	DDRB |= (1<<PB0);		// PORTB output port
	while(1){			//repeat forever
		T0Delay(0.5);
		PORTB |= (1<<PB0);		
    T0Delay(1.0);
		PORTB ^= (1<<PB0);
	}
}



void T0Delay(double delay){
	double period = 1/(F_CPU/prescalar);
	TCNT1 = 2^16 - (int) (delay*F_CPU/prescalar);	// load TCNT1 (RUN AGAIN FOR TCCR1=2)
	TCCR1A = 0x00;   // Run Timer1, Normal mode
  TCCR1B |= (1<<CS12)|(1<<CS10);  // Prescalar = 1024 
  while ((TIFR1 & (1<<TOV1))==0);
  TIFR1 |=  (1<<TOV1);  //wait for TF0 to roll over	
	TCCR1B = 0;		    // Stop Timer
}