#include <avr/interrupt.h>

void setup() {

TCCR1A = B11110010;
TCCR1B = B00011010;  // preskaler 8

ICR1 = 3333 ;
OCR1A = 400;
OCR1B = 0;
pinMode (11, OUTPUT);
pinMode (12, OUTPUT);
}

void loop()
{
unsigned int n;

   for (unsigned int i = 0; i <500; i++) {
   OCR1B = 3333-(801+800*cos(2*PI/600*(300-i)));
   delay (4);
   }
    while(1) { }

}