void init_TC0(void)
{

    // Set the Timer Mode to CTC
    TCCR0A |= (1 << WGM01);

    // Set the value that you want to count to
    OCR0A = 0xF9; //249

    //Set the ISR COMPA vect
    TIMSK0 |= (1 << OCIE0A);    

    // set prescaler to 1024 and start the timer
    TCCR0B |= (1 << CS00) | (1 << CS02);  
}