#include "fan speeeed.h"

int fan_speed(float voltage_value){
        init_millis()
        sei();
        float fan_speed;
        float t = 0;
        float past_time = 0;
        float start_time = 0;
        int old_value = 0;
        int f;
        if (voltage_value > 300 && old_value < 300){
            start_time =  init_millis()
            t =(start_time - past_time);
            past_time = start_time;
        }
        voltage_value = old_value;
        f = ((1/t)*1000);
        fan_speed = (f*60)/2;
        return fan_speed;
    }

ISR(PORTB_PORT_vect)
{
	static int counter = 0;
	if (counter >=5){
		PORTB.OUT ^= 0x0F;
		counter = 0; 
	}
    PORTB.INFLAFS = PIN2_bm;
}