Arduino.ru

Здравствуйте! 

Собственно сделала таймер, решила сделать его отправить считать в обратную сторону и тут мой мозг отказывается думать. совсем. Точнее как я понимаю, что именно надо сделать, но что-то реализовать не могу. 

https://www.tinkercad.com/things/2IBeQntw02L-copy-of-etaopi-vikko1/editel?tenant=circuits Вот тут вся схема, весь код тоже есть. 

На всякий случай сюжа тоже вставлю код, но тут много левого: 

#define LED1 11
#define LED2 10
#define LED3 9
#define ASEG 2
#define BSEG 3
#define CSEG 4
#define DSEG 5
#define ESEG 6
#define FSEG 7
#define GSEG 8
#define START 12
#define STOP 13
#define MINPRESET 0

int msec = 0, second = 0, minute = 0, hour = 9;
int clockrun = 0;
int timerms, timersec, timermin;

void setup()
{
  Serial.begin(9600);

pinMode(ASEG, OUTPUT);
pinMode(BSEG, OUTPUT);
pinMode(CSEG, OUTPUT);
pinMode(DSEG, OUTPUT);
pinMode(ESEG, OUTPUT);
pinMode(FSEG, OUTPUT);
pinMode(GSEG, OUTPUT);
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(START, INPUT);
pinMode(STOP, INPUT);

cli();
TCCR0A = 0;
TCCR0B = 0;
TCNT0 = 0;

OCR0A = 124;
TCCR0A |=(1 << WGM01);
TCCR0B |=(1 << CS01) | (1 << CS00);
TIMSK0 |= (1 << OCIE0A);
sei();
}

ISR(TIMER0_COMPA_vect){
	if(msec < 2000) msec++;
  	else {			
		msec = 0;
      if (clockrun)
      {
        
		second++;
		if (second > 59)
				{
             second = 0;
			minute++;
				if (minute > 9)
						{
						minute = 0;
						}
				}
}
    }
}


void number (int nro)
{
switch (nro)
{
case 8: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, LOW);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, LOW);
break;

  
  
case 9: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, LOW);
break;


case 0: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, LOW);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, HIGH);
break;


case 1: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, HIGH);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, HIGH);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, HIGH);
digitalWrite(GSEG, HIGH);
break;


case 2: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, HIGH);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, LOW);
digitalWrite(FSEG, HIGH);
digitalWrite(GSEG, LOW);
break;


case 3: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, HIGH);
digitalWrite(GSEG, LOW);
break;


case 4: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, HIGH);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, HIGH);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, LOW);
break;


case 5: digitalWrite(ASEG, HIGH);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, LOW);
break;


case 6: digitalWrite(ASEG, HIGH);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, LOW);
digitalWrite(ESEG, LOW);
digitalWrite(FSEG, LOW);
digitalWrite(GSEG, LOW);
break;


case 7: digitalWrite(ASEG, LOW);
digitalWrite(BSEG, LOW);
digitalWrite(CSEG, LOW);
digitalWrite(DSEG, HIGH);
digitalWrite(ESEG, HIGH);
digitalWrite(FSEG, HIGH);
digitalWrite(GSEG, HIGH);
break;
}
  
}

void loop()
{
  
  if (digitalRead(START) == 0 && clockrun == 0)
     { 
       clockrun = 1;
       while(digitalRead(START) == 0);
     }
  if (digitalRead(STOP) == 0 && clockrun == 1)
     { 
       clockrun = 0;
       while(digitalRead(STOP) == 0);
     }
  if (digitalRead(STOP) == 0 && clockrun == 0)
     { 
       minute  = MINPRESET;
    	second = 0;
       while(digitalRead(STOP) == 0);
     }
  
number(minute);
digitalWrite(LED1, LOW);
digitalWrite(LED2, HIGH);
digitalWrite(LED3, HIGH);
delay(20);
digitalWrite(LED1, HIGH);

number(second/10);
digitalWrite(LED1, HIGH);
digitalWrite(LED2, LOW);
digitalWrite(LED3, HIGH);
delay(20);
digitalWrite(LED2, HIGH);

number(second%10);
digitalWrite(LED1, HIGH);
digitalWrite(LED2, HIGH);
digitalWrite(LED3, LOW);
delay(20);
digitalWrite(LED3, HIGH);

  Serial.println(second);
  
}

Подскажите куда чего и как :)