Heißer Draht Spiel mit 99 Sekunden Timer für einen Attiny 2013

Arduino Code:

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const byte startStopPin = 0, mistakePin = 1, buzzerPin = 16;

long startMillis;

void setup()
{
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);
pinMode(14, OUTPUT);
pinMode(15, OUTPUT);

pinMode(startStopPin, INPUT);
pinMode(mistakePin, INPUT);
pinMode(buzzerPin, OUTPUT);

displayNumber(0);
while(digitalRead(startStopPin) == LOW) // wait for the start signal
{ ; }

startMillis = millis();
}

void loop()
{
long number = 99 - (millis() - startMillis) / 1000;

if (number <= 0)
{
gameOver();
}

if (digitalRead(startStopPin) == HIGH && (millis() - startMillis) > 2000)
{
while(true)
{ ; }
}

if (digitalRead(mistakePin) == HIGH && (millis() - startMillis) > 2000)
{
gameOver();
}


displayNumber(number);
}

void displayNumber(byte x)
{
x %= 100;
set1(~dec27(x % 10));
set10(~dec27(x / 10));
}

void set1(byte value)
{
digitalWrite(2, bitRead(value, 0)); // segment a
digitalWrite(3, bitRead(value, 1)); // segment b
digitalWrite(4, bitRead(value, 2)); // segment c
digitalWrite(5, bitRead(value, 3)); // segment d
digitalWrite(6, bitRead(value, 4)); // segment e
digitalWrite(7, bitRead(value, 5)); // segment f
digitalWrite(8, bitRead(value, 6)); // segment g
}

void set10(byte value)
{
digitalWrite(9, bitRead(value, 0)); // segment a
digitalWrite(10, bitRead(value, 1)); // segment b
digitalWrite(11, bitRead(value, 2)); // segment c
digitalWrite(12, bitRead(value, 3)); // segment d
digitalWrite(13, bitRead(value, 4)); // segment e
digitalWrite(14, bitRead(value, 5)); // segment f
digitalWrite(15, bitRead(value, 6)); // segment g
}

byte dec27(byte decimal) {
if (decimal == 0)
return B00111111;
if (decimal == 1)
return B00000110;
if (decimal == 2)
return B01011011;
if (decimal == 3)
return B01001111;
if (decimal == 4)
return B01100110;
if (decimal == 5)
return B01101101;
if (decimal == 6)
return B01111101;
if (decimal == 7)
return B0000111;
if (decimal == 8)
return B01111111;
if (decimal == 9)
return B01101111;

return 0;
}

void gameOver()
{
displayNumber(0);
digitalWrite(buzzerPin, HIGH);
delay(3000);
digitalWrite(buzzerPin, LOW);
while (true)
{ ; }
}