#define SEG_COUNT 7
const int firstSeg = 2;
byte numberSegments[16] = {
0b11000000, //0
0b11111001, //1
0b10100100, //2
0b10110000, //3
0b10011001, //4
0b10010010, //5
0b10000010, //6
0b11111000, //7
0b10000000, //8
0b10010000, //9
0b10001000, //A
0b10000011, //b
0b11000110, //C
0b10100001, //d
0b10000110, //E
0b10001110  //F
};
byte pos = 1;
int lastButton = LOW;
int currButton = LOW;

void setup() {
  for (int i = 0; i < SEG_COUNT; i++)
  {
    pinMode(firstSeg + i, OUTPUT);
    digitalWrite(firstSeg + i, bitRead(numberSegments[0], i));
  }
  pinMode(1, INPUT_PULLUP);
}

void loop() {
  static unsigned long timer;
  if(timer + 50 > millis()) return;

  currButton = digitalRead(1);
  if(lastButton == HIGH && currButton == LOW)
  {
    for(int i = 0; i < SEG_COUNT; i++)
    {
      digitalWrite(firstSeg + i, bitRead(numberSegments[pos], i));
    }
    pos = pos == 15 ? 0 : ++pos;
  }
  lastButton = currButton;
  timer = millis();
}