#include <Arduino.h>

int bs = 0;
int lbs = 0;
int c = 0;
int m = 0;
unsigned long lm = 0;
const byte numbers[10] = {
  0b00111111,
  0b00000110,
  0b01011011,
  0b01001111,
  0b01100110,
  0b01101101,
  0b01111101,
  0b00000111,
  0b01111111,
  0b01101111
};

void setup() {
  DDRD |= 0b11111100;
  DDRB |= 0b00000001;
  DDRB &= ~(1 << PB1);
  PORTB |= (1 << PB1);
}

void loop() {
  bs = PINB & (1 << PB1) ? HIGH : LOW;
  if (bs == LOW && lbs == HIGH) {
    if (millis() - lm >= 200) {
      lm = millis();
      m++;
      if (m > 2) m = 0;
    }
  }
  lbs = bs;

  if (m == 1) {
    if (millis() - lm >= 1000) {
      lm = millis();
      c++;
      if (c > 9) c = 0;
    }
  } else if (m == 2) {
    c = 0;
  }

  PORTD = (PORTD & 0b00000011) | ((numbers[c] & 0b00111111) << 2);
  if (numbers[c] & 0b01000000) {
    PORTB |= 0b00000001;
  } else {
    PORTB &= 0b11111110;
  }
}