const int BTN = 4;
const int LEDS[7] = {13, 12, 11, 10, 9, 8, 7};
const int PATTERN[16] = {B11111100,B01100000,B11011010,B11110010,B01100110,B10110110,B10111110,B11100000,B11111110,B11110110,B11101110,B00111110,B00011010,B01111010,B10011110,B10001110};

unsigned long startMillis;
unsigned long currentMillis;
unsigned long btnMillis;
const unsigned long period = 1000;
const unsigned long bouncePeriod = 20;
int btnState = 0;
int mode = 1;
byte counter = -1;

void setup() {
  pinMode(BTN, INPUT_PULLUP);
  for (int i = 0; i < 7; i++) {
    pinMode(LEDS[i], OUTPUT);
  }
  startMillis = millis();
  Serial.begin(9600);
}

void loop() {
  currentMillis = millis();
  btnState = digitalRead(BTN);
  if (btnState == LOW && btnMillis - startMillis >= bouncePeriod) {
    mode = -mode;
    btnMillis = currentMillis;
    startMillis = currentMillis - period;
  }
  if (currentMillis - startMillis >= period) {
    counter += mode;
    counter %= 16;
    for (int i = 0; i < 7; i++) {
      digitalWrite(LEDS[i], (PATTERN[counter]) & (128>>i));
    }
    startMillis = currentMillis;
  }
}