//initializing pins for LED and Button:
#define LED_PAIR1_PIN 13
#define LED_PAIR2_PIN 12
#define LED_PAIR3_PIN 11
#define LED_PAIR4_PIN 10
#define LED_PAIR5_PIN 9
#define LED_PAIR6_PIN 8
#define LED_PAIR7_PIN 7
#define BUTTON_PIN 6

int speedCount = 1; //how much slower the speed is

void setup(){
  // put your setup code here, to run once:
  pinMode(LED_PAIR1_PIN, OUTPUT);
  pinMode(LED_PAIR2_PIN, OUTPUT);
  pinMode(LED_PAIR3_PIN, OUTPUT);
  pinMode(LED_PAIR4_PIN, OUTPUT);
  pinMode(LED_PAIR5_PIN, OUTPUT);
  pinMode(LED_PAIR6_PIN, OUTPUT);
  pinMode(LED_PAIR7_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
}

void loop(){
  //main code here, to run repeatedly:
  if(digitalRead(BUTTON_PIN) == HIGH) {
    ledHigh();
    speedCount = speedCount + 1; //decreasing blink speed
    //blink sequentially all paired LEDs 5 times in a row:
    int i = 5;
    while ( i > 0){
     blinkLED(50*speedCount);
      i--;
    }
  }
  else{
    ledLow();
  }
}

void blinkLED(int msTime){
  //blink for given time in ms:
  digitalWrite(LED_PAIR1_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR2_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR3_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR4_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR5_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR6_PIN, HIGH);
  delay(msTime);
  digitalWrite(LED_PAIR7_PIN, HIGH);
  delay(msTime);

  digitalWrite(LED_PAIR1_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR2_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR3_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR4_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR5_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR6_PIN, LOW);
  delay(msTime);
  digitalWrite(LED_PAIR7_PIN, LOW);
  delay(msTime);
}

void ledLow(){
  //turn off all LEDs at once:
  digitalWrite(LED_PAIR1_PIN, LOW);
  digitalWrite(LED_PAIR2_PIN, LOW);
  digitalWrite(LED_PAIR3_PIN, LOW);
  digitalWrite(LED_PAIR4_PIN, LOW);
  digitalWrite(LED_PAIR5_PIN, LOW);
  digitalWrite(LED_PAIR6_PIN, LOW);
  digitalWrite(LED_PAIR7_PIN, LOW);
}

void ledHigh(){
  //turn on all LEDs at once:
  digitalWrite(LED_PAIR1_PIN, HIGH);
  digitalWrite(LED_PAIR2_PIN, HIGH);
  digitalWrite(LED_PAIR3_PIN, HIGH);
  digitalWrite(LED_PAIR4_PIN, HIGH);
  digitalWrite(LED_PAIR5_PIN, HIGH);
  digitalWrite(LED_PAIR6_PIN, HIGH);
  digitalWrite(LED_PAIR7_PIN, HIGH);
}