use functions for 7-seg

int d2 = 2;
int d3 = 3; //DIGITAL
int d5 = 5;
int d6 = 6;
int d10 = 10;
int d11 = 11;
int d13 = 13;

// int d3 = 3;
//int d5 = 5;
void setup() {
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(d2, OUTPUT);
  pinMode(d3, OUTPUT);
  pinMode(d5, OUTPUT);
  pinMode(d6, OUTPUT);
  pinMode(d10, OUTPUT);
  pinMode(d11, OUTPUT);
  pinMode(d13, OUTPUT);
  Serial.begin(9600);

}

void allOn() {
  digitalWrite(d2, HIGH);
  digitalWrite(d3, HIGH);
  digitalWrite(d5, HIGH);
  digitalWrite(d6, HIGH);
  digitalWrite(d10, HIGH);
  digitalWrite(d11, HIGH);
  digitalWrite(d13, HIGH);
}

void allOff() {
  digitalWrite(d2, LOW);
  digitalWrite(d3, LOW);
  digitalWrite(d5, LOW);
  digitalWrite(d6, LOW);
  digitalWrite(d10, LOW);
  digitalWrite(d11, LOW);
  digitalWrite(d13, LOW);
}

void loop() {
  //B
  allOn();
  delay(1500);

  //TURN DISPLAY OFF
  allOff();
  delay(1500);

  digitalWrite(d2, HIGH);
  digitalWrite(d3, HIGH);
  digitalWrite(d5, HIGH);
  //  digitalWrite(d6, HIGH);
  digitalWrite(d10, HIGH);
  digitalWrite(d11, HIGH);
  digitalWrite(d13, HIGH);
  delay(1500);  // CMiYC added this...
}