int ones=2;
int twos=3;
int fours=4;
int eights=5;
int waitTime=1000;

void setup() {
  // put your setup code here, to run once:
  pinMode(ones, OUTPUT);
  pinMode(twos, OUTPUT);
  pinMode(fours, OUTPUT);
  pinMode(eights, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(ones, LOW); //0
  digitalWrite(twos, LOW);
  digitalWrite(fours, LOW);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, HIGH); //1
  digitalWrite(twos, LOW);
  digitalWrite(fours, LOW);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, LOW); //2
  digitalWrite(twos, HIGH);
  digitalWrite(fours, LOW);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, HIGH); //3
  digitalWrite(twos, HIGH);
  digitalWrite(fours, LOW);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, LOW); //4
  digitalWrite(twos, LOW);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, HIGH); //5
  digitalWrite(twos, LOW);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, LOW); //6
  digitalWrite(twos, HIGH);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, HIGH); //7
  digitalWrite(twos, HIGH);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, LOW);
  delay(waitTime);

  digitalWrite(ones, LOW); //8
  digitalWrite(twos, LOW);
  digitalWrite(fours, LOW);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, HIGH); //9
  digitalWrite(twos, LOW);
  digitalWrite(fours, LOW);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, LOW); //10
  digitalWrite(twos, HIGH);
  digitalWrite(fours, LOW);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, HIGH); //11
  digitalWrite(twos, HIGH);
  digitalWrite(fours, LOW);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, LOW); //12
  digitalWrite(twos, LOW);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, HIGH); //13
  digitalWrite(twos, LOW);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, LOW); //14
  digitalWrite(twos, HIGH);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, HIGH);
  delay(waitTime);

  digitalWrite(ones, HIGH); //15
  digitalWrite(twos, HIGH);
  digitalWrite(fours, HIGH);
  digitalWrite(eights, HIGH);
  delay(waitTime);

}