void setup() {
  pinMode(2, OUTPUT);//a
  pinMode(3, OUTPUT);//b
  pinMode(4, OUTPUT);//c
  pinMode(5, OUTPUT);//d
  pinMode(6, OUTPUT);//e
  pinMode(7, OUTPUT);//f
  pinMode(8, OUTPUT);//g

}

void loop() {
  digitalWrite(2,0);
  digitalWrite(3,0);
  digitalWrite(4,1);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,1);
  digitalWrite(8,0);
  delay(150);


  digitalWrite(2,0);
  digitalWrite(3,0);
  digitalWrite(4,0);
  digitalWrite(5,0);
  digitalWrite(6,0);
  digitalWrite(7,0);
  digitalWrite(8,0);
  delay(150);
  

}