void setup()
{
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
}
void loop()
{
digitalWrite(3,HIGH);
delay(500);
digitalWrite(3,LOW);
delay(125);
digitalWrite(4,HIGH);
delay(500);
digitalWrite(4,LOW);
delay(125);
digitalWrite(5,HIGH);
delay(500);
digitalWrite(5,LOW);
delay(125);
digitalWrite(6,HIGH);
delay(500);
digitalWrite(6,LOW);
delay(125);
}