#define s0 2
#define s1 4
#define s2 5
#define s3 18

void setup() 
{
  pinMode(s0, OUTPUT);
  pinMode(s1, OUTPUT);
  pinMode(s2, OUTPUT);
  pinMode(s3, OUTPUT);
  pinMode(33, OUTPUT);

    digitalWrite(s0, LOW);    //0   1   1   1   14
    digitalWrite(s1, HIGH);
    digitalWrite(s2, HIGH);
    digitalWrite(s3, HIGH);
}
 
void loop() 
{
    digitalWrite(33, HIGH);
    delay(500);
    digitalWrite(33, LOW);
    delay(500);  
}