void setup()
{
  pinMode(13, OUTPUT);
}

void loop()
{
  digitalWrite(13, HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  delay(500);
}
#ifndef MUX51_H
#define MUX51_H

int EN51; int S151; int S251; int S351; int Z51;

#define setMux51( int en, int s1, int s2, int s3, int z, int zMode ) { EN51 = en; S151 = s1; S251 = s2; S351 = s3; Z51 = z; pinMode ( EN51, 1 ); pinMode ( S1, 1 ); pinMode ( S2, 1 ); pinMode ( S3, 1 ); if(  )  digitalWrite ( EN51, 0 ); digitalWrite ( S151, 0 ); digitalWrite ( S251, 0 ); digitalWrite ( S351, 0 ); }

#define mux( int s1, int s2, int s3 ) { digitalWrite ( S151, s1 ); digitalWrite ( S251, s2 ); digitalWrite ( S351, s3 ); }

#endif