byte transmit[12] = { 2, 3, 4, 5, 2, 3, 4, 5, 2, 3, 4, 5 } ; //define our transmit pin
byte mask [12] = { 1, 2, 4, 8, 1, 2, 4, 8, 1, 2, 4, 8 }; //my bit mask
byte data = 0; //value to transmit, binary
byte bitDelay = 100;

byte pullPinOne[12] = { 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 } ;
byte pullPinTwo[12] = { 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 } ;
byte pullPinThree[12] = { 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 } ;

int i;

void setup() {

  for (i=0; i<12; i++) {
    pinMode(transmit[i],OUTPUT);
    pinMode(pullPinOne[i], OUTPUT);
    pinMode(pullPinTwo[i], OUTPUT);
    pinMode(pullPinThree[i], OUTPUT);
  }

  Serial.begin(9600);
}

void loop() {

 if (Serial.available() > 0) { 
  data = Serial.read();
 
 
 for (i = 0; i<12; i++) {
    if (data & mask[i]){ // if bitwise AND resolves to true
      digitalWrite(transmit[i],HIGH); // send 1
      digitalWrite(pullPinOne[i], HIGH);
      digitalWrite(pullPinTwo[i], HIGH);
      digitalWrite(pullPinThree[i], LOW);
    }
    else { //if bitwise and resolves to false
      digitalWrite(transmit[i],LOW); // send 0
      digitalWrite(pullPinOne[i], HIGH);
      digitalWrite(pullPinTwo[i], HIGH);
      digitalWrite(pullPinThree[i], LOW);
    }
    delayMicroseconds(bitDelay); //delay
  }
  Serial.println(data,BIN);
 }
}