#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8); // RX, TX

int A = 0;
int B = 2;
int C = 3;
int D = 1;

int LED_GND = 10;
int LED = 9;

int wait = 250;

void setup() {

  mySerial.begin(4800);
  mySerial.println("Single Nixie Output Device");

  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(LED_GND, OUTPUT);
  pinMode(LED, OUTPUT);

  digitalWrite(LED_GND, LOW);
  digitalWrite(LED, HIGH);

}

void loop() {

  //8
  //reassigned - 0
  mySerial.println("0");
  digitalWrite(LED, HIGH);

  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, HIGH);

  delay(wait);


  //9
  //reassigned - 1
  mySerial.println("1");
  digitalWrite(LED, LOW);

  digitalWrite(A, HIGH);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, HIGH);

  delay(wait);


  //2
  //reassigned - 2
  mySerial.println("2");
  digitalWrite(LED, HIGH);

  digitalWrite(A, LOW);
  digitalWrite(B, HIGH);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);

  delay(wait);


  //0
  //reassigned - 3
  mySerial.println("3");
  digitalWrite(LED, LOW);
  
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);

  delay(wait);


  //4
  //reassigned - 4
  mySerial.println("4");
  digitalWrite(LED, HIGH);

  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);

  delay(wait);


  //1
  //reassigned - 5
  mySerial.println("5");
  digitalWrite(LED, LOW);

  digitalWrite(A, HIGH);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);

  delay(wait);


  //5
  //reassigned - 6
  mySerial.println("6");
  digitalWrite(LED, HIGH);

  digitalWrite(A, HIGH);
  digitalWrite(B, LOW);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);

  delay(wait);


  //6
  //reassigned - 7
  mySerial.println("7");
  digitalWrite(LED, LOW);

  digitalWrite(A, LOW);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);

  delay(wait);


  //7
  //reassigned - 8
  mySerial.println("8");
  digitalWrite(LED, HIGH);

  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);

  delay(wait);


  //3
  //reassigned - 9
  mySerial.println("9");
  digitalWrite(LED, LOW);

  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);

  delay(wait);

}