LED Binary Clock Sketch Arduino

// LED Binary clock by x2Jiggy.com 11/06/2014

/* Sketch queries a DS1307 RTC for the current time then uses
those values to switch an array of LEDs to display the time in
binary format */

#include <Wire.h> // Communicate with the RTC over I2C
#include "RTClib.h" // Adafruit DS1307 Real Time Clock Library

/* Static Variables */
static int h1 = A0;
static int h2 = 2;
static int h3 = 3;
static int h4 = 4;
static int h5 = 5;
static int h6 = 6;

static int m1 = 7;
static int m2 = 8;
static int m3 = 9;
static int m4 = 10;
static int m5 = 11;
static int m6 = 12;
static int m7 = 13;

RTC_DS1307 RTC;

void setup () {

  /* Set inputs and outputs */
  pinMode(h1, OUTPUT);
  pinMode(h2, OUTPUT);
  pinMode(h3, OUTPUT);
  pinMode(h4, OUTPUT);
  pinMode(h5, OUTPUT);
  pinMode(h6, OUTPUT);

  pinMode(m1, OUTPUT);
  pinMode(m2, OUTPUT);
  pinMode(m3, OUTPUT);
  pinMode(m4, OUTPUT);
  pinMode(m5, OUTPUT);
  pinMode(m6, OUTPUT);
  pinMode(m7, OUTPUT);

  /* Start 2IC and RTC  */
  //Serial.begin(9600);
  Wire.begin();
  RTC.begin();

}

void loop () {

  /* Get current time */

  DateTime now = RTC.now();
  int tHour = now.hour();
  int tMin = now.minute();

  /* Set First Hour Digit */

  if (tHour < 10){
    digitalWrite(h1, LOW);
    digitalWrite(h2, LOW);
  }
  else if (tHour < 20) {
    digitalWrite(h1, HIGH);
    digitalWrite(h2, LOW);
  }
  else {
    digitalWrite(h1, LOW);
    digitalWrite(h2, HIGH);
  }

  /* Set Second Hour Digit */

  // Reduce Hour int to second digit only
  int hDigit;
  if (tHour > 20) hDigit = tHour - 20;
  else if (tHour > 10) hDigit = tHour - 10;
  else hDigit = tHour;

  // Check digit against binary value of each LED and switch accordingly
  if (hDigit != 0 && hDigit != 10) {

    if (hDigit >= 8) {
      hDigit = hDigit - 8;
      digitalWrite(h6, HIGH);
    }
    else digitalWrite(h6, LOW);

    if (hDigit >= 4) {
      hDigit = hDigit - 4;
      digitalWrite(h5, HIGH);
    }
    else digitalWrite(h5, LOW);

    if (hDigit >= 2) {
      hDigit = hDigit - 2;
      digitalWrite(h4, HIGH);
    }
    else digitalWrite(h4, LOW);

    if (hDigit >= 1) digitalWrite(h3, HIGH);
    else digitalWrite(h3, LOW);

  }
  else {
    digitalWrite(h6, LOW);
    digitalWrite(h5, LOW);
    digitalWrite(h4, LOW);
    digitalWrite(h3, LOW);
  }

  /* Set First Minute Digit */

  if (tMin >= 10) {

    int mDigit1 = tMin - (tMin % 10); // Remove remainder making value divisible by 10
    mDigit1 = mDigit1 / 10; // Divide by 10 to get first minute digit

    if (mDigit1 >= 4) {
      mDigit1 = mDigit1 - 4;
      digitalWrite(m3, HIGH);
    }
    else digitalWrite(m3, LOW);

    if (mDigit1 >= 2) {
      mDigit1 = mDigit1 - 2;
      digitalWrite(m2, HIGH);
    }
    else digitalWrite(m2, LOW);

    if (mDigit1 >= 1) digitalWrite(m1, HIGH);
    else digitalWrite(m1, LOW);

  }
  else {
    digitalWrite(m1, LOW);
    digitalWrite(m2, LOW);
    digitalWrite(m3, LOW);
  }

  /* Set Second Minute Digit */

  int mDigit2; // Reduce minute int to second digit only
  if (tMin > 50) mDigit2 = tMin - 50;
  else if (tMin > 40) mDigit2 = tMin - 40;
  else if (tMin > 30) mDigit2 = tMin - 30;
  else if (tMin > 20) mDigit2 = tMin - 20;
  else if (tMin > 10) mDigit2 = tMin - 10;
  else mDigit2 = tMin;

  // Check digit against binary value of each LED and switch accordingly

  if (mDigit2 != 0 && mDigit2 != 10) {

    if (mDigit2 >= 8) {
      mDigit2 = mDigit2 - 8;
      digitalWrite(m7, HIGH);
    }
    else digitalWrite(m7, LOW);

    if (mDigit2 >= 4) {
      mDigit2 = mDigit2 - 4;
      digitalWrite(m6, HIGH);
    }
    else digitalWrite(m6, LOW);

    if (mDigit2 >= 2) {
      mDigit2 = mDigit2 - 2;
      digitalWrite(m5, HIGH);
    }
    else digitalWrite(m5, LOW);

    if (mDigit2 >= 1) digitalWrite(m4, HIGH);
    else digitalWrite(m4, LOW);

  }
  else {
    digitalWrite(m4, LOW);
    digitalWrite(m5, LOW);
    digitalWrite(m6, LOW);
    digitalWrite(m7, LOW);
  }

}