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ever since I found this http://www.thinkgeek.com/interests/moms/7437/ i've always wanted one.

last year I made a python program that ran the graphics.py library and used it on my desktop.. now that I have an arduino I wanted to make a physical one..

so I wrote all the code by hand except for the time funtions. so it's very messy I haven't had the time to clean it up and i'm sure I've made a few.........a lot of progaming sins. so feel free to pick it apart and make fun of me..  ;D  it takes alot to hurt my feelings.

big thanks to raron for his help with the random function.

the clock stays surprisingly accurate I had it run for two days straight and it's not one second off.  the multiplexing was tricky I couldn't understand other peoples code so i tried to make my own based on what i understood on how it works. so some how it works it may not be the right way but it works.






Code:
#include <DateTime.h>
#include <DateTimeStrings.h>

#define TIME_MSG_LEN  11   // time sync to PC is HEADER followed by unix time_t as ten ascii digits
#define TIME_HEADER  255   // Header tag for serial time sync message
int colpins[] = {13, 9, 8, 7, 6, 5, 4, 3, 2,};
int rowpins[] = {12, 11, 10};
float ms = .2;
char top;


void setup() {
  Serial.begin(19200);
  for (int pin=0; pin<9; pin++) {
pinMode( colpins[pin], OUTPUT );
  }
for (int pin=0; pin<3; pin++) {
pinMode( rowpins[pin], OUTPUT );
}
DateTime.sync(DateTime.makeTime(0, 8, 11, 10, 4, 2010));;

  }

/* void hoursplit(){
  */
int x;
int hourlist2[3];
int hourlist[9];
int minlist2[6];
int minlist[9];
int oldminute;
void loop(){

delay (ms);
  

int hour = (DateTime.Hour);
int minute = (DateTime.Minute);
int seconds = (DateTime.Second);
int newhour = 0;

if (seconds == 0) {
Serial.println(seconds);
   // reset
  for (int i = 0; i < 9; i++){
  minlist[i] = 0;
  hourlist[i] = 0;
}
  for (int i = 0; i < 6; i++) {
    minlist2[i] = 0;
  }
  for (int i = 0; i < 3; i++) {
    hourlist2[i] = 0;
  }  
  
  
   //math
  if (hour > 12){
    newhour = hour - 12;
  }
  if (hour < 12) {
    newhour = hour;
  }
if (newhour == newhour){
    if (newhour == 0) {
      hourlist2[0] = 1;
      hourlist[0] = 1;
      hourlist[1] = 1;
    }
    if (newhour == 12){
      hourlist2[0] = 1;
      hourlist[0] = 1;
      hourlist[1] = 1;
    }
    if (newhour == 11){
      hourlist2[0] = 1;
      hourlist[0] = 1;

    }
    if (newhour == 10){
      hourlist2[0] = 1;
      hourlist2[1] = 0;
      hourlist2[2] = 0;
      for (int i = 0; i < 9; i++){
        hourlist[i] = 0;
    }
  }
  if (newhour > 0 && newhour < 10) {
    for (int i = 0; i < newhour; i++){
      hourlist[i] = 1;
    }
  }

   if (minute >= 0 and minute < 10) {
    minlist2[0] = 0;
    minlist2[1] = 0;
    minlist2[2] = 0;
    minlist2[3] = 0;
    minlist2[4] = 0;
    minlist2[5] = 0;
    minute -= 0;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
  }
   if (minute >= 10 and minute < 20) {
    minlist2[0] = 1;
    minlist2[1] = 0;
    minlist2[2] = 0;
    minlist2[3] = 0;
    minlist2[4] = 0;
    minlist2[5] = 0;
    minute -= 10;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
  }
   if (minute >= 20 and minute < 30) {
    minlist2[0] = 1;
    minlist2[1] = 1;
    minlist2[2] = 0;
    minlist2[3] = 0;
    minlist2[4] = 0;
    minlist2[5] = 0;
    minute -= 20;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
  }
  if (minute >= 30 and minute < 40) {
    minlist2[0] = 1;
    minlist2[1] = 1;
    minlist2[2] = 1;
    minlist2[3] = 0;
    minlist2[4] = 0;
    minlist2[5] = 0;
    minute -= 30;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
  }
     if (minute >= 40 and minute < 50) {
    minlist2[0] = 1;
    minlist2[1] = 1;
    minlist2[2] = 1;
    minlist2[3] = 1;
    minlist2[4] = 0;
    minlist2[5] = 0;
    minute -= 40;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
     }
      if (minute >= 50 and minute < 60) {
    minlist2[0] = 1;
    minlist2[1] = 1;
    minlist2[2] = 1;
    minlist2[3] = 1;
    minlist2[4] = 1;
    minlist2[5] = 0;
    minute -= 50;
    for (int i = 0; i < minute; i++){
      minlist[i] = 1;
    }
  }
  
}
}
if (seconds == 0 || seconds ==  15 || seconds == 30 || seconds == 45){
  if (x == 1){
  
     x = 0;
for (int a=0; a<9; a++)
{
  int r = random(a,9); // dont remember syntax just now, random from a to 8 included.
  int temp = minlist[a];
  minlist[a] = minlist[r];
  minlist[r] = temp;
 
}
for (int a=0; a<9; a++)
{
  int r = random(a,9); // dont remember syntax just now, random from a to 8 included.
  int temp = hourlist[a];
  hourlist[a] = hourlist[r];
  hourlist[r] = temp;
 
}
for (int a=0; a<6; a++)
{
  int r = random(a,6); // dont remember syntax just now, random from a to 8 included.
  int temp = minlist2[a];
  minlist2[a] = minlist2[r];
  minlist2[r] = temp;
 
}
for (int a=0; a<3; a++)
{
  int r = random(a,3); // dont remember syntax just now, random from a to 8 included.
  int temp = hourlist2[a];
  hourlist2[a] = hourlist2[r];
  hourlist2[r] = temp;
 
}

}
}
if (seconds == 1 || seconds ==  16 || seconds == 31 || seconds == 46){
  
  x = 1;
}

  // draw



int rowone[] = {hourlist2[0], hourlist[0], hourlist[1], hourlist[2], minlist2[0], minlist2[1], minlist[0], minlist[1], minlist[2]};
int rowtwo[] = {hourlist2[1], hourlist[3], hourlist[4], hourlist[5], minlist2[2], minlist2[3], minlist[3], minlist[4], minlist[5]};
int rowthree[] = {hourlist2[2], hourlist[6], hourlist[7], hourlist[8], minlist2[4], minlist2[5], minlist[6], minlist[7], minlist[8]};
 delay(ms);
  for (int i = 8; i >= 0; i--) {
    if (rowone[i] == 1){
      digitalWrite(colpins[i], HIGH);
      digitalWrite(rowpins[0], HIGH);
    }
      
  }
  delay(ms);
  for (int i = 8; i >= 0; i--) {
      digitalWrite(colpins[i], LOW);
      digitalWrite(rowpins[0], LOW);  
  }
  delay(ms);
  
  for (int i = 8; i >= 0; i--) {
    if (rowthree[i] == 1){
      digitalWrite(colpins[i], HIGH);
      digitalWrite(rowpins[2], HIGH);
    }
      
  }
  delay(ms);
  for (int i = 8; i >= 0; i--) {
      digitalWrite(colpins[i], LOW);
      digitalWrite(rowpins[2], LOW);  
  }
  delay(ms);
  
    for (int i = 8; i >= 0; i--) {
    if (rowtwo[i] == 1){
      digitalWrite(colpins[i], HIGH);
      digitalWrite(rowpins[1], HIGH);
    }
      
  }
  delay(ms);
  for (int i = 8; i >= 0; i--) {
      digitalWrite(colpins[i], LOW);
      digitalWrite(rowpins[1], LOW);  
  }
  delay(ms);
  
  

// Time
unsigned long  prevtime;
  if( getPCtime()) {  // try to get time sync from pc
    Serial.print("Clock synced at: ");
    Serial.println(DateTime.now(),DEC);
  }
  if(DateTime.available()) { // update clocks if time has been synced
    digitalWrite(13,LOW);  // first flash the LED
    prevtime = DateTime.now();

    DateTime.available(); //refresh the Date and time properties


  }
}
boolean getPCtime() {
  // if time sync available from serial port, update time and return true
  while(Serial.available() >=  TIME_MSG_LEN ){  // time message consists of a header and ten ascii digits
    if( Serial.read() == TIME_HEADER ) {        
      time_t pctime = 0;
      for(int i=0; i < TIME_MSG_LEN -1; i++){  
        char c= Serial.read();
        top = c;        
        if( c >= '0' && c <= '9'){  
          pctime = (10 * pctime) + (c - '0') ; // convert digits to a number    
        }
      }
        
      DateTime.sync(pctime);   // Sync Arduino clock to the time received on the serial port
      return true;   // return true if time message received on the serial port
    }  
  }
  return false;  //if no message return false
}



Cheers,
Dave Johnson
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forgot to mention that i'm planning on getting a wwvb receiver and sync it to the atomic clock.
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Hi, great work! I ever loved the tix led, and now i want to try with your code!!! Can you tell me or send a pm about the led connection? Thanks!!
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This is very cool. Kind of like a binary clock, but less binary.  smiley

I am now considering building my own someday.
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A-R-D-U-I-N-O... GoooOOOO ARDUINO!
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Nicely done!

I too have wanted one of these forever, and figured I could do one myself. Just need the time!

Do you have plans for a more permanent mounting (rather than breadboard)?
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 :o cool!

my aunt gave me one for christas years ago.
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