GM4JJJ 4 Digit Arduino LED GPS Clock Files

// David Anderson GM4JJJ March 2014 www.gm4jjj.co.uk 
// 24 hour clock with leading 0
// GPS for time set and sync
// Automatic DST for Local Time (choose Time Zone)
// IR receiver and remote control for changing between Local Time and UTC (Press the 'Mode' button remote)
// Demo of LED multiplexing in slow motion for fun and education (Press the 'Repeat' button on remote)
// Immediately cancel the demo of LED multiplexing by pressing the 'Power - On/Off' button on the remote

// Note that the GPS receiver is connected to the only hardware serial port on the Uno
// This means that you NEED TO DISCONNECT the GPS RX serial lead WHEN UPLOADING the SKETCH
// SoftwareSerial does not work adequately for this application. A Mega with more than one hardware serial port is another option.


// Acknowledgements:
// This clock engine is partly based on code from nootropicdesign.com
// also Jeremy Saglimbeni 2011 - thecustomgeek.com 
// also Alarm_Clock Joe Pardue December 20, 2012 www.smileymicros.com\blog
// <TinyGPS++.h>  http://arduiniana.org/libraries/tinygpsplus/
// <Time.h>      // Time Utilities http://github.com/Kernald/time
// <Timezone.h>    //http://github.com/JChristensen/Timezone
// <IRremote.h> // IR receiver http://github.com/shirriff/Arduino-IRremote

// The Sainsmart UNO R3 Starter Kit http://www.sainsmart.com/starter-kits/uno-r3-smartkits/sainsmart-uno-r3-starter-kit-with-16-basic-arduino-projects.html
// Ublox NEO-6M GPS Module Aircraft Flight Controller For Arduino (eBay)

// For 5461AS LED display, 4 digits, 7 segments with decimal points, no colon, COMMON CATHODE.
// Pin out of the 5461AS device:
// LEDPIN Name
// 1      Segment E
// 2      Segment D
// 3      Decimal Point
// 4      Segment C
// 5      Segment G
// 6      Digit 4 Cathode
// 7      Segment B
// 8      Digit 3 Cathode
// 9      Digit 2 Cathode
// 10     Segment F
// 11     Segment A
// 12     Digit 1 Cathode


// Arduino UNO Pins, there are actually 20 pins that you can use.
// There are digital 0-13 (3, 5, 6, 9, 10, and 11 capable of PWM output), and then Analog In A0-A5.
// These Analog pins can also be referred to as pins 14-19.
// Even though they are analog ‘input’ pins, they behave just the same as a digital pins, with the added function of 8 bit ADC on each one.
// (It can measure voltage in 1,024 steps.)