arduinix_gps_timer_isr

Arduino code for using the ArduiNIX Nixie shield with a GPS for time synchronisation and timer interrupts for stable tube multiplexing/refreshing

What is it

Arduino code for using the excellent ArduiNIX Nixie shield: http://arduinix.com/
With an added GPS for time synchronisation
And Timer1 interrupt used for Nixie tube refreshing / multiplexing, for a stable non-jittering tube display
Non-blocking tube refreshing (no delay()-functions used)
Displays a loading bar during first GPS timesync
Handles Timezones and DST correctly. Timezone can be configured at compile-time.

Target board

Timings have only been verified on ATMEGA 2560. Adjustments might be needed for Arduino Uno boards.

Pinout

Default ArduinNIX pinout for 6 nixie tubes:

SN74141 (1)

ledPin_0_a: 2;
ledPin_0_b: 3;
ledPin_0_c: 4;
ledPin_0_d: 5;

SN74141 (2)

ledPin_1_a: 6;
ledPin_1_b: 7;
ledPin_1_c: 8;
ledPin_1_d: 9;

Anode pins

ledPin_a_1: 10
ledPin_a_2: 11
ledPin_a_3: 12
ledPin_a_4: 13

Ublox Neo-6M GPS module using SPI

SPI pins on ICSP header (MISO, MOSI, SCK)
ublox_CSn_PIN: A5
ublox_RESETn_PIN: A4