IV-3, IV-6 VFD 6 digit clock Shield for Arduino

Redesigned AXIRIS IV-3 Shield with DS3231. Battery and buttons ... + 2 Extra Digits

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Tested only with IV6-tubes

AXIRIS IV-3 Shield for Arduino is super great project, specially power supply is very good designed. etc. filament is driven with AC voltage which is recommended for VFD. 12V input voltage is 3x multipled to make 36V I am redesigned board for easier soldering, all components are in lines with same value

  • added buttons for HOUR / MINUTES
  • speaker driver for make alarm clock, in current firmware is only hour beep implemented
  • components values on PCB
  • DS3231 with battery backup
  • Enhanced to 6 DIGIT
  • hand painted curved traces for more retro look
  • all outputs are marked on pcb for better debugging
  • schematic is almost unchanged, some pins are swapped for better PCB routing

I created simple CLOCK arduino sketch (firmware)

  • IV-3
  • IV-6
  • IV-3 vs IV-6
  • Backlit just parallel connected LED
Little updated new layout.

Large batch PCB ORDER LINK

Required parts list IV‐3/IV-3a/IV-6 shield for Arduino (BOM )

  • 1/4W subminiature carbon THT resistors
1510 ΩØ1.8x3.2mm
21KØ1.8x3.2mm , tube light, optional
12.2 nF-
1100 nF-
28.2 nF !!!I am replaced with 100nF
422 µF 50V-
2100 µF 25V-
11N400xrectifier diode
41N5819schottky diode
6LED 3mmTube bottom light optional (choose color freely) , optional
14BC547BNPN transistor
14BC557BPNP transistor
1BC639NPN “power” transistor
1BC640PNP “power” transistor
1ICM7555timer IC (must be CMOS version, do not use a standard 555 !)
1DS3231RTC chip , optional
1Arduino UNOor clone
28headerspacing 2.54 mm
1CR1220Lithium battery , optional
1CR1220 socketBattery holder , optional
6tubeIV‐3/IV-3a/IV-6 VFD tube
2switchangled, Microswitch TACT
1Piezo 17mmbuzzer, optional

If you want original board go here >

Portable Network Graphics (PNG) - 127.86 kB - 01/05/2021 at 00:16


Portable Network Graphics (PNG) - 75.72 kB - 01/05/2021 at 00:16


Arduino code

x-zip-compressed - 5.86 kB - 07/21/2020 at 21:58


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Jakub wrote 06/02/2021 at 13:29 point

Ahoj jsem tu nový potřeboval bych poradit teprv se učím programovat ještě nic jsem neprogramoval na arduino Uno programuji tyto hodiny jenže mi to hlásí chybu nejde nahrát vůbec mám arduino Uno klon a arduino program nevím jestli se to dá nebo ne párovat díky. Jsem úplný zelenáč.

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rezite wrote 04/26/2021 at 18:44 point

Ahoj chtěl bych se zeptat zdali budou tyto hodiny fungovat i s trubicemi IV-11? děkuji

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bobricius wrote 05/23/2021 at 19:22 point

musis si skontrolovat pinout a rozmery, potom poprehadzovat nozicky

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Ian Sparkes wrote 11/16/2020 at 07:39 point

I can't find the schematic anywhere. I'm trying to figure out what you mean by "filaments driven by AC"? Are you really inverting the filament drive or just pulsing a single ended filament supply?

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bobricius wrote 01/05/2021 at 00:16 point

it is look like really inverted voltage. Including schematic in FILES

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Alin Marin Elena wrote 11/14/2020 at 21:27 point

so, finally got the time to put all the components together. is the 6 iv-6 board.

Since I do not plan to use the switches I did not install them also nothing from what is marked as optional. unfortunately things do not seem to work all i get are the base leds flashing.

now to debug I would like to understand something

 -  are the 1k and the led need? the ones on top of the buzzer.

- can I get away without the switches?

- shall the underside vin 36 or 12 be connected?

any other suggestion would be appreciated.

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Climber20 wrote 07/26/2020 at 06:06 point

You have the Arduino Code with support for ds3231 RTC?

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bobricius wrote 09/08/2020 at 11:28 point

yes, DS3231 is supported and code is in files

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Jamie Searle wrote 04/26/2020 at 17:51 point

Hi, I am new to electronics and have bought some IV-3 tubes to try to make a clock with. Would using your PCB and listed components be beginner friendly or do you recommend starting somewhere else? Thanks.

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bobricius wrote 07/19/2020 at 21:39 point

There is about 130 component to solder and more than 300 solder points, I am not sure if it is for beginner.

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Ian Shannon Weber wrote 03/14/2020 at 05:05 point

I hope your project continues to do well.

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