NEW 6 digit version

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 multiplied 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) you download from FILES section on hackaday.io page

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

• 1/4W subminiature carbon THT resistors

1x 510 Ω 1.8x3.2mm2

1x 1K 1.8x3.2mm , tube light, optional

1x 2K7 1.8x3.2mm

1x 3K9 1.8x3.2mm

14x 10K 1.8x3.2mm

14x 68K 1.8x3.2mm

14x 100K 1.8x3.2mm

14x 220K 1.8x3.2mm

• CERAMIC/MKT /MKM CAPACITORS

1x 2.2 nF

1x 100 nF

2x 8.2 nF !!!I am replaced with 100nF

• ELECTROLYTIC CAPACITORS

4x 22 μF 50V

2x 100 μF 25V

• DISCRETE SEMICONDUCTORS

1x 1N400x rectifier diode

4x 1N5819 schottky diode

6x LED 3mm Tube bottom light optional (choose color freely) , optional

14x BC547B NPN transistor

14x BC557B PNP transistor

1x BC639 NPN “power” transistor

1x BC640 PNP “power” transistor

• INTEGRATED CIRCUITS

1x ICM7555timer IC (must be CMOS version, do not use a standard 555 !)

1x DS3231RTC chip , optional

• CONNECTORS & OTHER PARTS

1x Arduino UNO or clone

28x header spacing 2.54 mm

1x CR1220Lithium battery , optional

1x CR1220 socket Battery holder , optional

6x tubeIV‐3/IV-3a/IV-6 VFD tube

2x switch angled, Microswitch TACT

1x Piezo 17mmbuzzer, optional

If you want original board go here >

https://www.elektor.com/iv-3-vfd-shield-for-arduino-kit-150064-71

https://www.axiris.eu/en/index.php/project-corner/iv-3-shield-for-arduino