Cleaning the workshop and found 1 complete kit left. This will probably be the last one I will ever sell! The tubes are too hard to find now!

You may have heard of Nixie tubes, but have you heard of Numitrons? Numitron displays are cousins to the equally unique Nixie displays used before the introduction of LEDs. While Numitron tubes have the same beautiful glowing orange appearance as Nixie tubes, they operate at only 5 volts rather than the 170+ volts Nixie tubes require, making them simpler to power and safer to use in a kit.

This clock uses four rare Russian IV-9 Numitron tubes, manufactured by the Reflektor company in the former USSR, to display the time. This was the same company that produced the popular IN- series Nixie tubes. The clock runs off of an ATMega328 processor programmed using the Arduino IDE. Timekeeping is provided by an included DS3231 real-time-clock IC, and the tubes are driven by the TPIC6B595 shift register IC.

While the clock is preprogrammed and ready to be plugged in or assembled out of the box, it was also designed to be hackable. The annotated source code was designed to be easily modified, and a female header breaks out one digital pin, along with 5v and ground, for connecting additional devices such as sensors. The ATMega micro controller can be easily reprogrammed using an Arduino board and the Arduino IDE.

NOTE: First image shows the old board design. Additional pictures show the newly revised version, with the red circuit board, which is being sold.

Features:

• USB Powered (5v, 1000mA) USB-B Cable required, or solder power supply directly to the board.
• All through-hole construction for easy soldering
• Four IV-9 Numitron tubes directly driven using the TPIC6B 595 chip.
• 12-hour and 24-hour time display
• Adjustable tube brightness and time based auto-dimming option
• Leading zero blanking option
• Extremely accurate time keeping with battery backup. (Note: 2032 button cell battery not included due to shipping restrictions)
• Very unique, eye catching appearance
• Easily 'hackable' hardware and software
• Redesigned, improved circuit board
• Menu system for adjusting all of the settings
• Light sensor and the option to dim tubes in low ambient light
• Adjustable auto-display of date
• Loud piezo buzzer for alarm

- View Documentation for assembly and operation instructions - - - -

Ships worldwide. Some previous customers had concerns about the shipping methods I have used in the past, but please note that the way I package orders has been completely redone. Your clock or kit will be very securely packaged in foam wrapping and shipped in a sturdy Flat Rate box. Safe delivery is guaranteed!

All parts, including a preprogrammed ATMega328 microcontroller, supplied. Uses USB printer type cable needed for power, included, or 5v supply can be soldered to breakout pins

Available as a kit requiring soldering or fully assembled Ships from USA

Contact me for more information.

Assembly and operation instructions for older revisions of the kit can be found at the following link: https://www.dropbox.com/s/erlsq40mk8ipfs5/numitron2.pdf?dl=0