Flock of Butterflies has just published their third post in a series about the ArduiNIX, an Arduino shield that drives Nixie tubes.We’ve featured Nixie tube projects such as a single tube clock, free-formed Nixie circuits, and tubes in a bottle. Now the hurdle of handling high voltage tubes while protecting low voltage logic circuitry has been taken care of for you. The shield can be purchased as a kit but the Eagle CAD files are also available, allowing you to etch your own circuit board.

Although this is meant for the Arduino there is nothing to keep you from using it as a driver with any microcontroller. The board listens for 5V logic levels to switch the multiplexed display of up to eight tubes. Get your hands on some Nixies and give this a try yourself.

Related: ArduiNIX Part 1, ArduiNIX Part 2

When we saw this giant home vacuum tube, we thought it would go perfectly along side the giant LED lamp . Constructed from spare computer parts, a glass display dome and some EL wire, it is fairly convincing looking. If only he had shaped some characters with the EL wire, we could do a giant nixie tube project.

We love old display technology, like Nixie tubes, but they’re often difficult to work with because they require higher voltages than digital logic. Vacuum florescent displays (VFD) fall into this category. While not necessarily “old”, they are becoming far less common than LCDs. The main benefit of a VFD is that it actually produces light directly; it doesn’t require a backlight. You’ll find these displays on various players and appliances: CD, DVD, VCR, microwaves, stoves, car headunits, and others.

[Sprite_tm] had written off some VFDs, but recently revisited them with renewed interest. He started by testing what sort of voltage would be required to drive the display. It took 3V for the filament plus 15V to drive the grids. There are VFD controller chips available, but he wanted to get this working with what he had on hand. He had experience with older 40xx series logic, which can be powered by much higher voltages than 5V 74xx. His final schematic has three 4094 serial to parallel chips with an ATtiny2313 controller. A 5V power supply is dropped to 3V with diodes to drive the filament while a boost converter brings it up to 15V for the 4094s that switch the segments. While the code is specific to this display, it would be a great place to start your own project.