We’re getting ready for the Global Geek Tour of New York. For those of you who can’t join us at the World Maker Faire, here’s a quick logic analyzer demo using a single block of the Magnificent Nixie Thing we’re tinkering with.
Each nixie module has 2 tubes and control circuitry based on new old stock Soviet driver chips. Two nixie drivers are connected to a 74HCT595 serial to parallel output chip. The setup is driven via a simple Arduino sketch that increments the numbers shown on the tubes.
A logic analyzer is a miraculous debugging tool that records invisible electrical signals and shows them on a screen. This is a life saver when you can’t figure out why a circuit isn’t working.
In this case we tap the Logic Sniffer into the wires between the Arduino and the nixie module. It records the signals and displays them as a graph on the computer screen.
The signal here decodes to 01000100. Given the schematic and info from last week, can you tell what digit lights with that value?
No workshop video next week, but the following week look for a new style of geek video from the New York trip. It’s evolving.
If you want to know more about the project design, check out our previous video about it.