poscope is a software-based oscilloscope written as part of an advanced physics laboratory project at Grand Valley State University. It was part of my final project in the course in lieu of an independent experiment. It exists here simply as a curiosity.
poscope measures voltage changes over time and displays a real-time graph of these in the gui interface. The program uses a National Instruments NI USB-6009 data acquisition device (DAQ) to read the voltages via the the NiDAQmx API, adapted to Python by the PyDAQmx bindings. The interface is written in Qt4 using PyQt4, and the raw data is crunched using NumPy.
poscope was written mainly to gain an understanding of how oscilloscopes work and not to be a practical oscilloscope. As such, programming best practices were not necessarily followed. While I tried to keep things sane, inevitably the learning-oriented focus interfered with proper program design. So, don't use poscope if you need something dependable. Use a real oscilloscope, software or otherwise.
It has been a while since I've written this and I don't have access to an NI6009 to test things, so I don't know the state of the program. It works to a satisfactory degree, else I would not have passed my class :) but beyond that I'm not sure. If you're curious, feel free to poke around!
In the report/ directory you can find my lab report on poscope. It's
a short analysis and explanation of what poscope is, what it can do,
how it does some of those things, and what it's shortcomings
are. Please look through it if you're at all interested. You can
download a pdf version or the original LaTeX source.