Here is an idea for a nice little project would be:
(assuming no Daq or GPIB hardware).

Open a binary file.  Parse the file to identify the OP codes and
operands.  Translate it to "english".  Display the translation and
write it to another file.

You can expand to opening a serial port, communicating to a serial
device.  Interpret the data (especially if there is some sort of
waveform to analyze).  Plot the data "real-time".  Display warnings or
conditions if low or high limits are reached, or if a number of
samples has been achieved.
Prompt for user intervention (what to do with the data, ie: save it to
file, display it, print it, etc).  Allow for user control of the vi
(Run / Pause / Stop / Abort).

The above should provide basic functionality where there is no
instrument to control or a data-acquisition system to monitor.

Are you looking for real projects?  Maybe a bit more challenging?

Regards,

-JLV-

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