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Create a Virtual Instrument that will be used to generate an arbitrary
waveform from user specified information. Your subVI should have the
following controls and indicators. Default values are given in
brackets when appropriate.
Controls
- Waveform Type - Used to select the
type of waveform (sine wave, triangular wave, sawtooth wave, square
wave). Use an enumerated data type. [Sine Wave]
- Amplitude - The peak amplitude of
the waveform. [1.00]
- Frequency (Hz) - The frequency in
Hz (i.e. cycles/sec) of the waveform. [10.0]
- DC Offset - A constant offset of
the waveform from zero. [0.0]
- Sampling Rate (samples/sec) - This
is the number of samples (points) per second in the waveform. [1000]
- Number of Samples - The total
number of samples (points) in the waveform. [1000]
- Duty Cycle - The percent of time a
square wave remains high over one complete period. Used for square
waves only. [50 %]
Indicators
- Waveform Out - The waveform
described by the parameters Waveform Type, Amplitude, Frequency, DC
Offset, Sampling Rate, Number of Samples, and Duty Cycle. Display
this waveform on a waveform graph on the front panel.
You will need to use the waveform generation
VIs named Sine Wave.vi, Triangle Wave.vi, Sawtooth Wave.vi, and Square
Wave.vi. Refer to the help files for additional information about
these VIs. In the help files you will notice the the
"frequency" parameter f is normalized and is in units of cycles
per sample. You will need to use your Frequency and Sampling Rate
parameters to compute the appropriate f. You will also need to compute
the appropriate value for dt when you build the waveform.
Additional Requirements
- Document the controls and indicators on
this virtual instrument.
- Create an icon for the VI and connect the
controls and indicators to terminals on the icon to create a subVI that
we will use in a later exercise.
- Document the subVI by entering a
description in the VI Properties dialog box.
- Print your subVI with the "Using as
subVI" option of the print dialog.
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