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Due Tuesday, February 13
for use in class !
Build a Function Generator VI using the
Waveform Generation subVI that was created in the previous assignment.
The panel below is an example of the controls and indicators that should be
present on this VI.
To compute the frequency use two
controls, one frequency knob ranging from 1 to 10 Hz and a second multiplier
with values of 1, 10, 100, 1000, and 10000. Show the actual frequency
on a digital control. You may have to work a bit to make the frequency
multiplier give the desired result.
Use an enumerated data type
control to select the type of waveform (sine, square, triangular, sawtooth).
Have controls for the Amplitude,
DC Offset and Duty Cycle as shown above.
Have a control for the update
rate (number of samples to update each second).
Compute the number of updates
(i.e. number of samples) to make exactly one complete cycle of the waveform
with the desired frequency be generated. Display this number on a
digital indicator.
Add a channel number control
[default = 0]
Send the output of your Waveform
Generator subVI (Assignment 5) to the AO Waveform Gen.vi which is in
the Utilities sub-palette of the Analog Output palette. You will want
to set this VI up to continuously generate the selected analog output signal
on the appropriate analog output channel. Refer to the online
documentation for details about the AO Waveform Gen.vi. Controls
that you will have to wire include the generation count (not shown below),
device, channels, update rate, waveform data, and clear generation.
Once the above functionality is
working properly you may want to turn your VI into a simple one-state state
machine. You can have a button called "Update Analog Output"
that the user must press to cause the updated values to be written to the
analog output device. A
worksheet will be distributed in class that suggests various combinations of
the input parameters that you should try. Answer the questions that
are posed on this worksheet.
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