EGR 103/DAQ 2

This page contains pictures and graphs related to DAQ 2 for EGR 103. It has been updated for Fall, 2011.

Notes

Possible Rate Issue With DAQ Cards

• DAQ 2-3: After you add two channels, you may receive the following:

Warning: This hardware could not support the requested value of 1000.00 for 
SampleRate. SampleRate has been set to 500.00.

Your program will still work, just slower. This is an issue with the drivers on some of the computers and does not represent a problem for this lab.

Pauses

There are pause commands in the code which will cause the program to...pause - specifically when the program first runs to check the lights. You will need to hit a key to un-pause the program. The way to see if the program is paused is to look at the bottom left corner of your MATLAB window - it will tell you if it is paused.

Graph Labels

For this particular assignment, you do not need axis labels. You need a title on each subplot, however.

Circuit for BasicAOutput

Circuit layout for BasicAOutput.

Circuit for BasicAIO

Circuit layout for BasicAIO (two measurements).

Graph from BasicAIO

Graph showing outputs when

Vout0 = 2.5+2.5*sin(2*pi*k/100);
Vout1 = 2.5+2.5*cos(2*pi*k/100);

That is,

\( \begin{align} V_{out,\,0}=2.5+2.5\sin\left(\frac{2\pi k}{100}\right)\\ V_{out,\,1}=2.5+2.5\cos\left(\frac{2\pi k}{100}\right) \end{align} \)

Circuit for AIO

Circuit layout for AIO (six measurements).

Graph from AIO

Graph showing outputs from six measurement channels.

Codes

Pasting codes from PDF files is...a bad idea. Here are the text versions of some of the codes in the assignment.

Example Commands to Parse Data Set for Small Green and Red LEDs

load SmallData
SmallGreenTotal = SmallVoltages(:,1);
SmallGreenRes   = SmallVoltages(:,2);
SmallGreenLED   = SmallVoltages(:,3);
SmallRedTotal   = SmallVoltages(:,4);
SmallRedRes     = SmallVoltages(:,5);
SmallRedLED     = SmallVoltages(:,6);

Subplot Structure for Plotting Code

The code below includes the commands for the small green LED assuming the variable names given in the code above.

subplot(3,2,1)
% small green plotting commands
plot(SmallGreenTotal, SmallGreenTotal, 'k-',...
     SmallGreenTotal, SmallGreenRes,   'k:',...
     SmallGreenTotal, SmallGreenLED,   'k--') 
title('Small Green LED')
grid on 

subplot(3,2,2)
% small red plotting commands

subplot(3,2,3)
% large green plotting commands

subplot(3,2,4)
% large red plotting commands

subplot(3,2,5)
% rect green plotting commands

subplot(3,2,6)
% rect red plotting commands

Questions

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