Controls/Lab/Instrumentation

This page contains information related to the Instrumentation Basics and Simulink Lab for Controls. It has been updated for Spring, 2012.

Typographical Errors / Clarifications

• Due to timing issues, you will only actually be able to get through Assignment 2. Once you are finished with Assignment 2, be sure to transfer the files you need to your OIT account.

• For the initialization of MATLAB, when the first window comes up about platforms, click the "Do Not Ask Again" option and then click the RTI1104 button. If a window comes up about incompatible settings, select the do not ask again option, then Set Automatically. This should take care of the settings in the Simulink configuration for working with the dSPACE cards -- but you should still check the configuration as given on page Lab 3-11.

• With respect to Assignment 3 - you will complete that in lab next week.

Resources

• Relevant Pundit pages
  • dSPACE - which includes link to templates for DAC and ADC
• Files for the lab:
  • GetInstrumentData.m

Codes, Models, and Layout Images

Since you should never copy and paste text from a PDF (the quotes change and extra spaces are added), some of the code for the assignment parts will be included below. Also, there are pictures of the models and layouts that you will be building.

Assignment 1: RC Circuit Analysis

InitInstruments1.m

%% Initialize workspace
clear; format short e;

%% Sets global parameters
global Ts SR

% Defines sampling rate and - more importantly - sample time
SR = 1000;
Ts = 1/SR;

%% Opens and builds Simulink Model on dSPACE
ModelName = 'Instruments1'
open_system(ModelName)
rtwbuild(ModelName)

MakeInstrument1Handles.m

%% Select the board
mlib('SelectBoard', 'ds1104');

%% Define global variables for measurement and output channels
global ADC1 ADC5 DAC1 CONST
global Ts SR

%% Create handles to relevant blocks
ADC1   = mlib('GetTrcVar', 'Model Root/ADC1/In1');
ADC5   = mlib('GetTrcVar', 'Model Root/ADC5/In1');
DAC1   = mlib('GetTrcVar', 'Model Root/DAC1/In1');
CONST  = mlib('GetTrcVar', 'Model Root/C1/Value');

Assignment 2: Angular Measurements

InitAngMeasurement.m

%% Initialize workspace
clear; format short e;

%% Sets global parameters
global Ts SR

% Defines sampling rate and - more importantly - sample time
SR = 10;
Ts = 1/SR;

%% Opens and builds Simulink Model on dSPACE
ModelName = 'AngMeasurement'
open_system(ModelName)
rtwbuild(ModelName)

The following are links to larger images of the Simulink model and ControlDesk layout for Assignment 2 of this lab:

• 

  Simulink Model for Angular Measurements

• 

  ControlDesk Layout for Angular Measurements

Assignment 3: Voltage Control

• 

  Simulink Model for Voltage Control

• 

  ControlDesk Layout for Voltage Control

Questions

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External Links

• AMT 102 & 103 DIP Switch Resolution Settings from CUI.com via amtencoder.com.