HW#19

Identify the DTMF tones of a cell phone dial buttons. I wasn't going to do this homework assignment, but Mundo had done it using a MATLAB script, so I did mine using MATLAB. There seems to be a problem with the variables going into the script. I can't figure it out but here are pictures of the wiring and the MATLAB script. There seems to be a problem with the MATLAB script outputting to a string variable.

This was a pretty fun assignment because we got to use a microphone and detect the different tones a cellphone uses.

Lecture 20

A VI to check the temperature of a chicken incubator. This also contains a subVI that will convert the temperature to degrees Fahrenheit upon command. The VI uses temperature probes to constantly check the temperature of the incubator and then sends a message to the front panel depending on if it's to hot or too cold.

Microphone testing:
I was not able to get the VI from Edgar, but I can describe what we did. We used different LabQuest Express VIs to filter out the sounds from the microphone. We tested it with our voices.

Edit: Thinking back, I am surprised we never used this feature again.

HW#18

Temperature VI that receives data from 2 temperature probes. The temperatures and an average is graphed. A beep plays for every data point. The higher the temperature the higher the frequency. Another addition is the passive-aggressive message box.

Debugging snaps:

Lecture 19

Ivan lent me his sister's laptop, but it's too small and slow so I'm still sharing with Edgar in class.

Practice: Case structures

You can type directly in MATLAB code using a MATLAB script
->Functions Palette->Mathematics->Scripts and Formulas->Script Nodes->MATLAB Script
Practice: MATLAB script

Boolean functions

Application: Volume in a Cylindrical Tank
[insert screenshots]

HW#17

Question 1 and 2: Using a case structure to change the graph to cosine, sine, tangent, and cosecant.

Question 3: Calculating frictional factor using Reynolds number.

Lecture 18

Data types in LabVIEW

Practice: Voltage Divider
Creating a Voltage VI with graphics on the front panel.

Practice: Controlling User Input
Solving for volume using the ideal gas law. Editing maximum values to prevent the user from going past a certain point. Select "coerce" next to the maximum value in the properties window to stop the knob from going past the maximum value.

Practice: Creating a SubVI
Bundles, arrays, and graphs

Practice: Exponential Growth

HW#16

First LabVIEW homework. All VIs are done in while loops.

Question 1 & 2: Binary

Question 3: Root and square root

Question 4: Quadratic formula

Lecture 17

Today we moved on to LabVIEW. My laptop is dead, so I could not bring it to work on. I will be observing classmates' experiences with LabVIEW.LabVIEW is a lot more visual and user-friendly than MATLAB. I like the visual aspect of it but it doesn't seem like we will be doing much coding (which is what I am primarily interested in). Because I cannot take screenshots, I will be typing solutions and explanations to the practice exercises here. Start a new VI (visual instrument).

Edit: I'm sharing a laptop with Edgar so I can have screenshots now.

Practice exercise: familiarizing with the functions palette
Add -> functions palette -> Numeric group
Wait -> functions palette -> Timing group
Dial numeric control -> Numeric group
Toggle switch -> Boolean group

Creating a VI: build a simple VI that has a toggle switch with an LED indicator that illuminates when the switch is "on".
First drag a light LED and a toggle switch to the front panel. Connect the two with a wire and run continuously. There are alignment options at the top of the front panel. AND/OR can be used for these "wires". Input goes into the back and output goes out the front.

Creating a Division VI; Using while loops:

Project 2 Discussion

Today we turned in Project 2 and had a discussion about criticisms of and improvements for the assignment. Our group estimated that the time it took was 20 - 24 hours. We learned that you should start on a project as soon as you receive it. Also talk to your colleagues for feedback and new perspectives. Below is a picture of the whiteboard we worked on. It lists the steps of this project, what could be improved, and what we learned.

Project 2 Code and Raw Data

http://www.megafileupload.com/i0r3/proj2.zip