USING THE CALCULATOR BASED RANGER (CBR) WITH A TI-83+



USING THE CALCULATOR BASED RANGER (CBR) WITH A TI-83+ and/or 84+

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by James P. Dildine (slightly edited by George Reese)

The CBR is a distance sensor that acts much the same as a submarine or bat to determine its location with respect to an object (it sends out sound waves then determines the time it takes for them to hit the object and bounce back, thus giving its location, or distance from the CBR).

SET-UP

First, make sure there are “good” batteries in the two devices (4 AA batteries for the CBR and 4 AAA batteries for the TI-83+) and then connect the two devices using the TI link cable. As shown here. Important Note: Make sure that the cables are all the way in each device (you should hear an audible “click”, indicating they are in securely)

[pic] .[pic]

The keys we will be using are circled in the graphic below:

[pic]

For this activity, we will not use EasyData, though it can also be used with the CBR. The CBL/CBR application allows real-time graphing, so we prefer it for this activity.

To begin, turn the calculator ON by pressing the ON key. [pic] located at the bottom left. Then press the [pic]APPS key to get the following menu. From this menu we

want to choose CBL/CBR (as circled) by using the arrow keys [pic] (or the number it is assigned to, in this case “2”) to highlight the CBL/CBR option and pressing ENTER

You will then see the following screen, so hit any key and you’ll get the next screen.

[pic] then [pic]

Choose the Number 3:RANGER option by arrowing down or pressing the “3” key.

You will then see the following menu:

[pic]

Press ENTER and you’ll view the following menu.

[pic]

Now, we have a couple of options.

First, we can choose to create our own graphs with the CBR:

We choose option 1:SETUP/SAMPLE and press ENTER and we are presented with the next menu.

[pic]

We want to set the following options (pressing ENTER allows you to choose from each possible option):

REAL TIME: YES – This means we can see our graph as we make it

TIME(S): 15 – We can change this but real time mode restricts us to 15 seconds

DISPLAY: DIST – This changes the type of graph we see (DIST v. TIME, ACCEL v. TIME, and VELOCITY v. TIME) the clearest graph is DIST

BEGIN ON: [ENTER] – We can choose the CBR trigger option but [ENTER] is easier.

SMOOTHING: MEDIUM – Presents our graph in a more readable manner (taking out extraneous points)

UNITS: METERS – Science types always use the metric system – you can choose feet if you’d like.

Then we arrow up to START NOW and hit ENTER

To get the next screen, follow the directions presented.

[pic]

Your target can either be a wall (if you are holding the CBR) or if you are not holding the CBR it can be pointed at you. I pointed the CBR at a wall and walked back and forth producing the following graph. Think about what the graph looks like (we’ll explore later).

[pic]

After creating your first graph press the [ENTER] key and you’ll be presented with the following options.

[pic]

1: SHOW PLOT – Allows you to view the graph again

2: SELECT DOMAIN – Allows you to analyze a specific portion of the graph

3: REPEAT SAMPLE – Allows you to create a new graph

4: MAIN MENU – Brings you back to the main/setup menu

5: QUIT – Quits the CBR program

Additionally we can use built in programs to explore graphs. Notably, the MATCH-THE-GRAPH activities. When you are at the main menu:

[pic]

Choose 3:APPLICATIONS

And you’ll get a menu like this

[pic] Choose your measurement units. Then you’ll see this menu.

[pic] Choose 1: DIST MATCH. Then you’ll see something similar to this (or another type of graph).

[pic] [pic]

The idea is to try and use the CBR and your motion to create a graph similar to the graph presented to you.

My (feeble) attempt at the graph shown above is shown here (the dotted plot is my graph). I recognized that I needed to start about 2 meters from the wall. I then saw that I should move away from the wall, not too quickly, then stay still for about 5 seconds, and then move toward the wall, again not too quickly, but quicker than I moved away from the wall.

[pic]

Press the [pic]ENTER key to view the menu below:

[pic]

You can perform the same match, a new match, or return to the main menu, or quit.

Try several matches to get a few different sets of movements needed to match each graph.

ACTIVITIES TO TRY

After you master the Match-the-Graph activities you should attempt to create and match your own graphs. Swapping with a partner is a fun way to do this.

Some graphs you may want to try are presented here (with space to describe how you created them or cannot create them) making note of speed and location from the wall or sensor:

1. [pic] Explanation:

2. [pic] Explanation:

3. [pic] Explanation:

4. [pic] Explanation:

Then, use the following template to draw your own graph and have a team-mate create it with the CBR

[pic]

Finally, here is a series of graphs that represent sinusoidal functions (I have shown you something similar earlier in this document):

[pic] [pic]

Describe as many different ways as possible to create this type of graph with the CBR.

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