Value Control with Variables

Value Controlwith Variables

Joe LongRobofest Student Assistant

Lawrence Tech Computer Science Major [email protected]

April 12, 2007

Create the variable Navigate to the ‘Edit’ menu (next to ‘file’) Click on ‘Define Variables’ Click ‘create’ and enter

the variable informationand type.

Click ‘Close’

Getting the light value Open the ‘complete’ block menu ( ) Find a Light Sensor block and drag it onto

the field.

Saving the value to a variable Find a Variable block and drag it onto the

field.

In the block’s options panel, change it’s Action to ‘Write’ and select your created variable from the List.

Make the Data Wires(light value saved to a variable) Click on the ‘tab’ sticking out of the light

block ( ), then click on the back ‘tab’ sticking out of the ‘write’ mode variable block

The wire should look like this:

Read the variable Drag another variable block onto the

field. In the options panel, select your variable

from the list and set the mode to ‘read’.

The block should look like thisWhen you are done:

Add 2 to the variable Find the ‘Math’ block and drag it onto the

field.

Draw a data wire from the second variable block to the ‘A’ tab on the math block:

Using the math block Open the math block’s options panel. Set the Operation to ‘Addition’ You can see that the space for ‘A’ is

grayed out, as it is already used. In the ‘B’ space, type in ‘2’

Convert the answer (number) to text for displaying Find the Number to Text block

Draw a data wire from the ‘#’ tab of the math block to the ‘#’ tab of the conversion block.

Displaying the value Find the Display block and put it on the

field:

In the display block’s options panel, set the Action to ‘Text’ (the location can also be experimented with)

The block should now look like this:

Displaying the value Open the display block’s drop down

menu (by clicking on the line at the bottom edge of the block)

Connect a data cable from the output of the converter to the‘T’ tab of the display block.

Display the data for 5 seconds Find a Wait block and drag it onto the

field:

In the options panel, set the Control to ‘Time’ and input 5.

CompleteSteps:

1. Read the light value2. Save it to a variable3. Do…. Whatever comes in-between…4. Read the variable5. Do any required math6. Convert the number to text7. Display the text8. Wait some time before continuing