Value Control with Variables Joe Long Robofest Student Assistant Lawrence Tech Computer Science Major April 12, 2007

Create the variable Navigate to the Edit menu (next to file) Click on Define Variables Click create and enter the variable information and 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 blocks options panel, change its 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 this When 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 blocks 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 blocks 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 blocks 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.

Complete Steps: 1.Read the light value 2.Save it to a variable 3.Do…. Whatever comes in-between… 4.Read the variable 5.Do any required math 6.Convert the number to text 7.Display the text 8.Wait some time before continuing