Variable Op
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Variable Op






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    Variable Op Variable Op Presentation Transcript

    • Value Control with Variables Joe Long Robofest Student Assistant Lawrence Tech Computer Science Major [email_address] 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 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 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 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.
    • Complete
      • Steps:
        • Read the light value
        • Save it to a variable
        • Do…. Whatever comes in-between…
        • Read the variable
        • Do any required math
        • Convert the number to text
        • Display the text
        • Wait some time before continuing