A variable is
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Run Button ^ |
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Type the procedure on the right into the Procedure window and type test into the Run This line, or . Then click Download and the Cricket's Run Button. The trick is the statement waituntil [not switcha]. Notice the not command—this makes the Cricket wait until the switch is released. So, the first waituntil [switcha] will wait until you press the switch; then the following waituntil [not switcha] waits for you to release it. Then the Cricket beeps. This repeats a total of 3 times, and then the Cricket turns on the motors for 3 seconds. |
to test waituntil [switcha] waituntil [not switcha] beep waituntil [switcha] waituntil [not switcha] beep waituntil [switcha] waituntil [not switcha] beep onfor 30 end |
Suppose you wanted 5 button presses before the motors turn on—can you re-write the procedure to be shorter?
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Suppose you didn't use the not command, and you had a program
like this (on the right). Would this work? Why or why not? (You can
type it and try it.)
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to test waituntil [switcha] beep waituntil [switcha] beep waituntil [switcha] beep onfor 30 end |