Use property nodes to change the state of a boolean through time

I want to be able to switch the value from a boolean control, using property nodes, so that if the time elapsed is equal to 0,1 ,2 ,3 s, it should be false and if the time is equal o.5,1.5,2.5 s, the value should be true.
Can some one tell me how to do this with propert nodes or with any other method?
Thanks in advance!

-Check this link for ideas on how to make loop run for specific period of time.
http://forums.ni.com/t5/LabVIEW/how-to-make-a-loop-run-for-specific-period-of-time/td-p/1641018
-To change value using property node>>right click boolean>>create>>Property node>>value>> Change it to write.
-Forget about specific period of time, first learn to change the value of boolean programmatically.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

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