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!