Another great thing you can do with sensors is to skip large delays for TVs.

You see, usually when you program your macros, you put in a really long delay which gives your TV enough warm-up time to switch inputs. But if the TV is already on, there is no reason to have this delay.

I used a video sensor on the "video out" on my TV. Here is how my IF/THEN statement looks:

If Nevo video sensor
Then
Send TV
Delay 6500ms
Else

As you can see, with an IF/THEN statement like this, if the device is sensed Off, the power command and delay are executed (in my case, when the TV is off, it no longer sends a signal through the video out port and thus the Nevo video sensor knows that the TV is off). But, if the device is sensed On, then these commands are passed up.

This really helps for when someone is going from one activity to another. Meaning, if you hit your "Watch DVD" macro and after the movie finishes, you hit your "Watch Satellite" macro, you won't have to wait 6.5 seconds because if the TV is sensed on, the delay is skipped. This makes for a very seamless macro experience.