it makes signal, not get signal, if you mean the signal to stop it from receiving items like the normal hopper, not a problem, it makes signal and receives signal, and when it makes signal its just for 1 second.
This is really simple to do allready, but it would simplefy things even more if you like that. Just add a comperator next to the hopper and a repeater right after. If something is added the comperator sends out a redstone signal.
Awww yeeah.
HOW can this troll?
i didn't get your point, but this hopper could be slower than the normal one