Redstone

Is there any way to have a redstone circuit that's always on and touching a pressure plate or button turns it off?

Buttons are timed I believe.
Use a lever, it's an on-off switch. Stick with a stone under it.

You can set it next to a lever, and a button, leave the lever on, therefor activating the redstone, and when you press the button, for the moment it will shut off.

can i do that using a redstone torch instead of the button? I say this because there's a cave, with a secret entrance, and i wanna be able to push a button or whatever on the inside, go through the door, then leave and have it close behind me.

How can you move bricks? And if you want it to be automaticly closed, just use one button on each side of the door, or if torches can be de-activated and reactived, then use that.

I have sticky pistons with bricks attached to them, so when the circuit is on, the pistons are extended and the blocks are covering the entrance. But I only want to be able to open the door from the inside. A lever, i would have to turn off myself. buttons dont last long enough

Hm...
I can't think of anything else, as pads go down the second you step off of them...
Try looking for some redstone mods...

nah, I got it to work. you just gotta be super fast when leaving or it'll crush you haha.

Alright, kool!
But as for the crushing, can't do anything about it, unless you get super smart with the redstone and pull the floor away for a split second. :P

nah, it does half a heart damage, so, it's not bad.