Here's my new prop for this season. Its run with a Picoboo plus controller that starts up a fog machine for a second then activates a pneumatic cylinder that produces a vortex ring out the end. Will upload videos soon.
I'm using three outputs. one for the fog machine, one for the pneumatic cylinder and there's one for a white led light that comes on when the cannon fires out the end. I wanted the red light to stay on to help the cannon seem alive then go to white when it fired. thanks for the comments.
I would love to see the internal workings of this. I have been planning on building a Civil War era cannon for a couple years. I originally was going to use an air cannon to push the fog out the barrel, but I like the pneumatic cylinder powered vortex idea.