Alan of alspix has come up with a nice a easy solution for creating a shutter to a pinhole camera – here is how he describes it (check out alspix blog for the most updated instructions):
Here's a couple of photos of the shutter I'm currently using. It's made from a couple of bits of scrap card. One has a quite large hole cut in the center which fits over the pinhole (I didn't cut this very neatly – you can do better!) The other piece acts as the shutter and slides behind this, covering the pinhole. I stuck some black tape on the back of this shutter card.
here is how it looks like:

You may also want to check out Matchbox Pinhole Camera and 35mm Sprocket Counter Clicker
check out alspix blog for the most updated instructions
FIND THIS INTERESTING? SHARE IT WITH YOUR FRIENDS!