1. GATHER MATERIALS
Find a light-tight box, some photo paper, a thin piece of metal (ex. can or brass shim), some tape, an xacto knife, a needle, and some sandpaper.

2. MAKE THE PINHOLE
Since the pinhole acts as the lens of the camera, this is a very important step. With a needle, carefully poke a tiny hole into the brass shim. Then, sand it smooth with with a piece of sandpaper. Afterward, trim the brass shim so that there isn’t too much space around the hole.

3. MAKE THE CAMERA BOX
Seal the box and paint it a flat black color. Then, cut a small, square opening in the light-tight box (shoe box, oatmeal box, etc.) for the pinhole to be placed in.

4. PUT IN PINHOLE AND MAKE THE SHUTTER
Tape the pinhole behind the opening you just cut out of the camera box and make sure the pinhole is centered. Next, make the shutter (a flap that covers the pinhole from the outside) out of some tape.

5. LOAD THE PHOTO PAPER
This step MUST be done in complete darkness (EXTREMELY IMPORTANT). Tape the photo paper on the side of the box that is directly across from the hole. Put the lid on top of the box and make sure that the shutter is closed. Then, you may go out in the light with the pinhole.

6. TAKING A PICTURE
Choose what you would like to shoot, and then point the camera in that direction. Hold the shutter open for as much time as needed depending on the lighting that day (ex. cloudy or sunny weather affects the amount of time the picture should be exposed to the light). While taking the picture, make sure the camera is perfectly still or else the image will come out blurry. Finally, go back to the dark room and take out the picture to develop.

Site used: http://www.instructables.com/id/How-To-Make-A-Pinhole-Camera/