I constructed a phone projector made mainly from cardboard! This is a simple and fun project, and you can see pictures, videos, and movies anywhere and anytime with this build! (The pictures of the projection is not good quality, because the projection is not detected on the camera, but I promise you that it works!)

To make this cardboard projector, gather these materials:

Rectangular box – This will be used as the body of the projector (I used a 13 1/2″ by 6 3/8″ by 4 3/4″ box)
Cardboard – This will be used to make the phone holder
Marker, pen, or pencil – This will be used to make markings for the measurements
Magnifying glass – This will be used as the projector lens (I used one with a radius of 1 1/2″)
Ruler – This will be used to make measurements
Scissor – This will be used to cut pieces of cardboard
Box Cutter – This will be used to make cutting the cardboard a little easier
Hot Glue Gun – This will be used to assemble the cut cardboard pieces
Glue Sticks – This will be used to put in the glue gun
Foil – I used foil to surrounded the insides of the box to enhance the projection quality, but this is optional

https://www.instructables.com/Make-an-Easy-Homemade-Phone-Projector/