How To Make A Projector? Here’s Our Answer

A projector is an optical device that projects an image onto a surface. It basically takes a picture and projects it.

The first thing that you should do is gather all the necessary materials. You will need a cereal box, some aluminum foil, a hole puncher, a compass, tape and some glue. 

There are many ways through which you can make your own projector. The projector is an excellent tool which can be used in different fields.

Building your own projector is a fun DIY project that you can do either by yourself or with the whole family.

Although it is not a professional projector and might not produce a perfect image, it gives a pretty nice result.

You can use it as a neat little gadget for your kid’s birthday party or create special effects for Halloween .

This project is a fun way for kids to learn about lenses and light and an excellent way to re-utilize materials.

Guide How To Make Projector At Home

What do you need: 

  • A big screen
  • An Android device or PC
  • A projector lens
  • Some tape or glue
  • A cardboard box for your projector
  • A stand for the projector
  • A table to mount everything on – A light source

Different ways to make Your Own Projector At Home

Step 1: Choose the Right Mirror and Box

To build this projector, we will place a mirror and a magnifying lens in a box to make the light rays coming from your phone create a bigger projected image.

The more light reaches the magnifying glass, the brighter your final image would be. For that reason, you want to have a relatively narrow box to avoid light dispersion before reaching the glass. 

You need a long box so that you can adjust the distance between the projecting lens and your phone. With that in mind, you need to use a box that your phone’s screen will fit across. In my case, I took a box 16x31x12 cm. 

Step 2: Black Out the Inside of Projector for Better Image Quality

Light reflecting off from the walls of the box would cause noise and can result in lower image quality .

To avoid that, you should make the inner sides of the projector black. You can coat the inside of the projector by glueing black matte paper.

Use a brush to evenly spread the glue so that the black paper is attached firmly to the box. If you prefer, you can use double-sided tape instead of glue. 

Step 3: Install the Lens 

Take the magnifying glass and remove its handle. Trace the outline of the magnifying glass on the centre of the narrow side you’ve cut out. 

Use the precision knife to cut out the outline so that the magnifying glass fits snugly in the opening you’ve made. 

Step 4: Making an Adjustable and Manual Focus 

Having an adjustable focus means we need to be able to move the lens in relation to the phone.

To achieve that, you need to construct a second box that will fit inside the outer box. Take the measurements of the inside of the box.

Create folds in 4 sheets of black paper so that they fit the edges of the box, use a ruler to create precise folds in the paper. 

Step 5: Installing the Mirror in the Cardboard

The lens projects images from the phone by concentrating and refracting the light. This means that the image we get on the wall is flipped upside down and left to right.

Fixing the first is easy. All you have to do is to deactivate the phone’s screen auto-rotate option and place the phone upside down. 

Place the mirror at a 45⁰ angle on against the side that is opposite of the lens. Check that when you look at the mirror from up, you can see the projecting lens. 

Step 6: Cut Out a Window for Your Smartphone

Measure the width and length of your phone’s screen. Draw a rectangle with your phone screen size on the lid of the projector, right above the mirror.

Fit the magnifying glass into the hole you cut out.

How Does A Home Made Projector Work?

The idea behind a projector is that light rays coming from your phone pass through a magnifying lens placed in a certain distance.

This creates a bigger projected image. This image will be inverted, but this can be fixed by placing a mirror between the phone and the lens.

Projector Why Is My Homemade Projector Image Upside Down?

The image of your homemade projector is upside-down when it is built with just one convex lens. The image will be inverted and enlarged.

Which lens Is Used In A Homemade Projector 

You need a convex lens to build a homemade projector. These lenses are bigger in the centre than on their edges. The easiest way to get a convex lens is to use a magnifying glass. You can remove the holder and place it in your projector. 

Projector How Do I make My Projector Screen Bigger?

Most projectors have a zoom ring to enlarge the image. If you have a homemade projector, you probably won’t have a zoom ring. The easiest way to make the screen bigger is by placing the projector further. You might need to readjust the focus by moving the phone back and forth. 

The Science Behind IT? 

How did the magnifying glass make the picture bigger? The answer is in the shape of the lens. 

The lens is convex, meaning its sides bend outwards. This allows it to catch, bend, and focus all the light from inside the box and project it onto the wall. 

The human eye has a lens similar to the magnifying glass attached to the projector. What the eye sees comes through the eye’s lens upside down but the brain learns to flip the image right side up. The magnifying lens flips the image through refracting the light from the phone’s screen just like your eye flips the light from the world. 

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