Build a projector with a smartphone - how it works

You can easily build a projector with your smartphone. Read in this practical tip how this works.

Building a projector with a smartphone - you need that

• carton
• Black cardboard or black spray
• Black tape
• Cuttermesser
• tongs
• wire
• magnifying glass

Build a projector with your smartphone - this is how you proceed

1. Start by darkening the inside of the box with the black cardboard or the black spray from the inside, so that no light can enter.
2. Use the cutter knife to cut a hole in one end of the box that is large enough for the magnifying glass.
3. Then attach the magnifying glass to the hole with tape. Make sure that no light can get through the opening here either.
4. Use the wire to build a holder for your smartphone so that it sits firmly. Before doing so, turn off the automatic display rotation on the smartphone and set the brightness to 100%.
5. Put the cell phone with the holder in the box with the screen for a magnifying glass and switch off the light in the room.
6. If the image is still out of focus, change the distance between the smartphone and the magnifying glass.
7. The physicist Philip Häusser gives you detailed instructions in this video.

In the next practical tip, we will tell you how to connect your Android smartphone to a projector.