Picture of Secret Message Light Box
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My 7th graders love to make things and we just got a 3D printer, so I came up with this light project. It's a small box with a design cut out from the inside, almost all the way through. When you shine a light from inside you see the design. When you turn it off, it's hidden! Cool!
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Step 1: What You Need

Picture of What You Need
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Here is the list of materials:
Of course first you will need a 3D printed box. I will not explain that in this Instructable, but I can say we used Tinkercad and made boxes about 40mm x 40mm x 30mm high, with 2mm sides, a 5mm bottom, and the shapes in the bottom cut down to make those areas 1mm thick. That lets a good strong light through nicely, while hiding it with no light.

To make the light switch:
2 pc. of cardboard, one 4" x 2", the other 2" x 2"
A 3v coin cell battery
A bright white LED
One red and one black wire, about 2" long
A Ping pong ball
Assorted Legos
Tape, masking is fine
Hot glue

Tools you will need:
Wire cutters/strippers
Basic soldering stuff

Step 2: Prepare The Base

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Fold the smaller piece of cardboard in half. Cut a hole in the crease for the wire to go through. Now tape it on the longer piece so the open side faces away from the middle.

Step 3: Prepare The LED

Picture of Prepare The LED
Strip a small bit of insulation off of the ends of the wire. Solder the red wire to the longer leg of the LED and the black wire to the short leg. Melt a blob of solder onto the other end of the black wire. This will be the switch contact.

Step 4: Wire In The LED

Picture of Wire In The LED
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Poke a hole through the top of the bent cardboard. Push the black wire through so the solder blob sticks out. You can bend it down a little to stay.

Put the red wire through the cut hole in the crease. Tape it down.

Bend the LED up close to the light, being careful not to bend it around too much or it could break off. Tape it down nice and flat with the LED sticking up.

How long does it take your 7th graders to make one of these boxes?

tmartin371 year ago