How to make homemade spy gadgets for kids

Written by louise harding
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How to make homemade spy gadgets for kids
Make secret agent gadgets for children using inexpensive materials. (box secret image by haruspex from

Children love the excitement and secrecy of the world of pretend espionage. Making homemade spy gadgets for kids is affordable and a project that can involve the whole family or class. Using common, inexpensive materials, you can create spy gadgets for your children or pupils and inspire creativity and learning. Encourage children to research Egyptian hieroglyphics and other shapes or symbols for use in their own secret spy codes.

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Things you need

  • White paper
  • Pencil
  • 1 cardstock circle, 12.5 cm (5 inch) diameter
  • 1 cardstock circle, 7.5 cm (3 inch) diameter
  • Ruler
  • Scissors
  • 1 brad
  • Lemon
  • Knife
  • Cup
  • Eyedropper
  • Water
  • Spoon
  • Lamp
  • Cotton swab
  • Lipstick container - clean, empty

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    Secret code

  1. 1

    Write the alphabet onto paper leaving room beneath each letter to draw a symbol.

  2. 2

    Assign a symbol to each letter. According to Great Scott website, “Alphabet characters were the basis for hieroglyphic writings.” You’ll need to decide on 26 symbols, a lot less than the 2,000 hieroglyphs used by the Egyptians in ancient times. Encourage children to research hieroglyphs.

  3. 3

    Write a symbol beneath each letter. Write a message using the symbols representing letters. This is a secret code.

    How to make homemade spy gadgets for kids
    Assign a symbol to each letter in the alphabet. (hieroglyphes image by Loic LUCIDE from

    Secret code decoder wheel

  1. 1

    Center a 7.5 cm (3 inch) diameter cardstock circle on top of a 12.5 cm (5 inch) diameter circle. Lightly trace around the smaller circle in pencil.

  2. 2

    Measure 1.2 cm (1/2 inch) from the outside edge of the 7.5 cm (3 inch) circle and mark a pencil dot.

  3. 3

    Cut a 6 mm (1/4 inch) long by 6 mm (1/4 inch) wide square over the pencil dot. This is the viewer window on the decoding wheel. Look through this square to see the letter that corresponds to the symbol in your spy code.

    How to make homemade spy gadgets for kids
    The pencil dot marks where you'll cut the viewer window on the decoder wheel. (pencil image by AGphotographer from
  4. 4

    Center the 7.5 cm (3 inch) circle on top of the 12.5 cm (5 inch) circle. Poke the prongs of a brad through the centre of the two circles. Spread open the prongs on the back of the wheel.

  5. 5

    Write the alphabet, one letter at a time, in the viewer window, turning the wheel clockwise, until all 26 letters are beneath the 7.5 cm (3 inch) wheel.

  6. 6

    Draw the corresponding symbol assigned to each letter along the edge of the 12.5 cm (5 inch) wheel, above the letter seen through the viewer window on the 7.5 cm (3 inch) wheel. For instance, if you assigned a star to the letter F, the 12.5 cm (5 inch) wheel will have a star, and when you turn the viewer window beneath the star, you’ll see an F in the window.

    How to make homemade spy gadgets for kids
    Match the symbol with the letter to decode the secret message. (alphabet image by Blue Moon from

    Invisible spy ink

  1. 1

    Cut a lemon in half. Squish the lemon over a cup until the juice is drained. According to Science Kids, “Lemon juice is an organic substance that oxidises and turns brown when heated.”

  2. 2

    Use an eye dropper to add about three drops of water to the lemon juice. Mix with a spoon.

  3. 3

    Use a cotton swab as a “pen” by inserting the swab into the juice/water, and writing on paper. Allow juice/paper to dry.

    How to make homemade spy gadgets for kids
    Use a cotton swab as a "pen". (Cotton swab image by lefebvre_jonathan from
  4. 4

    Read the message by holding the paper next to the lamp’s light bulb. According to Science Kids, you can also make invisible ink from vinegar, orange juice, onion juice, honey and milk.

    Secret agent lipstick note holder

  1. 1

    Use a ruler to measure a 30 cm (12 inch) long by 2.5 cm (1 inch) wide rectangle of paper. Cut the strip from the paper with scissors.

  2. 2

    Write a message on the strip. Roll the strip into a coil.

    How to make homemade spy gadgets for kids
    Use a clean, empty lipstick container to hide secret messages. (lipstick image by Alex Karmanov from
  3. 3

    Insert the message into the lipstick and “smuggle” it to your secret agent. No one knows it’s really a secret message. It looks like an ordinary lipstick container.

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