Step 11

Now press down gently on the top of your sandwich. When the two sides of foil touch each other in the middle, your LED light should turn on! Why do you think this happens?

Hand pressing down on the top of the circuit switch, with the LED turning on.

If your LED does not turn on, try the following fixes:

  1. Check where all your cables are connected. Make sure they’re touching foil, play-doh, or the LED legs tightly.
  2. You may have to switch the alligator clips on the LED legs.
  3. Now that you’ve got a working switch, play around spelling words in Morse code. Check the inserted Morse Code letter guide.

Check out this video on Morse Code to get started:

Concerning Reality – How Does Morse Code Work?