Morse Code Machine – Sound

Build a morse code machine and send secret messages to your friends using beeps for words.

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things you will need

  • 1 x empty box
  • Coloured card, tape and scissors
  • 1 x buzzer
  • 1 x micro switch
  • 1 x red croc lead
  • 2 x black croc leads
  • 1 x 4AA battery pack (and batteries)
  • Printer to print morse code decoder – link below

All electronic components and battery pack can be found in the Discover + Play Circuits kit.

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1

Check the battery pack

Switch the battery pack OFF before you start.

2

Connect a red croc clip

Connect one red croc clip to the red wire on the battery pack.

3

Connect the buzzer

Connect the other red croc clip to the red wire on the buzzer.

4

Connect a black croc clip

Connect a black croc clip to the black wire on the buzzer.

5

Connect the switch

Connect the loose black croc clip to the pin on the switch labelled COM (this stands for Common).

6

Connect the switch to the battery pack

  • Take another black croc clip lead and connect it to the black wire of the battery pack and the switch pin labelled NO. 
  • Turn the battery pack ON and press the switch to hear the buzzer.
7

Prepare the box

  • Make a small hole in the front of the box to fit the wires attached to the buzzer.
  • Cut-out a small section on the top of the box to fit the switch.
8

Set-up your morse code machine

  • Place the circuit inside the box.
  • Push the switch through the opening in the box and secure the wires with tape.
  • Detach the buzzer from the circuit.
  • Place the buzzer wires through small hole on the front of the box, so the buzzer is on the outside.
  • Re-attach the buzzer wires to the circuit inside the box.
  • Make sure the battery pack is ON and close the box.
9

Attach the decoder

  • Download and print the decoder using the link below.
  • Cut-out the decoder and attach to the front of the box, so the alphabet is facing towards you.
1 0

Send your first message

  • Grab a friend or family member and to test out your morse code machine.
  • Did they decipher the message correctly?

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