Chocolate Egg Protector

Build an alarm to prevent your treats or chocolate from mysteriously going missing.

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things you will need

 
The following items from the Discover Circuits kit:
  • 1 x 4AA battery pack (and batteries)
  • Buzzer
  • 2 x black croc leads
  • 1 x red croc lead
  • Switch
  • Sticky tape (double-sided if you have it)
  • A jar with a lid
…and some of your favourite treats to protect. Yummy!
1

Connect to power

Connect one red croc clip to the red wire of the battery pack and one black croc clip to the black wire of the battery pack.

2

Add the switch

  • Connect the black croc clip attached to the battery pack to the pin on the switch labelled COM (this stands for Common).
  • Take another black croc clip lead and connect it to the pin on the switch labelled NC (this stands for Normally Closed).
3

Add the buzzer

  • Connect the red croc clip attached to the battery pack to the red wire of the buzzer.
  • Connect the black croc clip attached to the switch to the black wire of the buzzer.
4

Test it out

  • Turn the battery pack ON.
  • You should hear the buzzer loud and clear.
  • To stop the buzzer press down on the lever of the switch.
5

Set-up the alarm

  • Take the lid off the jar.
  • Attach sticky tape to the switch.
  • Secure the switch (with the lever facing upwards) to the inside of the jar, just below where the lid reaches when placed on top of the jar.
  • Turn the battery pack ON.
  • Place the lid on top of the jar.
  • The alarm should turn OFF when the lid is placed on the jar and turn ON when the lid is lifted off the jar.
6

Add the treats and WAIT!

  • Take the lid off the jar.
  • Add the treats that you would like to protect.
  • Place the lid on top of the jar.
  • You will now be alerted by the buzzer if anyone tries to help themselves.

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