Alarms have been used throughout history to alert and/or warn people of various situations, e.g., intruders, a fire, gas leaks, severe changes in weather. Although many complex alarm systems today are managed by computers and some even involve AI technology, a simple alarm system requires a detector of some sort to cause the state of an electrical circuit to change. When you build this kit, you will be creating a simple electrical circuit which uses a magnet to activate the alarm (a buzzer and an LED) and a pushbutton to reset the circuit. Once finished, you could attach it to the door of the cupboard where your favourite snacks are kept!

Project links: - Transistors and semiconductors - Simple circuits - Sound energy

Click here for our YouTube instruction video.