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Spy Kit: Motion Sensor Alarm

Need to protect your personal space? Signal if a sibling has been poking around in your room or keep out unwanted visitors by creating a working Motion Sensor Alarm!

The motion sensor alarm you will build is a circuit that uses a prefabricated sensor, called a PIR Sensor, to detect motion. If motion is detected, the circuit will trigger two different types of output, an LED and a Piezo Buzzer.

Before creating this circuit in real life, you will create a circuit schematic, which is like a circuit map. Engineers and designers use schematics to plan component and circuit layout.

Learning Objectives:

Introducing schematics as an engineering tool

Breadboard working circuit