Arduino Reed Switch Starter Kit: Build a Magnetic Door Alarm in 1-2 Hours

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine a security system that buzzes whenever your cupboard door is left open. This kit lets you build that exact project - a magnetic door sensor alarm - using an Arduino Uno, reed switches, LEDs, and an active buzzer. No soldering, no complex programming; just plug components into the breadboard and watch a simple circuit turn into a working alert system. Perfect for school assignments or a weekend electronics exploration.

What You'll Build

You'll create a functional alarm that lights up a red LED and sounds a buzzer when a magnet moves away from the reed switch - just like a real door sensor. Mount the reed switch on a door frame and the magnet on the door, then close the circuit. When the door opens, the Arduino detects the change and activates the alert. Use the green LED to indicate the protected state, and understand how a tiny magnetic component can power a big idea.

What You'll Learn

• How a reed switch opens and closes in the presence of a magnetic field
• Wiring a simple sensor circuit on a solderless breadboard
• Controlling multiple LEDs and a buzzer with Arduino digital outputs
• Writing conditional logic in Arduino to trigger an alarm based on sensor state

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Children aged 5-15 will enjoy seeing a physical reaction to a magnet, guided by a parent or teacher. It's an ideal pick for ATL Tinkering Lab activities, CBSE Class 6-10 science projects, or a first hands-on step into electronics. Even B.Tech ECE/EEE freshers at NITs or VIT benefit from a quick, working demo of sensor integration without the hassle of sourcing parts.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project - accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.