Light Curtain Safety Gate Kit with Arduino Uno – Build an IR Beam Alarm That Halts When Any Beam Breaks

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

From factory floors to home alarm systems, light curtains use invisible infrared beams to create a protective barrier. This kit turns that industrial concept into a working 3-beam sensor array with a real Arduino Uno at its heart. The moment anyone or anything breaks even one beam, the system triggers a stop signal — giving you a hands-on lesson in security sensing and array logic.

What You'll Build

You'll assemble a breadboard-based light curtain with three IR LED–photodiode pairs aligned as a detection zone. When all beams are unbroken, a status LED stays lit. Interrupt any single beam and the alarm LED turns off instantly, registering a breach just like the safety gates on CNC machines and automated doors. By the end, you'll have a working sensor barrier you can demonstrate and extend.

What You'll Learn

• Calibrating IR LED and photodiode pairs for consistent detection distance across all three channels
• Reading analog photodiode signals and setting thresholds with the LM393 comparator to reject ambient light
• Writing Arduino code that polls multiple digital inputs simultaneously and applies array logic to trigger a system-wide response
• Debugging beam alignment and false triggers with the serial monitor, building real embedded systems troubleshooting skills

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is ideal for school students (CBSE Class 7–10) exploring sensor-based electronics, ATL Tinkering Lab participants building safety systems, and young makers in STEM clubs who want a guided project that goes beyond blinking LEDs. It’s also a perfect starter for B.Tech ECE first‑years who need to understand comparator circuits and array logic with hands-on practice — a proven way to stand out in hackathons like Smart India Hackathon.

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.