Hidden Safe IR Beam Kit with Arduino Uno + LED
Build Your Own Hidden Safe IR Beam Alarm with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Keep your secrets safe with a working alarm that screams the moment a curious sibling or intruder opens your safe while you’re away. This kit places an invisible infrared beam across the safe opening – when the main door is locked and someone tries to slip inside, the beam breaks and a buzzer shrieks instantly. You’ll mount an IR LED and photodiode on opposite sides, wire them to an LM393 comparator, and program an Arduino Uno to trigger the alarm only when the door is truly closed. It’s a real security gadget you can deploy at home, in a school locker, or as a live demo for your next science exhibition.
What You’ll Build
You’ll assemble a battery-powered hidden safe monitor that fits neatly inside any cupboard, locker, or strongbox. The IR beam stays invisible to the naked eye, so tamperers won’t notice it until the buzzer sounds. By coding a simple logic check, the Arduino ensures the alarm doesn’t go off just because you opened the main door – it only reacts when the door is locked and the beam is broken. The final device teaches you how professional security systems use light beams to guard vaults and how comparators turn analog sensor signals into digital alerts.
What You’ll Learn
- How infrared LEDs and photodiodes detect interruption in a light path
- Using an LM393 comparator to convert analog sensor readings to a digital trigger
- Programming conditional logic in Arduino IDE to check lock status before sounding an alarm
- Breadboarding a real-world sensor circuit with resistors, jumper wires, and a 9V power supply
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| IR LED | 1 |
| IR Photodiode | 1 |
| Active Buzzer | 1 |
| LM393 Comparator | 1 |
| 220Ω Resistors | 5 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 15 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Perfect for young tinkerers aged 5-15 who want a tangible security gadget they can use right away. CBSE Class 11-12 physics students can demonstrate infrared optics and comparator circuits, while ATL Tinkering Lab participants and Smart India Hackathon junior tracks will find it a fast, self-contained project. B.Tech ECE first-years at VIT, NIT, or BITS often use this exact kit to grasp sensor integration before moving to advanced embedded systems. It’s also a great parent-child weekend build that ends with a working burglar alarm for the home locker.
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.
What if I get stuck during the build?
Scan the QR code on the box and our AI companion will walk you through the exact wiring and code, step by step. If you prefer a human, WhatsApp us — a real mentor replies within hours.
Can this work without an Arduino board?
The kit uses an Arduino Uno R3 to read the comparator output and manage the lock/unlock logic. You could replicate it with a standalone comparator, but the Arduino makes it programmable and easy to adapt later.
Will the IR beam work in daylight or a bright room?
Yes, the LM393 comparator is tuned to detect the specific IR modulation, so ambient light won’t cause false triggers. You can even demonstrate it near a window.
How do I know if the main door is locked?
You’ll connect a simple switch or magnetic reed sensor (not included but easily added) to one of the Arduino’s digital pins, then code the alarm to activate only when that pin reads HIGH (door closed). The instructions show exactly how.
IR beam across safe opening triggers buzzer if tampered while main door is locked.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items