Hidden Safe IR Beam Variant 31 Kit with Arduino Uno + LED
Build a High-Security Hidden Safe with an Arduino IR Beam Alarm
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 diary, a coin collection, or a secret gadget stash protected not by a visible lock, but by an invisible beam of light. The moment an unwanted hand breaks that beam inside your safe box, a piercing alarm shrieks. This kit turns that spy-movie scenario into a working circuit on your table before you install it into any box you choose. The core of the project is a reliable IR beam that sits across the inner boundary of your safe opening, armed only when the main door is closed.
What You'll Build
You will assemble a standalone alarm system that you can embed into any household box to create a personalized secure compartment. The final build includes a long-range infrared beam spanning the safe’s opening, an LM393 comparator to generate a stable switching signal, and an active buzzer that sounds instantly when the beam is broken. The circuit operates from a 9V battery, making it completely portable and independent of your safe’s existing structure.
What You'll Learn
- Align an IR LED and photodiode to create a reliable invisible tripwire
- Configure an LM393 comparator to generate a clean digital signal from an analog sensor
- Wire an active buzzer as a direct alarm indicator triggered by a sensor event
- Program an Arduino Uno R3 to read a digital input and control an output in real-time
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | x1 |
| IR LED | x1 |
| IR Photodiode | x1 |
| Active Buzzer | x1 |
| LM393 Comparator | x1 |
| 220Ω Resistors | x5 |
| 10kΩ Resistors | x5 |
| 400-pt Breadboard | x1 |
| M-M Wires | x15 |
| 9V Battery Snap | x1 |
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
This beginner-friendly surprise alarm is built for curious minds between ages 5 and 15 and fits perfectly into CBSE Class 6-10 science curriculum or ATL Tinkering Lab sessions at schools. It also serves as an engaging first Arduino project for B.Tech ECE and EEE students at IIT, NIT, VIT, or BITS who need a quick, working prototype for a mini project or Smart India Hackathon demo. Parents guiding a child’s first electronics build at home will find the guided support exactly what they need.
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 your kit’s box to start a session with the AI companion trained on this exact IR beam safe project. If you prefer a human hand, our WhatsApp support team is also ready to guide you.
Can I use this on a real safe box at home?
Absolutely. The circuit is designed to be mounted inside any box with a lid or door. You position the IR LED and photodiode across the interior of the opening so the beam breaks whenever the box is accessed while the circuit is armed.
Will the alarm trigger if the safe door is opened by me?
You can add a hidden master switch or code the Arduino to arm the system only after a delay. This way, the alarm ignores your own entry and only activates when an unexpected breach occurs.
Can I extend the IR beam range for a bigger safe?
Yes. The LM393 comparator and the adjustable sensitivity allow you to tune the photodiode’s response. For spans wider than 30 cm, a slight repositioning of the LED and photodiode is all it takes.
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