Covert Audio Logger Kit with Arduino Uno + LED
Covert Audio Logger Kit with Arduino Uno — Build a Stealth Sound-Activated Recorder for Security Monitoring
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
This kit lets you build a covert audio surveillance device that springs to life the moment noise exceeds a preset level. It captures ambient audio with a sensitive MAX4466 mic, stamps each recording with the exact date and time from a DS3231 real-time clock, and saves the file to a microSD card — all while a 0.96-inch OLED display shows system status. Ideal for monitoring a secured lab, recording evidence of tampering, or adding an invisible security layer to any space.
What You'll Build
You'll assemble a battery-powered, low-profile audio logger that can sit silently in a room for days, waking only when sounds cross your set threshold. The recorded .wav files are timestamped to the second, so you can correlate events with CCTV footage or manual logs. The kit includes a 1000 mAh LiPo battery and charging module, so the device stays operational even during power cuts.
What You'll Learn
- Designing an interrupt-driven audio recording system
- Integrating a real-time clock for timestamped file storage
- Managing power with a LiPo battery and TP4056 charger module
- Programming sound threshold detection and finite state machine logic on Arduino
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MAX4466 Mic Amp | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 3.7V LiPo 1000mAh | 1 |
| TP4056 Module | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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
This kit is designed for advanced engineering students and security hobbyists who need a production-grade sensor project. Whether you're a B.Tech ECE student working on an embedded systems final-year project, a Smart India Hackathon participant prototyping a surveillance solution, or a cybersecurity enthusiast adding evidence logging to your home setup, the pre-assembled codebase and hardware integration save you weeks of debugging.
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 to instantly chat with the AI build companion, which knows every wire and line of code. For deeper troubleshooting, our team is available on WhatsApp within hours.
Can I extend this kit to record video alongside audio?
This kit focuses on audio logging, but the Arduino Uno’s remaining digital I/O pins can be used to trigger a camera module or relay; we provide circuit diagrams for optional expansions in the build guide.
How long can the battery last in standby?
With threshold-based activation, the logger draws under 2mA in sleep mode, lasting up to 5–7 days on a full 1000mAh charge, depending on recording frequency.
Can I replace the MAX4466 with a different microphone?
The build is optimised for the MAX4466’s adjustable gain and low noise, but you can adapt other analog mic modules by adjusting the threshold code; our AI companion can guide you through calibration.
MAX4466 records ambient audio to SD card with RTC timestamps. Activates only on sound above threshold.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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