Baby Cry Detector Pro Kit with Arduino Uno + Sensor
Baby Cry Detector Pro Kit: Arduino Smart Nursery Light That Responds to Your Clap
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 nursery light that turns on when your baby cries, and then switches off with two quick claps — without you ever touching a switch. This kit turns that idea into a real working circuit. Using an Arduino Uno and a sensitive KY-038 microphone, the system listens for crying sounds, activates a relay to switch on a lamp, and waits for your double-clap command to turn it off. It’s a practical, everyday electronics project that blends sound detection with home automation, built entirely on a breadboard.
What You'll Build
You will assemble a fully functional sound-activated relay system that connects to any lamp or night light. Once powered, the microphone constantly monitors for crying; a sustained sound above a configurable threshold triggers the relay. A double clap within a short window toggles the relay off, giving you hands-free control. The project runs on a 9V battery, making it portable and safe to place near a crib.
What You'll Learn
- How to wire a sound sensor and read analog signals with Arduino
- Programming logic to distinguish sustained crying from short noise bursts
- Controlling a 5V relay to switch a mains-powered lamp safely
- Implementing a double-clap detection algorithm using timing and thresholds
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| KY-038 Sound Sensor | 1 |
| 5V Relay Module | 1 |
| 5mm LED | 2 |
| 1N4007 Diode | 3 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 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
This beginner-friendly kit fits perfectly into ATL Tinkering Lab activities, CBSE Class 11-12 electronics practicals, or a parent-child weekend build. It’s also an ideal hands-on introduction for B.Tech ECE/EEE first-year students exploring sensor integration. No prior coding experience is needed — the AI companion walks you through every line of the Arduino sketch.
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 reach the AI companion trained on this kit; it offers real-time troubleshooting. If needed, send a message on WhatsApp and our team will guide you within a few hours.
Can this project truly detect a baby crying, or does it just react to any loud sound?
The microphone reacts to sound intensity, so a sustained cry above a set threshold will trigger the relay. While it cannot distinguish between a cry and a loud clap, the double‑clap toggle logic ensures the lamp stays on only when you want it — you can adjust the sensitivity pot on the sensor to tune out ambient noise.
Is the relay safe to use with a table lamp or night light?
Yes, the 5V relay module is optocoupler-isolated and rated for up to 10A at 250V AC. Wiring the lamp through the relay’s COM and NO terminals keeps the low‑voltage Arduino circuit completely separate. Always have an adult supervise mains wiring, as instructed in the project manual.
Does this kit work without a computer once programmed?
Absolutely. After you upload the code via USB, the Arduino Uno runs the program independently from a 9V battery. You can place the whole setup anywhere in the nursery — no laptop required for normal operation.
Baby Monitor — Double clap detected by microphone toggles relay-controlled lamp.
What's in this kit
- Arduino Uno R3
- KY-038 Sound Sensor
- 5V Relay Module
- 5mm LED x2
- 1N4007 Diode x3
- 10kΩ Resistors x5
- 400-pt Breadboard
- M-M Wires x20
- 9V Battery Snap
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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