Baby Cry Detector Kit with Arduino Uno + Sound Sensor
Baby Cry Detector & Clap-Controlled Robot 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.
Imagine a baby monitor that not only alerts you when your little one cries, but also lets you command a patrolling robot with a simple clap. This kit turns that idea into a working Arduino project. Using the KY-038 sound sensor, you’ll program interrupt-driven responses that distinguish a baby’s cry from background noise and react to clap sequences — stop, start, or steer the robot without touching a single button.
What You'll Build
A complete 2WD robot on a custom chassis that listens for sound events. The onboard sound sensor continuously monitors; when it picks up a cry above a calibrated threshold, the robot stops near the crib and stays alert. With a double-clap, it resumes patrolling; three claps make it turn around. The entire system runs on two 18650 cells, giving you a portable, rechargeable baby monitor robot that demonstrates real-world interrupt handling.
What You'll Learn
- Programming Arduino hardware interrupts to respond immediately to sound events
- Calibrating the KY-038 sensor threshold to tell a real cry from ambient noise
- Driving DC motors with the L298N motor driver and differential steering
- Assembling a 2WD chassis, wiring a castor wheel, and powering everything with 18650 lithium cells
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| KY-038 Sound Sensor | 1 |
| L298N Motor Driver | 1 |
| TT Gear Motor | 2 |
| Castor Wheel | 1 |
| 2WD Chassis | 1 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 5 |
| 18650 Cell | 2 |
| 18650 Holder | 1 |
| M-M Wires | 20 |
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
Designed for CBSE Class 11-12 students exploring sensors in physics or computer science, first-year B.Tech ECE/EEE learners prototyping sound-activated systems, and ATL Tinkering Lab tinkerers building for Smart India Hackathon. Even a 10-year-old can follow the clear instructions — no prior coding or electronics experience needed.
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 talk to the AI companion that knows this kit inside out, or reach us on WhatsApp for a personal response within hours.
Can this really detect a baby cry, or is it just clap-based?
Yes — the KY-038 sensor is sensitive enough. The included tutorial shows you how to use an interrupt and threshold calibration so the robot reacts only to sustained high-volume sound patterns like a cry, not random noise.
Does the kit need any soldering?
No soldering at all. All connections use the M-M jumper wires and breadboard-style mounting, making it safe and easy for young builders.
How long can the robot run on the provided batteries?
With two 18650 cells, the robot patrols for roughly 1.5–2 hours on a full charge. A basic USB charger for 18650s (not included) is all you need.
Baby Monitor — Sound sensor detects claps to start, stop, or turn the robot. Teaches sound-triggered interrupt logic.
What's in this kit
- Arduino Uno R3
- KY-038 Sound Sensor
- L298N Motor Driver
- TT Gear Motor x2
- Castor Wheel
- 2WD Chassis
- 10kΩ Resistors x5
- 100nF Caps x5
- 18650 Cell x2
- 18650 Holder
- M-M Wires x20
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