Smoke Alarm with LCD
Build a Smoke Alarm with LCD Using Arduino — Beginner Kit for Gas Sensor Calibration
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Turn your room into a mini security lab. This kit lets you assemble a working smoke detector that reads airborne particles with an MQ-2 sensor, flashes a red alert, and shows the exact smoke level on a bright LCD screen. It’s the simplest way to understand how real-world safety alarms work while getting hands-on with sensor calibration.
What You'll Build
You’ll wire up a breadboard circuit with an Arduino Uno, connect an MQ-2 gas sensor, and program it to detect smoke concentration. A 16x2 LCD displays the real-time smoke level as a percentage. When the reading crosses a safe threshold, two red LEDs blink and an active buzzer screams—just like a commercial smoke alarm. The final gadget sits on your desk and can be adapted to detect LPG or methane.
What You'll Learn
- How to interface an MQ-2 gas sensor with Arduino and read analog smoke levels
- Calibrating the MQ-2 sensor for different sensitivities and alarm thresholds
- Displaying real-time data on a 16x2 LCD using I2C protocol
- Programming conditional logic to trigger an alarm when smoke exceeds safe levels
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MQ-2 Gas Sensor | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| Active Buzzer | 1 |
| 5mm Red LED | 2 |
| 10kΩ Resistors | 5 |
| 220Ω 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 kit fits perfectly into CBSE Class 11–12 electronics practicals, ATL Tinkering Lab safety projects, and B.Tech ECE/EEE coursework at institutes like IIT, NIT, VIT, and BITS. It’s also a great weekend project for Smart India Hackathon teams and curious 10‑year‑olds who want to build something that beeps and protects. The AI companion makes it possible for even a 5‑year‑old to follow along with an adult.
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?
The QR code inside the box opens an AI companion that guides you step-by-step. You can also WhatsApp us for a quick video call if needed.
What age group can build this kit independently?
With the AI companion’s visual instructions, kids aged 10 and above can build it with minimal supervision. Younger builders (5–9) may need a parent’s help with wiring.
Can I use this as a real smoke alarm in my home?
It is an educational prototype and not a certified life-safety device. However, it demonstrates how commercial alarms work and can be used for experiments in a controlled setting.
Will the MQ-2 sensor detect LPG or other gases?
The MQ-2 is sensitive to smoke, LPG, methane, butane, and alcohol. You can modify the code to calibrate for a specific gas and even log data to a serial monitor.
MQ-2 smoke sensor triggers alarm and shows smoke level on LCD. Intro to gas sensor calibration.
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