Project Hub /Security Surveillance & Defense/Intrusion Detection Systems/How to build a Smoke and Fire Alarm System using Arduino with SMS Notification

Intermediate

ARDUINO

₹1,500 – ₹5,000

3 – 6 Hours

Partial Kit

How to build a Smoke and Fire Alarm System using Arduino with SMS Notification

Build an IoT-based fire and smoke alarm system using an Arduino UNO R4 and Cloud APIs to send real-time SMS alerts without requiring a GSM module.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

MQ-2 Smoke Sensor Detector Module Rs. 129.00
Piezo Buzzer (Big) 6-12V Rs. 45.00
10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Arduino Uno R4 / Minima
Flame Sensor

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How It Works

This IoT-based smoke and fire alarm system operates by continuously monitoring its environment for hazardous conditions using specialized sensing components wired to an Arduino UNO R4 WiFi board. The MQ2 smoke sensor detects combustible gases and smoke particles in the air, while the flame sensor uses an infrared receiver to spot open fire sources. Both sensors output analog or digital signals that the microcontroller evaluates. Under normal conditions, a green LED remains lit to indicate a safe state. When either smoke concentrations exceed a threshold or a flame is detected, the Arduino triggers immediate local and remote alerts. Locally, the green LED turns off, a red LED illuminates, and a 5V active buzzer sounds an audible alarm. Concurrently, the integrated ESP32-S3 module on the Arduino UNO R4 WiFi utilizes the WiFiS3 and Arduino_LED_Matrix libraries to connect to a local wireless network and transmit cloud-based API requests. This initiates a real-time SMS notification to a remote user without requiring a separate cellular GSM module, providing instant hazard awareness even when away from the physical setup. The entire circuit is assembled on a breadboard and powered via a stable USB power supply.

Why Build This

Design and deploy an end-to-end IoT safety monitor suitable for undergraduate engineering portfolios and smart-home applications.

Integrate hardware analog/digital sensing with cloud-based API communication to transmit remote wireless SMS alerts without dedicated cellular hardware.

Implement reliable multi-modal alerting strategies combining local audio-visual indicators (buzzers and LEDs) with cloud notifications.

Real-World Application

Home and office fire safety, early gas leak detection, industrial safety monitoring, and remote IoT hazard notification.

Skills You'll Learn

Microcontroller sensor interfacing

analog-to-digital conversion thresholds

IoT wireless connectivity integration

cloud API communication

digital logic state machine programming

Safety Precautions

Ensure proper wiring and power supply handling when dealing with sensors and buzzers. Test the gas and flame sensors in a controlled environment to avoid false alarms or accidental hazards.

Technology Tags

ARDUINO

IOT

WI-FI

CLOUD API

SMOKE SENSOR

FLAME SENSOR

HTTP REQUESTS

SENSORS

SMS ALERTS

Frequently Asked Questions

Do I need a separate GSM module to send SMS notifications?

No. The Arduino UNO R4 WiFi features built-in Wi-Fi capabilities, allowing it to connect to your local wireless network and communicate directly with cloud APIs to dispatch SMS messages.

How can I prevent false alarms during testing?

Test the MQ2 smoke sensor and flame sensor in a controlled, well-ventilated environment away from strong drafts or unintended combustion sources, and properly calibrate your code's threshold values.

Why are 220-ohm resistors included in the parts list?

The 220-ohm resistors are used in series with the red and green LEDs to limit forward current and protect the components from excessive current draw from the Arduino digital pins.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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