Build a Fire and Smoke Alarm with Arduino and SMS Notification

In this DIY project, we’ll show you how to build a smart fire and smoke alarm system using an Arduino UNO R4 Wi Fi, MQ2 gas sensor, flame sensor, and SMS alert functionality. This setup not only detects fire and smoke but also sends real-time SMS alerts to your phone, making it ideal for homes, offices, or small industrial spaces.

How the System Works

This project relies on two key sensors:

• MQ2 Smoke Sensor: Detects smoke or combustible gases like LPG, butane, methane, or hydrogen.
• Flame Sensor: Detects the infrared light emitted by flames.

The Arduino continuously monitors these sensors. When it detects a fire or smoke condition, it activates a buzzer and LED indicators (green for normal, red for alert). Simultaneously, it sends an SMS to a predefined number using circuit digest SMS API over Wi Fi.

Components Required

• Arduino UNO R4 Wi Fi
• MQ2 Gas Sensor
• Flame Sensor
• Buzzer
• Red and Green LEDs
• Jumper Wires and Breadboard
• Power Supply
• Internet connectivity (for SMS alerts via API)

SMS Alert Integration

Instead of using GSM modules, this project leverages the built-in Wi Fi of the UNO R4. By integrating with an SMS API (like Fast2SMS), the system sends out alerts immediately when smoke or fire is detected. This makes the setup cost-effective and more modern.

Applications

• Home and office fire safety
• Industrial safety systems
• Smart IoT-based hazard monitoring
• Remote monitoring for senior care or unattended sites

This Arduino-based fire and smoke alarm is a practical, low-cost project with real-world safety benefits. Its ability to send instant SMS alerts makes it suitable for a variety of smart safety applications. Whether you're a hobbyist or an educator, this is a great project to enhance your IoT and sensor integration skills.

For a more detailed Code Explanation and Schematics :  How to build a Smoke and Fire Alarm System using Arduino with SMS Notification

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