Project Hub /Audio Displays & Interactive Media/LED Matrix & Cube Displays/Gas Leakage Detector Using Arduino: Complete DIY Guide

Beginner

ARDUINO

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Gas Leakage Detector Using Arduino: Complete DIY Guide

Learn how to build a budget-friendly gas leakage detector using an Arduino Uno and an MQ-5 gas sensor to alert users of dangerous gas levels.

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.

Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
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: 9V Battery + Snap

Browse all components

How It Works

This gas leakage detector project operates by continuously monitoring the surrounding air for the presence of target combustible gases using an MQ-5 gas sensor connected to an Arduino Uno. The MQ-5 sensor features a sensitive material whose electrical resistance changes when it comes into contact with gases like LPG, natural gas, or town gas. As gas concentration increases, the output voltage from the sensor changes, which is read by one of the analog input pins on the Arduino Uno. The microcontroller processes this incoming analog signal and compares it against a predefined threshold value programmed via the Arduino IDE. If the sensed gas level remains below the threshold, the system stays in a normal state. However, if the gas concentration surpasses the safety threshold, the Arduino triggers an output signal to notify the user. This signal drives a connected LED to provide a visual warning and activates a buzzer to produce an audible alarm, alerting individuals to potential danger. A 220-ohm resistor is used to limit current through the LED, while an optional 10k-ohm resistor can help manage the buzzer circuit. The entire circuit is conveniently wired on a breadboard and powered via a 9V battery or a USB connection, making it an interactive and responsive monitoring system.

Why Build This

Gain practical maker experience by building a functional safety device suitable for deployment near home gas stoves or kitchen LPG cylinders.

Learn how to integrate analog environmental sensors with a microcontroller to process real-world physical data into actionable alerts.

Construct an affordable, portable early-warning system that can be deployed in small workshops, food trucks, or DIY lab spaces.

Real-World Application

Can be used in homes and kitchens near gas stoves and LPG cylinders, in small commercial kitchens, restaurants, food trucks, and in warehouses storing gas cylinders to provide early warnings against potential gas leaks.

Skills You'll Learn

analog sensor reading

threshold logic programming

digital output control

breadboard prototyping

basic circuit current limiting

Safety Precautions

This DIY gas leakage detector is designed for educational and basic monitoring purposes. For critical safety applications, always use certified commercial gas detectors as primary safety devices.

Technology Tags

ARDUINO

MQ-5 SENSOR

GAS SENSOR

BUZZER

LED

C++

EMBEDDED SYSTEMS

SAFETY MONITORING

Frequently Asked Questions

Do I need any prior programming experience to use the Arduino IDE for this project?

Basic familiarity with the Arduino IDE is helpful for uploading code, but beginner-friendly sketches for reading analog sensors and controlling digital outputs are widely available and easy to follow.

Can I power this circuit using a standard 9V battery instead of a USB connection?

Yes, the circuit can be powered using either a 9V battery or a USB connection, making it flexible for both stationary and portable testing.

Why is a 220-ohm resistor included in the parts list?

The 220-ohm resistor is placed in series with the LED to limit the current flowing through it, protecting the component from burning out when driven by the Arduino.

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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