# Microcontroller Based AVR Hazardous Gas Detection System using IoT

**Authors:** Ram Prasad  
**arXiv:** [2305.12855](https://arxiv.org/abs/2305.12855)  
**Date:** 2023-05-22  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/2305.12855v1/

## Key points

- The MQ-6 Semiconductor Sensor is highly sensitive and uses SnO2 as its sensitive material
- It exhibits lower conductivity in clean air and higher conductivity when combustible gases are present
- The change in resistance corresponds to the output signal of gas concentration
- It is highly sensitive towards Methane, Propane, and Butane
- Suitable for detecting various gases
- Low cost and versatile for different applications
- Proposed model for a user interactive gas leakage and fire alarm system using an embedded system design with an AVR microcontroller
- GSM module enables internet connectivity for IoT applications and sends gas leakage messages to emergency numbers
- Uploads data from the Gas Sensor to a virtual server that can be displayed on a webpage
- Alerting system consisting of a buzzer and LCD display for alerts and notifications
- MQ-6 gas sensor plays a crucial role in detecting gas leakage within the proposed model

## Summary

The MQ-6 Semiconductor Sensor for Combustible Gas detection is a highly sensitive gas sensor that utilizes SnO2 as its sensitive material. In clean air, the sensor exhibits lower conductivity. When combustible gases are present, the conductivity of the sensor increases along with the rising gas concentration, resulting in a higher current and lower resistance. This change in resistance corresponds to the output signal of gas concentration. The MQ-6 gas sensor demonstrates high sensitivity towards Methane, Propane, and Butane, making it suitable for detecting these gases and others. Its low cost and versatility make it well-suited for various applications. In an article published in the International Journal on AdHoc Networking Systems (IJANS), a proposed model for a user interactive gas leakage and fire alarm system is presented. The model incorporates an embedded system design utilizing an AVR microcontroller to control all modules and peripheral devices connected to it. A GSM module enables internet connectivity for IoT applications and sends gas leakage messages to emergency numbers specified in the program. It also uploads data from the Gas Sensor to a virtual server that can be displayed on a webpage. To provide alerts and notifications, an alerting system consisting of a buzzer and LCD display is implemented. The buzzer functions as an alarm while the LCD display shows alert messages and other relevant details. The MQ-6 gas sensor plays a crucial role in detecting gas leakage within this proposed model due to its accurate sensing capabilities as a semiconductor-based component. <ks> Conclusion: </ks> This refined summary highlights both the capabilities of the MQ-6 Semiconductor Sensor for Combustible Gas detection and its application within a user interactive gas leakage and fire alarm system, showcasing its high sensitivity, low cost, and versatility for various applications.