Low-Cost IoT Gas Sensor System Could Revolutionize Fruit Freshness Monitoring

A new study has introduced a low-cost Internet of Things (IoT)-based gas sensor system capable of monitoring mango ripening and spoilage in real time. The research highlights how affordable gas sensing technology can help reduce post-harvest losses, improve food quality, and support smarter food supply chains.

Researchers developed the system using an Arduino Uno microcontroller, MQ-3 gas sensor, DHT11 temperature-humidity sensor, and infrared module. The complete setup costs approximately INR 2000 (around USD 24), making it highly accessible for farmers, storage facilities, and food distributors.

Key Findings

The system successfully tracked ethylene gas emissions — a natural plant hormone closely linked to fruit ripening and spoilage — in Kesar and Banganapalli mango varieties.

Researchers observed that:

• Ethylene levels increased steadily during ripening and exceeded 200 ppm during peak ripening stages.
• Kesar mangoes recorded a maximum ethylene concentration of 213 ppm.
• Banganapalli mangoes reached 241 ppm.
• Declining ethylene levels after the peak indicated the onset of fruit senescence and spoilage.

The findings demonstrate that gas sensor technology can provide continuous, non-destructive freshness monitoring in storage environments.

According to the authors, the system can support real-time monitoring in warehouses, cold-chain logistics, supermarkets, and export supply chains.

Why This Research Matters

Food spoilage during storage and transportation remains a major global challenge, especially for highly perishable fruits such as mangoes. Traditional quality assessment methods often rely on visual inspection or destructive testing, which can be inaccurate, time-consuming, and expensive.

Gas sensing technology offers a smarter alternative.

The study builds on growing global research showing that gas sensors can rapidly detect volatile organic compounds (VOCs) released during food spoilage. These compounds act as chemical indicators of freshness, allowing sensors to monitor food quality continuously and automatically.

The review paper titled Applications of Gas Sensing in Food Quality Detection: A Review explains that gas sensors are increasingly being used in aquatic products, meat products, dairy, fruits, grains, and beverages. Technologies such as metal oxide (MOX) sensors, electrochemical sensors, colorimetric sensors, and surface acoustic wave (SAW) sensors are becoming important tools for modern food safety systems.

Researcher Perspective

The authors emphasized that integrating gas sensors with IoT platforms enables real-time monitoring and early spoilage detection without damaging the food product.

“The developed system provides continuous monitoring and displays real-time data, enabling early detection of spoilage,” the researchers stated in the study.

They further noted that such systems could help reduce post-harvest losses while improving food quality assurance across agricultural supply chains.

The broader review also highlighted that future gas sensor systems combined with artificial intelligence, machine learning, and big data analytics may significantly improve freshness prediction and automated food monitoring.

Future Applications and Industry Impact

Researchers believe the future of food quality monitoring will rely heavily on intelligent sensor systems integrated with AI, cloud computing, and IoT networks.

Potential applications include:

• Smart fruit storage warehouses
• Cold-chain transportation monitoring
• Supermarket freshness tracking
• Food export quality assurance
• Automated spoilage alert systems
• Wearable and flexible food-monitoring sensors

The review further suggests that future sensor technologies may combine gas detection with image recognition and microbial analysis to create highly accurate multi-sensory food monitoring platforms.

Conclusion

The newly developed IoT-enabled mango freshness detector demonstrates how affordable gas sensing technology can deliver real-time, non-invasive food quality monitoring. By detecting ethylene emissions during ripening and spoilage, the system provides an effective early-warning tool for reducing food waste and improving storage management.

As gas sensor technologies continue to advance, researchers expect them to become central components of next-generation smart food systems, helping industries improve food safety, reduce economic losses, and ensure fresher products for consumers worldwide.

Research Reference

Babu, C. M., Rajender, G., Kumar, K. C., Swathi, C., Anvesh, B., Ajay, B., & Divyanjali, G. (2026). A Low-Cost IoT-Based Gas Sensor Approach for Real-time Monitoring of Mango Fruit Ripening and Spoilage in Storage Conditions. European Journal of Nutrition & Food Safety, 18(5), 72–84. https://journalejnfs.com/index.php/EJNFS/article/view/2037

Ma, M., Yang, X., Ying, X., Shi, C., Jia, Z., & Jia, B. (2023). Applications of Gas Sensing in Food Quality Detection: A Review. Foods, 12(21), 3966. https://www.mdpi.com/2304-8158/12/21/3966