International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
www.irjet.net
Intelligent Odor Management System using PLC Rajani Hardas1, Atharv Nimbalkar2, Abhijit Pawar3, Piyush Bhosale4 1Professor, Electrical Engineering, PES Modern College of Engineering, Pune, India
2,3,4Student, Electrical Engineering, PES Modern College of Engineering, Pune, India
---------------------------------------------------------------------***--------------------------------------------------------------------2. ENERGY SAVING PRINCIPLE
Abstract - In modern sanitation systems, maintaining air
quality in enclosed spaces such as restrooms/bathrooms is crucial for hygiene and user comfort. This paper presents an Intelligent Odor Management System Using PLC, which automates exhaust fan operation based on real-time occupancy and odor levels. The system integrates a PIR beam sensor for occupancy detection and an ammonia gas sensor for Odor assessment. A programmable logic controller (PLC) processes sensor inputs and optimally controls the exhaust fan to ensure efficient ventilation while minimizing energy consumption. The proposed system enhances air quality management, reduces manual intervention, and promotes energy efficiency in public and commercial restrooms. Experimental results demonstrate the system's effectiveness in maintaining an odor-free environment. This research contributes to smart automation in sanitation, offering a scalable and cost-effective solution for improved restroom hygiene.
The Intelligent Odor Management System is designed to reduce energy consumption by controlling the exhaust fan operation based on real-time odor detection and usage patterns. Unlike traditional systems where exhaust fans run continuously or are manually operated, this system ensures the fan functions only when required, thus saving energy and reducing wear and tear. The central component of this system is a Programmable Logic Controller (PLC), which processes inputs from two key sources: 1. Ammonia Sensor: This sensor is responsible for detecting the presence of odor in the restroom environment. Whenever any unpleasant smell—particularly ammonia—is detected beyond a predefined threshold, the sensor immediately sends a signal to the PLC. Based on this input, the PLC turns on the exhaust fan to clear the odor and improve air quality.
Key Words: PLC; fan, Odor Detection, Photoelectric Sensor, Ammonia Gas Sensor, Energy Efficiency, Realtime Performance.
2. Infrared (IR) Motion Sensor: This sensor is used solely for counting the number of people entering and exiting the restroom. It provides the PLC with real-time occupancy data, allowing the system to maintain a log of restroom usage throughout the day.
1.INTRODUCTION In modern public and commercial infrastructure, maintaining air quality in restrooms is a critical yet often overlooked aspect of hygiene and energy management. Conventional ventilation systems typically rely on manual control or continuous operation of exhaust fans, which results in significant energy wastage, higher maintenance requirements, and accelerated equipment degradation. These inefficiencies highlight the need for a smarter, more sustainable solution to odor control.
What makes this system more intelligent is its ability to learn from historical usage patterns. The PLC logs data from the last 7 days. Using this stored data, the system can identify peak usage hours and adjust its responsiveness.
3. SYSTEM ARCHETECTURE The intelligent odor management system is designed to automate the operation of restroom ventilation based on real-time detection of air quality and restroom occupancy. The system primarily relies on a Programmable Logic Controller (PLC), which processes signals from sensors and controls the exhaust fan accordingly. The PLC acts as the central decision-making unit, programmed to respond to specific conditions based on sensor input and historical data.
This research presents the design and implementation of an Intelligent Odor Management System using a Programmable Logic Controller (PLC). The proposed system aims to optimize exhaust fan operation by integrating real-time data from ammonia gas sensors, which detect odor levels, and infrared (IR) motion sensors, which monitor occupancy. The PLC serves as the system’s brain, processing sensor inputs and making intelligent control decisions to activate or deactivate exhaust fans only when necessary
The ammonia sensor plays a critical role by detecting odor levels within the restroom. When the concentration of ammonia crosses a predetermined threshold, the sensor sends an analog signal to the PLC, prompting it to trigger the ventilation system. Simultaneously, the infrared motion
By automating the ventilation process based on actual usage and air quality conditions, this system minimizes unnecessary energy consumption while ensuring a consistently hygienic restroom environment.
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