Smart Room Monitoring & Environmental Control System Using ESP32

Our Smart Room Monitoring/Environmental Control System was designed and developed to automate and optimize environmental conditions across multiple controlled rooms.

This system was designed to monitor temperature, humidity, and rack cycles while providing centralized visibility/control through a modern IoT architecture.

The design of this solution provides reliability, scalability and real-time control making it well suited for environments like agriculture processing units, storage facilities and/or controlled manufacturing environments.

We had to create an integrated system for our client that could:

• Keep all rooms consistently controlled with tight environmental regulation
• Keep track of rack usage and processing cycles
• Provide users with an easy-to-use touch interface in each room
• Allow users to remotely monitor/manage/control the environmental and processing system using one central dashboard
• Provide alerts and historical data to enable better decision making.

The challenge at hand was combining all of the different technologies involved (hardware control, real-time data processing, local/cross-platform/cloud-based monitoring, etc) into one cohesive integrated system.

We developed an IoT architecture with multiple layers that included the following components:

Edge Layer (Room Level Controls)

Every room contained a local controller that was a microcontroller based on the ESP32 because they:

• Have Wi-Fi built in
• Use low amounts of energy
• Able to perform processing in real-time

Room composite - Each room contained

• 3-5 temperature sensors
• 2-5 humidity sensors
• 1-2 fans
• 1-2 humidifiers
• 1 motor to rotate and tilt rack

The ESP32 would gather sensor information, execute the control logic, and communicate to the cloud for processing.

Touch Panel Interface

We implemented a wall-mounted touch panel system using a Raspberry Pi-based interface with a custom UI.

Key features

• Set temperature targets for up to 20 processes/items
• View real-time temperature and humidity
• Control fan, humidifier, and motor operations
• Start/stop rack rotation or tilt

The UI was designed with simplicity in mind so operators could easily interact without technical training.

Rack Management System

A facility's specific tracking module was created for rack tracking to allow for the management of multiple racks per room. Features:

• Track active racks in each room
• Maintain cycle duration (days) for each rack
• Provide rack history and rack processing lifecycle

Examples

• Rack1 = Day 4
• Rack2 = Day 10
• Rack3 = Day 1

This feature allowed the client to follow the stages of production, which assisted in the improvement of their workflow.

Communication Layer

We created an integrated method of communication:

• MQTT protocol for streaming data in real-time
• REST APIs to manage configurations and controls

Why did we choose MQTT?

• The protocol is lightweight and efficient
• The protocol is specifically built for IoT devices
• Allow for real-time publishing and submitting of information

Each room was set up therefore to publish their sensor data and device state to the cloud over some predetermined timeframe.

Infrastructure of Cloud

We built a cloud-based backend with the following technologies:

• Node.js/ASP.NET Core APIs
• Databases hosted in the cloud (MongoDB for sensor information, SQL for managed information)

Data handling strategy

• Fast-paced storage in MongoDB (sensor information in JSON)
• Rack, room, and configuration information stored in a relational database

This method of combining both methods provides high-quality performance and allows for structured questioning with performance improvements.

Central Web Dashboard

A responsive web dashboard was built for centralized monitoring.

Features

• Live sensor readings (temperature & humidity)
• Multi-room overview
• Rack cycle tracking
• Historical graphs (temperature & humidity trends)
• Alerts and notifications

We used Chart.js for visualizing historical trends and real-time updates via WebSockets.

Real-Time Monitoring

• Continuous data collection from sensors
• Instant updates on dashboard
• Live visibility of all rooms

Intelligent Alerts

• Configurable thresholds for temperature and humidity
• Alerts triggered when values go out of range
• Notifications via dashboard and optional integrations

Device Control

• Remote control of fans, humidifiers, and motors
• Manual and automated operation modes

Multi-Room Scalability

• Each room operates independently
• Central system aggregates all data
• Easily scalable to add more rooms

Improvements have been measurable by the following measures with this system:

• 30%-40% less time spent on manual monitoring
• Environmental consistency improved
• More accurate production cycle tracking
• Faster decisions made by using real-time information
• Scalable architecture designed for future growth

We proposed additional improvements:

• AI-based predictive control for temperature and humidity
• Integration with external alert systems (SMS/Email/WhatsApp)
• Advanced analytics for process optimization

Our smart room monitoring system demonstrates how the Internet of Things (IoT) has enabled us to create a comprehensive solution that integrates hardware, real-time communication, and cloud intelligence.

By automating the manual process of controlling your environment, the smart room monitoring system allows you to monitor your environment in real-time, thereby increasing productivity and effectiveness through the use of data.

This architecture provides a strong foundation for future smart automation applications due to its robustness, scalability, and modify-ability across multiple industries.

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