This project focuses on creating smart devices that monitor environmental parameters such as temperature, humidity, and light intensity in indoor and outdoor locations simultaneously. The devices collect data, display real-time readings, store data locally, and transmit it to a database using HTTP POST or MQTT protocols.
- Smart Devices - Two smart devices are created, each equipped with sensors to monitor temperature, humidity, and light intensity. The devices run the same code but are placed in different locations - one indoors and one outdoors.
- Data Collection and Transmission - Data is collected every 6 seconds for temperature, every 3 seconds for humidity, and every 6 seconds for light intensity. Readings are displayed on a local LCD screen and saved to flash memory once every minute. Sensor data is transmitted to a database using either HTTP POST or MQTT protocols, based on user selection. A separate script fetches published readings from MQTT and stores them in the database.
- Database Design - The database stores sensor data along with a timestamp and the name/location of the smart node. The design allows for adding additional smart nodes without modifying the database structure.
- Web Interface - A web server provides pages for browsing historical data, adding new smart nodes, and viewing data submitted by specific smart objects. The smart object presents a web portal for user interaction and configuration.
- Over-the-Air (OTA) Update - OTA updates allow for updating the smart object's code, tested by changing the heartbeat rate.
To run the project, follow these steps:
- Assemble the circuit with an ESP32 and connect the pins as specified in the .ino file in the Arduino code.
- Run the smart objects in indoor and outdoor locations.
- Start the backend code and MQTT script.
- Access the web interface to interact with the smart objects and configure settings.