Web-Based Monitoring of Refrigerator Units Using Microcontroller

Over the past few decades, manufacturers of freezer units such as fridges and refrigerators have been focusing on improving the performance of their products. These devices are typically large and consume a significant amount of electricity, leaving behind a considerable carbon footprint and requiring high maintenance and operating costs. In recent months, the demand for low-cost freezer units has surged, both from households and businesses, due to the global energy crisis. In this paper, we develop and implement a smart sensor system that controls the cooling mechanism of multiple freezer units in a retail store, such as a supermarket or meat industry, based on the Internet of Things (IoT) technology. The system allows the store manager or an employee to monitor the temperature and humidity inside the unit and manually control its operation. Additionally, the freezer automatically activates or deactivates based on the threshold value determined by the temperature requirements of each unit. The sensor data is transmitted wirelessly to the main controller, an ESP32 micro-controller, which runs a web server that displays the measurements.