Cold Chain Monitoring System

The preservation of temperature-sensitive products such as vaccines, pharmaceuticals, dairy items, and frozen foods requires an efficient and reliable cold chain monitoring system. Any deviation from the recommended temperature and humidity range during transportation or storage can result in product degradation, financial loss, and potential health risks. This paper presents the design and development of a low power consumption IoT-based Cold Chain Monitoring System using the ESP32 WROOM microcontroller. This system allows user to set a threshold temperature which should not exceed during the travel. If temperature exceeds in the threshold temperature, system will activate the temperature collection and upload to cloud. This logic is put in place to lower the Power consumption as entire system will not be powered at all time. It will be powered up based on the requirement. The system integrates a DHT11 temperature and humidity sensor for environmental monitoring, a GPS module for real-time location tracking, and a GSM module for instant alert notifications. The ESP32 processes the collected data and uploads it to a cloud platform via Wi-Fi for remote monitoring. The proposed system ensures monitoring, data logging, and improved transparency in cold chain logistics. Experimental results demonstrate reliable performance, low power consumption, and effective alert generation, making the system suitable for pharmaceutical and food supply chain applications.