Monitoring of Temperature in Retail Refrigerated Cabinets Applying IoT Over OpenSource Hardware and Software The control of refrigeration in the food chain is fundamental at all stages, with special emphasis on the retail stage. The implementation of information and communication technologies (IoT, opensource hardware and software, cloud computing, etc.) is representing a revolution in the operational paradigm of food control. This paper presents a lowcost IoT solution, based on free hardware and software, for monitoring the temperature in refrigerated retail cabinets. Specifically, the use of the ESP8266WiFi microcontroller with DS18B20 temperature sensors is proposed. The ThingSpeak IoT platform is used to store and process data in the cloud. The solution presented is robust, affordable, and flexible, allowing to extend the scope of supervising other relevant parameters in the operating process (light control, energy efficiency, consumer presence, etc.).

A smart domestic refrigerator with energy efficiency improvement This paper proposes hardware revision of a conventional domestic refrigerator: a WiFi enabled main control board design with backward compatibility with existing peripherals are explained. A simple learning algorithm is also implemented on the microcontroller to maximize system efficiency while maintaining temperature at food safety limit or useru0027s temperature preference. A wireless sensor node (WSN) is also introduced to reflect the actual food temperature for more precise temperature monitoring and control. The result from shows that the refrigerator can achieve higher efficiency at 6.38% for refrigeration cycle and 7.18% for defrost cycle. The result can be improved further with additional data collected and better algorithm implemented.