In large facilities or buildings, it can be challenging to monitor and manage multiple refrigerators at once. Internal environmental conditions, temperature, humidity, and open/closed state are challenging to track across a fleet of refrigerators, and often require human intervention to spot a door left open, or deduce that the internal temperature may be too high or low based on the condition of food in the fridge. Not only do these factors materially affect the electricity costs across a facility, but failure to intervene when a door is left open or the temperature is too low can result in spoilage and potential health risks.

This project provides a simple, low-configuration, LoRa solution with cellular or Wi-Fi cloud backhaul, as well as an open-source dashboard application that can be deployed to a number of cloud hosts for viewing temperature, humidity, and the open/closed state of refrigerators in a fleet. By combining the hardware available in a Sparrow Developer Kit with Adafruit contact switch sensors and uploading modified Sparrow Reference Firmware, these LoRa-based devices are capable of measuring all of the above, and the deployable Sparrow Reference devices can be mounted with command strips inside of each refrigeration unit for easy installation and removal.