An IoT-Based Datalogger of Environmental Values

The paper characterizes the architecture of an IoT system for measuring and visualizing environmental data. The first part describes the construction of a solar panel powered, IoT-based datalogger of environmental values such as temperature, humidity, and pressure. The second part then outlines a solution to the related cloud system. The datalogger is built as a setup driven by a microcontroller. The program for the microcontroller was written in the C language. Functionally, the microcontroller communicates with the sensors through an I2C bus; the configuration and control of the measurement are performed via a PC application compiled in C# and connected to the device over a USB bus. The measured data are stored in a Micro SD card and transmitted by means of the LoRa technology to the local LoRa cloud provider. The data are then resent from this local provider to a cloud-based Amazon MySQL database and can be visualized through a web application coded in the ASP.NET Core framework. This paper presents the entire, ready-to-use system.