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One of the tasks of the Internet of Things is the monitoring of environmental factors. IoT is a
very convenient tool for integrating diverse monitoring systems. By using cloud services and
IoT it is possible to combine monitoring with control. With the current large water deficit and
climate change, the implementation of soil profile moisture monitoring seems to be crucial.
The next step could be automatic irrigation control. Based on the moisture information from
IoT but also on weather forecasts, significant water and energy savings in crop irrigation can
be achieved.
The aim of this work was to integrate an eight-channel TDR device for soil moisture
measurement and PTDT (Profile Time Domain Transmission) probes in one IoT-based
monitoring system. The paper presents the IT technologies used for this purpose. It also
includes a description of wireless communication hardware solutions and presents the latest
measurement results obtained over a period of one year. Thanks to the use of two-way
communication, it was possible to remotely change the measurement interval, which helps
in times of solar energy deficit to maintain an efficiently operating system. The developed
system has been equipped with a notification mechanism in critical situations, such as: lack
of data for more than a few hours, excessively discharged battery, etc. Current tests indicate
that the system may be useful for further development targeted at automation in precision
agriculture.
