Together with the Industry 4.0 revolution, the IoT networks have been continuously growing, accompanied by the invention and improvement of communication protocols and sensor terminals. New sensor nodes in the IoT systems need adapting to the protocol and optimizing the built-in data collection and measurement capabilities. In this paper, we present a new development direction for the IoT network sensor node, namely the use of a capacitive sensor principle to research and develop the sensor node to measure soil moisture. Simulation has been carried to evaluate the advantages and disadvantages of the method and proposing the applicability of sensor nodes in the IoT systems.
