Performance investigation on a capacitive soil moisture sensor for smart home irrigation system

Gopalakrishnan, Mittiraan (2023) Performance investigation on a capacitive soil moisture sensor for smart home irrigation system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This paper provides a comparative analysis of soil moisture measurement using capacitive soil moisture sensors of various dimensions. Some methods use soil moisture sensing probes of various dimensions to study their response to different levels of moisture content. A gravimetric and volumetric technique is used to calibrate a capacitive soil moisture sensor in this study. A NodeMCU 8266 system is used to compare sensor characteristics such as response, sensitivity, and stability over different ranges of soil moisture content in order to select the best probe for soil moisture measurement applications involving a range of soil moisture level values that can be calibrated to the volumetric soil moisture content using gravimetric methods using dry and wet soil volume and weight. The project also have to build a smart irrigation system using the IoT concept which is also cost-effective. This smart irrigation system has an analogue multiplexer that adds on an analogue output pin for soil moisture sensors so that allowing the water pumps to function appropriately watering the plant in different places respectively. To promote the use of green energy, the system's power supply will be designed to utilise solar power. Finally, using an automatic irrigation system makes it easier for homeowners and farmers to irrigate their land more conveniently.

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