He managed to build his own monitor using an Arduino. The trick of this build has to do with how the system works. The panel includes an LED light that blinks 1000 times for each kWh of electricity.

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The soil-moisture monitoring network used in this study is compromised of 6 profilers (each covering a depth of 2 m) with 4-5 sensors per profile, located at different depths. The network is connected ...