I connected one soil probe to power, and the other to ground through a 10kΩ resistor and to Arduino's analog pin A0. I did the same with the thermistor and photoresistor, but connected those to ...

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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Environmental Monitoring with Arduino: Building Simple Devices to Collect Data About the World Around Us, written by Emily Gertz and Patrick Di Justo and published by O'Reilly's Maker Press ...