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When the sensor detects that the moisture content is already below 30%, it sends a signal to the Arduino, which, in turn, activates a water pump to provide hydration to the plant.
"Surprising twist in confined liquid crystals: A simple route to developing new sensors." ScienceDaily. ScienceDaily, 24 March 2017. <www.sciencedaily.com / releases / 2017 / 03 / 170324192627.htm>.