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.

It features over 5,400 projects, ranging from simple tutorials — like using a soil moisture sensor with Arduino — to more complete guides like building a Bluetooth-controlled car.

5 projects best suited to an Arduino, not a Raspberry Pi. Story by Patrick Hearn ... All it requires is a moisture sensor, a water pump, and some sort of container to hold a reserve.