Datasheet

2
1. Introduction
The Water Sensor module is part of the Grove system. It indicates whether the sensor is dry, damp
or completely immersed in water by measuring conductivity. The sensor traces have a weak pull-
up resistor of 1 MΩ. The resistor will pull the sensor trace value high until a drop of water shorts
the sensor trace to the grounded trace. Believe it or not this circuit will work with the digital I/O pins
of your Arduino or you can use it with the analog pins to detect the amount of water induced contact
between the grounded and sensor traces.