It's a simple and effective concept for water detection. Use a grid of electrodes, with one half attached to a very weak 1M pull-up resistor. When a water drop bridges the electrodes, the resistance falls dramatically - so much so that this Grove module can be plugged into either an analog or digital port.

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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.