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A simple but effective Grove water sensor. Expose the electrodes to a drop of water, and the signal drops very low. Can be used with both analog and digital ports.
$5.79 CAD
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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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