![enter image description here][1] **DESCRIPTION** Grove - Water Sensor detects the presence of water using exposed PCB traces. The sensor is made up of interlaced traces of Ground and Sensor signals. The sensor traces are weakly pulled up using 1 MΩ resistor. The resistor will pull the sensor trace value high until a drop of water shorts the sensor trace to the ground trace. This circuit will work with digital I/O pins of Arduino or you can use it with the analog pins to detect the amount of water induced contact between the grounded and sensor traces. **APPLICATIONS** - Rainfall detection - Liquid leakage - Tank overflow detection **KEY FEATURES** - Grove compatible interface - Low power consumption - High sensitivity **DOCUMENTS** Please visit our [wiki][2] page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum. For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=748 [1]: /editor/20160711/5783bbfcedff2.png [2]: http://garden.seeedstudio.com/index.php?title=Twig_-_Water_Sensor