HALJIA 5PCS Soil Hygrometer Humidity Moisture Detection Water Sensor Module with Dupont Cable 3.3V - 5V Automatic Watering System Compatible with Arduino Robot Smart Car

The sensor is suitable for soil moisture detection. Can be used in module plant waterer device, and the plants in your garden no need people to manage. Operating voltage: 3.3V-5V; Dual output mode,analog output more accurate. Interface Description (4-wire) VCC: Power Positive 3.3V-5V; GND: Power Negative; DO: Digital output interface (0 and 1); AO: Analog output interface The blue potentiometer in the module is used to adjust the threshold of soil humidity. It is adjusted clockwise, and the controlled humidity will be larger, and counterclockwise will be smaller. Adjusting the soil moisture control threshold through the potentiometer can automatically control vegetable gardens, automatic watering of gardens, soil moisture control of home flower pots, various electronic games, electronic building blocks, arduino designs, etc.