Elecrow Crowtail Water Sensor - Crowtail Interface Module

The sensor module itself is designed to work with the standard Crowtail interface voltage, which is typically 3.3V or 5V, provided by the connected base board (like a Crowduino). You should power it through the Crowtail connector, not directly apply voltage to the sensor traces.

Using a Crowtail base shield mounted on your Arduino (or compatible board), plug the sensor into any digital I/O port. In your code, set the corresponding pin as an INPUT with a pull-up enabled (or rely on the internal 1 MΩ resistor). Read the pin's state; it will be HIGH when dry and LOW when water bridges the exposed traces.

This is a presence detector, not a level sensor. It provides a simple digital on/off signal. It can indicate if water is contacting the traces, but it cannot differentiate between a single drop and full submersion or provide analog level data.

Its operating temperature range is limited to 10-30°C, and the exposed PCB traces are not sealed or protected against corrosion. It is best suited for indoor, protected environments. For outdoor or wet locations, consider a sealed, capacitive, or float-based sensor with appropriate IP ratings.