A simple, palm-sized water detection sensor that outputs a digital high signal when water or condensation is detected on its surface. The compact red PCB features interlocking traces connected to a lightly biased transistor — when water bridges two traces, the transistor switches on and the output pin goes high.

Wiring is straightforward: connect the minus (−) pin to ground, the plus (+) pin to 3–5 V DC, and read the signal (S) pin with your microcontroller. While the output voltage varies slightly with the amount of water present, the sensor works best as a simple on/off water detector.

Key Features

• Digital Output – Signal pin goes high when water is detected
• 3–5 V Compatible – Works with Arduino, Raspberry Pi, and other microcontrollers
• Simple 3-Pin Interface – Ground, power, and signal
• Compact PCB – Palm-sized with interlocking detection traces

Specifications

• Operating Voltage: 3–5 V DC
• Output: Digital (active high)
• Pins: − (GND), + (VCC), S (Signal)

Ideal For

• Leak detection and flood alerts
• Plant watering and soil moisture projects
• Condensation monitoring
• Rain detection