The brick is mainly comprised of three parts: An Electronic brick connector, a 1 Mohm resistor, and several lines of bare conducting wires.

This sensor works by having a series of exposed traces connected to ground and interlaced between the grounded traces are the sens traces. The sensor traces have a weak pull-up resistor of 1 Mohm. The resistor will pull the sensor trace value high until a drop of water shorts the sensor trace to the grounded trace. Believe it or not this circuit will work with the digital I/O pins of your Arduino or you can use it with the analog pins to detect the amount of water induced contact between the grounded and sensor traces.

Features:

• Working voltage: 5V

• Working Current: <20ma

• Interface: Analog

• Width of detection: 40mm x 16mm

• Working Temperature: 10C-30C

• Weight: 3g

• Size: 65mm x 20mm x 8mm

• Arduino compatible interface

• Low power consumption

• High sensitivity

• Output voltage signal: 0~4.2V

Pin Definition:

• "S" stand for signal input

• "+" stand for power supply

• "-" stand for GND

Applications:

• Rainfall detecting

• Liquid leakage

• Tank overflow detector