This simple water sensor can be used to detect soil moisture.
When the soil moisture reach a low level the module outputs go to high level.
Use this sensor for an automatic plant waterer device.
 

Features

• Adjustable sensitivity
• Operating voltage 3.3V-5V
• Module dual output mode, digital output, analog output
• A fixed bolt hole for easy installation
• Small plates PCB size: 3cm * 1.6cm
• Power indicator (red) and digital switching output indicator (green)
• Using LM393 comparator chip

Interface Description (4-wire)

1. VCC external 3.3V-5V
2. GND external GND
3. DO-board digital output interface (0 and 1)
4. AO-board analog output interface