Basic two-piece water sensor which measures the soil moisture. The sensor connects to the sensor module which manages the digital and analog output.

It operates on 3.3V - 5V and has a digital output as well as an analog output

For the digital output, the potentiometer can be used to trigger the change between HIGH and LOW.

Features:

• Sensor and module separate
• LM393 comparator
• Dual output (Digital or analogue)
• Power indicator
• Digital mode indicator
• Variable voltage between 3.3V and 5V
• Module connector spacing to suit breadboard
• VCC can be powered from digital out - to switch sensor on and off through code

Specifications:

• Comparator Chip: LM393
• Operating Voltage: 3.3V~5V
• Module:
• Size: 32mm x 14mm
• Mounting hole: One
• Connectors to Sensor: right angle: +, -
• Connectors to Unit: right angle: VCC (3.3V - 5V), GND, DO, AO
• Sensor:
• Size: 60mm x 20mm
• Probes: 2 x 7mm x 45mm
• Mounting hole: Two
• Connectors to Module: right angle: +/-
• Cable connecting module and sensor: One
• 20cm
• DuPont female/female
• two wires

For working examples for nodeMCU using Lua see our blog entry here