The Soil Moisture Detector Module with a Corrosion Resistance Probe (DC 3.3-12V) is an electronic kit designed to measure water levels in soil. It features a specially coated, heavy-duty metal probe to drastically slow down the oxidation and rust common in basic resistive sensors. Technical Specifications

Operating Voltage: DC 3.3V to 12V (Compatible with 3.3V and 5V microcontrollers like Arduino, ESP32, and Raspberry Pi)
Working Current: Less than 20mA (Output current capacity: < 30mA)
Comparator Chip: Onboard LM393 voltage comparator for reliable digital switching
Outputs: Dual interface layout
- AO (Analog Output): Outputs a real-time voltage curve based on soil resistance
- DO (Digital Output): Outputs a simple High/Low signal based on an adjustable threshold

Pin Configuration & Module WiringThe processing board contains a 4-pin interface block:

+ (VCC): Connects to your positive power supply (3.3V – 12V). Avoid reversing polarity to prevent chip burnout.
– (GND): Connects to the system ground line.
DO: Digital Output. It outputs a Low level (0V) when soil moisture exceeds your set limit.
AO: Analog Output. Delivers raw voltage readings directly to an Analog-to-Digital converter pin.