SOIL MOISTURE SENSOR

Resistive soil moisture sensor with dual digital (DO) and analog (AO) output. LM393 comparator provides stable digital switching with adjustable threshold potentiometer. LED indicators for power (red) and digital output state (green). Insert probe into soil and read moisture level via Arduino analog pin for precision, or use DO for simple threshold triggering.

Pin Connections:

• VCC — 3.3–5V
• GND — Ground
• DO — Digital output (high = dry / low = wet)
• AO — Analog output (more precise reading)

Specifications:

• IC: LM393 comparator
• Operating Voltage: 3.3–5V
• Output: Digital (DO) + Analog (AO)
• Panel PCB: ~3 × 1.5cm
• Soil Probe: ~6 × 3cm
• Cable Length: ~21cm
• Mounting: Fixed bolt hole

Applications:

• Plant watering automation and alerts
• Arduino soil moisture threshold detection
• Smart garden and irrigation systems
• Relay-triggered watering pumps