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Soil Moisture Sensor Module

Soil Moisture Sensor Module

₹33.00Price

🌱 Soil Moisture Sensor Module

Soil Water Detection • Smart Irrigation • Plant Monitoring

The Soil Moisture Sensor Module is an electronic sensor used to measure the moisture level in soil. It is commonly used in smart irrigation systems, agricultural monitoring, and plant care automation. The sensor works by measuring the electrical conductivity between two probes inserted into the soil.

The image you shared shows a typical soil moisture sensor kit, which includes:

  • 🌱 Soil probe sensor plate

  • 🔌 Connecting wires

  • Control module with comparator

📊 Infographic Overview

🔹 Basic Specifications

FeatureDetails
🔌 Operating Voltage3.3V – 5V
⚡ Operating Current~10–20 mA
📡 Output TypeAnalog (A0) & Digital (D0)
🌱 Detection MethodSoil electrical conductivity
🔧 Sensitivity AdjustmentYes (Potentiometer)
🧩 Interface4-Pin module

🧩 Main Components

1️⃣ Soil Moisture Probe

  • Two metal conductive probes

  • Inserted directly into soil

  • Detects water content through electrical resistance

2️⃣ Control Module

The small board contains:

  • LM393 Comparator IC

  • Sensitivity adjustment potentiometer

  • Power LED

  • Digital output LED

  • Signal pins

🔌 Pin Configuration

PinFunction
VCCPower supply (3.3V – 5V)
GNDGround
A0Analog output (moisture level)
D0Digital output (threshold signal)

⚙️ Working Principle

The sensor measures soil resistance to electrical current.

Step-by-Step Operation

1️⃣ The two metal probes are inserted into the soil.
2️⃣ Soil moisture allows electric current to flow between probes.
3️⃣ Wet soil → lower resistance → higher conductivity.
4️⃣ Dry soil → higher resistance → lower conductivity.
5️⃣ The control module converts this into analog and digital signals.

📐 Sensor Layout (Based on Your Image)

Soil Moisture Sensor Kit

┌─────────────────────┐
│ Soil Probe Plate │
│ (Moisture Sensor) │
└─────────────────────┘

│ Wire

┌─────────────────────┐
│ Control Module │
│ Potentiometer │
│ Comparator IC │
│ LED Indicators │
└─────────────────────┘

┌─────┬─────┬─────┬─────┐
│ VCC │ GND │ A0 │ D0 │
└─────┴─────┴─────┴─────┘

🤖 Common Applications

🌾 Smart irrigation systems
🌱 Automatic plant watering systems
🚜 Agricultural soil monitoring
🏡 Smart garden systems
📡 IoT farming projects
🌍 Environmental monitoring

🔌 Compatible Microcontrollers

The soil moisture sensor can easily connect with:

  • Arduino Uno

  • ESP32

  • Arduino Nano

  • Raspberry Pi

💡 Advantages

✅ Simple and low-cost sensor
✅ Easy to interface with microcontrollers
✅ Provides both analog and digital output
✅ Adjustable sensitivity
✅ Ideal for smart farming and DIY projects

⚠️ Limitations

❌ Metal probes may corrode over time
❌ Accuracy affected by soil type
❌ Needs occasional cleaning and calibration

🔧 Example Project Idea

🌱 Automatic Plant Watering System

Components

  • Soil Moisture Sensor

  • ESP32

  • Water pump

  • Relay module

  • Power supply

Working

✔ Sensor detects dry soil
✔ Microcontroller activates pump
✔ Water irrigates plants automatically
✔ Pump stops when soil moisture reaches desired level

Quantity
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