Soil Moisture Sensor Module
The Soil Moisture Sensor Module is a must-have for automated gardening and agricultural projects, available at RoboShop BD. This sensor measures the volumetric content of water in the soil by monitoring the electrical resistance between its two conductive probes. It provides both an Analog output for precise moisture tracking and a Digital output for simple threshold-based triggers, making it the perfect “brain” for an automatic plant watering system.
70.00৳ 90.00৳
How It Works: Resistance-Based Sensing
The module consists of a fork-shaped probe and an electronic control board. When the soil is dry, the resistance between the probes is high, resulting in a low conductivity. As moisture increases, the soil conducts electricity better, lowering the resistance. The onboard LM393 comparator chip processes this change, allowing you to set a custom “thirst” level for your plants. At RoboShop BD, we recommend this sensor for its simplicity and immediate integration with Arduino, ESP32, and Raspberry Pi.
Adjustable Sensitivity & Dual Output
The control module features a blue potentiometer (trimmer) that allows you to set a moisture threshold. When the soil reaches the set dryness level, the Digital (DO) pin will trigger, which can directly drive a relay or alert a microcontroller. For more advanced users, the Analog (AO) pin provides a variable voltage (0V to 5V) that can be mapped to a percentage (0% to 100% moisture), giving you total control over your irrigation schedule.
Key Features
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Dual Output Mode: Analog output for high precision and Digital output for easy threshold switching.
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Adjustable Threshold: Onboard potentiometer to calibrate the sensor for different soil types (sandy vs. clay).
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Corrosion Protection: Probes are often nickel-plated or gold-immersed to resist oxidation in damp soil.
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Status Indicators: Includes a power LED (red) and a digital switch output indicator (green).
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Wide Voltage Range: Operates reliably on 3.3V to 5V power supplies.
Easy Installation: Features a fixed bolt hole for secure mounting on your project frame
Technical Specifications
| Specification | Details |
| Operating Voltage | 3.3V – 5.0V DC |
| Operating Current | 15mA |
| Output Type | Analog (AO) & Digital (DO) |
| Comparator Chip | LM393 |
| Detection Depth | ~50 mm (Probe Length) |
| PCB Dimensions | 32mm x 14mm |
| Probe Dimensions | 60mm x 20mm |
| Weight | ~10g |
Pinout Configuration
| Pin | Name | Function |
| 1 | VCC | Power Supply (3.3V – 5V) |
| 2 | GND | System Ground |
| 3 | DO | Digital Output (High/Low based on threshold) |
| 4 | AO | Analog Output (Variable voltage based on moisture) |
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