SparkFun
SparkFun Soil Moisture Sensor (with Screw Terminals)
A simple breakout board for measuring moisture in soil and similar materials. The two large exposed pads act as probes — functioning as a variable resistor w...
A simple breakout board for measuring moisture in soil and similar materials. The two large exposed pads act as probes — functioning as a variable resistor where higher moisture means better conductivity, lower resistance, and a higher signal output. This version includes a 3-pin screw terminal pre-soldered for easy wiring.
Connect VCC and GND to any Arduino-compatible board and read the analogue SIG output to determine moisture level. The PCB features a gold ENIG finish for improved corrosion resistance in moist environments.
Key Features
- Analogue Output – Signal level proportional to soil moisture content
- Screw Terminals – 3-pin terminal block pre-soldered for tool-free wiring
- ENIG Gold Finish – Electroless Nickel Immersion Gold for corrosion resistance
- Simple Interface – Just VCC, GND, and SIG — works with any analogue input
Ideal For
- Automated plant watering systems
- Garden and greenhouse monitoring
- Soil science experiments
- Environmental data logging
Resources
- Hookup Guide – Assembly, weatherproofing, and example project
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- Terminal block
- A connector used to join wires together in a neat, removable, or serviceable way. For this product, it helps split one power input into several outputs without soldering.
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Brands
Sensors & Input
STEM & Education
SparkFun Soil Moisture Sensor Schematic
Schematic · 94.1 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 1.1 MB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
Related Tutorials
Free guides on learn.littlebird.com.au
