SparkFun Soil Moisture Sensor
Overview
The SparkFun Soil Moisture Sensor is a simple breakout board designed to measure the volumetric water content in soil through resistive sensing. The board features two large, exposed pads that act as probes for the sensor, functioning as a variable resistor where the resistance decreases as the soil moisture increases. It is an ideal entry-level solution for automated gardening and environmental monitoring projects.
Why Choose This Part
The sensor is extremely easy to interface with any microcontroller possessing an Analog-to-Digital Converter (ADC). Its simple three-pin header (VCC, GND, SIG) allows for quick integration into breadboarded circuits or custom enclosures without complex communication protocols.
Applications
Getting Started
Connect the SIG pin to an analog input on an Arduino or ESP32 and power the board with 3.3V or 5V. To prolong sensor life and prevent probe corrosion due to electrolysis, it is recommended to only power the sensor briefly during the measurement cycle rather than continuously.
Also Consider
SparkFun Electronics
- The same basic resistive sensor design but featuring screw terminals for more secure wire connections in outdoor environments.
