Gravity: Analog Soil Moisture Sensor
Overview
The SEN0114 is a simple soil moisture sensor designed for use with the DFRobot Gravity ecosystem. It operates by measuring the conductivity between two exposed metal probes to estimate the moisture level of the surrounding medium. This analog sensor is compatible with microcontrollers operating between 3.3V and 5.0V, providing a linear voltage output corresponding to the soil's water content.
Why Choose This Part
The sensor features a plug-and-play Gravity interface that simplifies wiring and eliminates the need for soldering during prototyping. Its wide input voltage range (3.3V to 5V) allows for direct integration with both low-power MCUs and standard 5V Arduino boards. The immersion gold surface finish on the probes provides better corrosion resistance compared to standard copper-only PCB sensors.
Applications
Key Specifications
Getting Started
Connect the sensor to an analog-to-digital converter (ADC) pin on an Arduino or ESP32 using the included Gravity 3-pin cable. In code, use a simple analogRead() function to interpret values between 0 (dry) and roughly 950 (submerged in water). Ensure the sensor is calibrated for your specific soil type, as different substrates will yield different conductivity results.
Also Consider
SparkFun Electronics
- A minimalist resistive sensor board for applications where a standard 0.1 inch header is preferred over the Gravity connector.
