The Adafruit STEMMA Soil moisture sensor is a durable capacitive moisture sensor compatible with just about any microcontroller / single board computer. Most low cost soil sensors are resistive style, where there’s two prongs and the sensor measures the conductivity between the two. These work OK at first, but eventually start to oxidize because of the exposed metal and have to be re-calibrated over time. This capacitive sensor is far superior as they work far better in loose soil, don’t introduce DC current into your plants, and don’t have any exposed metal to corrode.
The sensor is actually an ATSAMD10 microcontroller with built in capacitive touch sensing. It acts as an I2C sensor and will return a value ranging from about 200 (very dry) to 2000 (very wet). As a bonus, Adafruit also provides the ambient temperature from the internal temperature sensor on the microcontroller, it’s not high precision, maybe good to + or – 2 degrees Celsius.
Please note: This is just the sensor, you’ll also need a JST 4-PH cable cable to go along for plugging it in!
- Input Voltage: 3-5VDC
- Intergrated Temperature Sensor
- Capacitive Sensing
- Dimensions: 76.2 x 14 x 7mm
- 4 selectable I2C addresses
- No exposed metal to corrode
STEMMA Soil Sensor: https://learn.adafruit.com/adafruit-stemma-soil-sensor-i2c-capacitive-moisture-sensor
This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.
This product is returnable Within 14 Days of delivery. Item must be unopened, unused, and in re-saleable condition.