Adafruit STEMMA Soil Sensor - I2C Capacitive
Moisture Sensor
PRODUCT ID: 4026
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. Even if they're gold plated! The resistivity
measurement goes up and up, so you constantly have to re-calibrate your code. Also,
resistive measurements don't always work in loose soil.
This design is superior with a capacitive measurement. Capacitive measurements use
only one probe, don't have any exposed metal, and don't introduce any DC currents into
your plants. We use the built in capacitive touch measurement system built into the
ATSAMD10 chip, which will give you a reading ranging from about 200 (very dry) to
2000 (very wet). As a bonus, we also give you the ambient temperature from the
internal temperature sensor on the microcontroller, it's not high precision, maybe good
to + or - 2 degrees Celsius.
To make it so you can use the sensor with just about any microcontroller, we have an
I2C interface. Connect a 4-pin JST-PH cable (we have a few stocked) to your
microcontroller or single board computer to 3-5V power, Ground, I2C SDA and I2C SCL
and then run our Arduinoor CircuitPython code to read the temperature and capacitive
measurement. No soldering required!
Please note: This is just the sensor, you'll also need a JST 4-PH cable to go along for
plugging it in! We have a few options such as one with male header pins, female header
pins, and a JST-JST cable. You can use Seeed Grove cables and boards to connect - the
Grove cable is a little different looking but will fit just fine.
TECHNICAL DETAILS
Product Dimensions: 76.2mm x 14.0mm x 7.0mm / 3.0" x 0.6" x 0.3"
Product Weight: 4.0g / 0.1oz
https://www.adafruit.com/product/3968 11‐19‐18
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