Description

The Adafruit STEMMA Soil moisture sensor is a durable capacitive moisture sensor compatible with just about any microcontroller / single board computer. These are perfect for keeping tabs on your plants or feeding back data to your own custom irrigation system.

Unlike most low-cost resistive soil moisture sensors, these measure the capacitance of the soil instead. While resistive sensors may work well at first, they tend to oxidize, have to be recalibrated over time, and have trouble measuring in loose soil. This capacitive sensor is far superior as it works much better in loose soil, doesn’t introduce DC current into your plants, and doesn’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.

These sensors can be easily connected to our Raspberry Pi Irrigation and Raspberry Pi Weather board using the I2C header. Each sensor has a pair of address select pins, enabling up to 4 sensors to be used on a single I2C bus.

Please note: This is just the sensor, you’ll also need a JST 4-PH cable cable to go along for plugging it in!

Features

• 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

Package Contents

• 1 x Adafruit STEMMA Capacitive Moisture Sensor

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