Adafruit STEMMA Soil Sensor User Guide

This guide explains how to use the Adafruit STEMMA Soil Sensor, an I2C capacitive moisture sensor that measures soil moisture and temperature without…


Adafruit STEMMA Soil Sensor User Guide - cover page
Brand
Adafruit
Document type
User Manual
Language
English
Pages
19
File format
PDF
File size
2.5 MB
Published
17 October, 2026
Updated
17 October, 2026
MD5 checksum
BF0B5149185CEDF552997169649AEF1A

About this manual

The document describes the Adafruit STEMMA Soil Sensor, a capacitive moisture measurement device designed to avoid oxidation issues found in resistive sensors. It features a built-in ATSAMD10 chip with capacitive touch measurement capabilities, providing readings ranging from approximately 200 (very dry) to 2000 (very wet), along with ambient temperature data.

What's inside

  • Overview
  • Pinouts
  • Arduino Test
  • Python & CircuitPython Test
  • Installation of seesaw Library
  • Usage WipperSnapper

Frequently asked questions

How do I calibrate my STEMMA Soil Sensor to return volumetric water content (VWC)?

You can't. This soil sensor provides only a capacitive measurement.

What are the seesaw registers for the soil moisture value?

The Base register is 0x0F and the Function Register is 0x10.

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