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Product description: Capacitive Soil Moisture Sensor - I2C Qwiic - SparkFun SEN-30480
SparkFun 's capacitive soil moisture sensor with a Qwiic I2C interface is designed for long-term monitoring of soil and gardening substrate hydration. Unlike traditional resistive sensors, the module utilizes an internal capacitive electrode embedded in the PCB structure , eliminating exposed metal probes susceptible to corrosion. This significantly increases the sensor's durability when operating in humid environments. The measurements are handled by the CY8CMBR3102 Capsense Express chip , which communicates via an I2C bus. The sensor also features a printed ruler in metric and imperial units, allowing for maintaining a constant measurement depth. The module has a programmable STATUS LED that can signal when the soil moisture level is too low.
Capacitive Soil Moisture Sensor - I2C Qwiic - SparkFun SEN-30480.
The capacitive soil moisture sensor is perfect for intelligent irrigation systems, garden automation and Smart Home projects.
Main features of the soil moisture sensor
- Capacitive humidity measurement : no exposed electrodes for increased corrosion resistance
- I2C communication : convenient integration with microcontrollers and the Qwiic system
- CY8CMBR3102 chip : Capsense Express controller responsible for handling capacitive measurements
- Programmable I2C address : default address 0x37 can be changed by software
- Two Qwiic connectors : easily connect multiple devices on a single I2C bus
- Built-in ruler : mm and inch markings allow for repeatable measurements at the same depth
- STATUS LED : visual indication of humidity level
- Ready-made libraries : support for Arduino, Python, MicroPython, and CircuitPython
Capacitive Soil Moisture Sensor Pinout and Compatibility
The module uses two Qwiic connectors that provide power, ground, and I2C communication over a single cable. This allows the sensor to be connected without soldering to Qwiic-compatible boards, such as the SparkFun RedBoard Qwiic or SparkFun RedBoard IoT ESP32. The two connectors also allow for convenient connection of additional I2C devices on a single bus. The sensor communicates via the I2C bus with a default address of 0x37 , which can be changed software-wise. The module works with Arduino, Raspberry Pi, ESP32, MicroPython and CircuitPython-compatible platforms , and other microcontrollers that support I2C. The manufacturer provides ready-made libraries for the Arduino IDE and Python environments.
Thanks to its corrosion resistance, it can operate for long periods in a humid environment.
The built-in ruler makes it easy to take repeat measurements at the same depth.
Sensor technical specifications
- Sensor type: capacitive soil moisture sensor
- Communication interface: I2C
- Default I2C address: 0x37
- Control unit: CY8CMBR3102 Capsense Express
- Connectors: 2x Qwiic
- STATUS LED: blue, programmable
- Power LED: red
- Measuring ruler: mm and inches
- Compatibility: Arduino, ESP32, Raspberry Pi, MicroPython, CircuitPython, Qwiic
Contents of the set
- 1x Capacitive soil moisture sensor
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