Resources:
Grove – Capacitive Moisture Sensor (Corrosion Resistant) Eagle Files
NE555DR Datasheet

Grove Capacitive Soil Moisture Sensor (Corrosion Resistant) Seeed Studio
The Grove Capacitive Soil Moisture Sensor (Corrosion Resistant) is a highly reliable and durable soil-moisture detection module designed for long-term agricultural, gardening and IoT applications. Unlike traditional resistive sensors, this module uses capacitive measurement to detect changes in soil moisture, ensuring excellent corrosion resistance and extended lifespan. At its core is the NE555DR precision timing IC from Texas Instruments, paired with an onboard amplifier to deliver stable, accurate capacitive sensing performance. The Grove interface provides true plug-and-play connectivity, while the long straight pad acts as the probe for effective moisture data collection. Supported by Seeed Studios extensive tutorials, documentation and community projects, this sensor is ideal for smart irrigation, hydroponics, soil analysis and beginner-friendly environmental monitoring setups.
Key Features

Corrosion-Resistant Design: Capacitive sensing eliminates probe oxidisation, offering long-lasting soil-moisture measurement.
Powerful IC Integration: Equipped with TIs NE555DR timing IC and built-in amplifier for stable and accurate capacitive readings.
Plug-and-Play Grove Interface: Simple connection for quick data transmission without soldering.
Effective Probe Design: Long straight measurement pad collects soil moisture data consistently.
Starter-Friendly: Includes detailed guides, tutorials and community resources for easy learning and rapid prototyping.

Hardware Overview