Soil Moisture Sensor

Overview

A basic resistive soil moisture sensor — two exposed probes measure conductivity through the soil, which increases as moisture increases.

Key Specs

Pinout

VCC, GND, AO (analog out), DO (digital out)

Features

• Low cost, simple to use
• Adjustable threshold via onboard potentiometer

Compatible With

Arduino, ESP32, ESP8266, Raspberry Pi

Use Cases

• Plant watering automation
• Basic garden monitoring

FAQ

Does it corrode over time? Yes — the exposed metal probes can corrode with prolonged soil contact; for longer-term installs, consider the capacitive version instead.