The Capacitive Soil Moisture Sensor (Corrosion Resistant type) is an upgraded soil moisture sensor widely used in agriculture, gardening, and environmental monitoring to measure the water content in soil. Unlike resistive sensors, which use exposed metal probes and corrode easily, the capacitive version is designed to be more durable and long-lasting. Here are the details and explanation: 🔹 Features: Capacitive sensing principle – measures soil moisture by detecting changes in capacitance, not conductivity. Corrosion resistant – no exposed metal electrodes, which prevents oxidation and rusting. Wide voltage compatibility – typically works with 3.3V to 5V, making it suitable for Arduino, ESP32, ESP8266, Raspberry Pi, etc. Analog output – provides a continuous analog signal proportional to soil moisture level. Better accuracy & stability compared to resistive soil moisture sensors. 🔹 Specifications: Operating Voltage: 3.3V – 5.5V Output Type: Analog voltage signal Material: PCB with corrosion-resistant coating Moisture Detection Range: 0% – 100% relative soil moisture Size: Around 99 mm x 23 mm (varies by manufacturer) 🔹 Working Principle: The sensor contains a PCB-based capacitor that changes its capacitance when inserted into soil. Dry soil has lower dielectric constant → lower capacitance → lower output voltage. Wet soil has higher dielectric constant → higher capacitance → higher output voltage. The output analog signal can be read by an ADC pin of Arduino or microcontroller to estimate soil moisture percentage. 🔹 Applications: Smart irrigation systems – automatically turn on water pumps when soil is dry. Greenhouse monitoring – maintaining optimal soil conditions. Agriculture and precision farming – measure and optimize water usage. DIY gardening projects – connect with Arduino, Raspberry Pi, or ESP8266 IoT setups.