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DFRobot Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant. INTRODUCTION This product measures soil mositure levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor. It is made of a corrosion resistant materal giving it a long service life. Insert it into soil and impress your friends with the real-time soil moisture data! The product includes an on-board voltage regulator which gives it an operating voltage range of 3.3 ~ 5.5V. It is compatible with low-voltage MCUs (both 3.3V and 5V logic). To make it compatible with a Raspberry Pi, an ADC converter is required. This sensor is compatible with our 3-pin ‘Gravity’ interface, which means it can be directly connected to the Gravity I/O Expansion Shield. The following image shows an example project – a device that notifies you when a plant needs to be watered. APPLICATIONS Gardening & Farming Moisture Detection Intelligent Agriculture SPECIFICATION Operating Voltage: 3.3 ~ 5.5 VDC Output Voltage: 0 ~ 3.0VDC Interface: PH2.0-3P SHIPPING LIST Capacitive Soil Moisture Sensor x1 Analog Sensor Cable x1. DFRobot Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant