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FDC2212: Aplication in soil moisture

Part Number: FDC2212
Other Parts Discussed in Thread: FDC2214

hello,

I am now designing a kind of sensor to measure soil moisture. Some of the soil moisture sensor are cap sensors since different cap values means different levels of moisture. I want to use FDC2212 to measure its cap

value. Could you give me some ideas about how I can use FDC2212 to measure the cap value and could you also give me some suggestions about how to design the shape and size of the cap sensor. Besides is there

some rules when I am using the FDC2212? Thank you for your reply.