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Capacitive moisture sensor with PIC16F877A

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Hello,can some body let me know how I can proceed for implementing a moisture meter with capacitive sensor and PIC16F877A;I get one sensor (Capacitive) but I do not know its properties;its is with a square wave oscillator made by 74HCT14 and one ceramic capacitance;With documentation I got many texts but not well understandable for me.can you plz help me to know how I can convert make conversion from frequency to moisture .

The compiler I want to use is CCS C Compiler.

Thanks
 

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