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CDC for soil moisture sensor

Question asked by AKG on Apr 13, 2014
Latest reply on Apr 30, 2014 by seanbrown

Hi!

Has anyone tried any of the CDCs (like AD7745) for soil moisture application? I tried using a different CDC from ZMDI but it didn't work. What I observed was the reading was stuck to ~18pf for different levels of moisture. Do you think AD7745 will work for our sensor?

 

Or is there a chip that shifts frequencies (in Mhz) with a capacitor input?

 

Thanks in advance!

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