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!