I am using a ne555 configured as an astable multivibrator to measure the "wetness" in soil. The higher the resistance (the soil is dry), the lower the frequency coming out of the 555. This signal then goes to a lm2907 frequency to voltage converter that determines when the water pump should kick in. My problem is that the 555 outputs DC frequency and the 2907 wants AC.. Is there an easy way to convert the signal to AC or is there any other way to do this?
I attached an example from the datasheet that shows what I want to accomplish..
Thankful for any help!
/ Christian
I attached an example from the datasheet that shows what I want to accomplish..
Thankful for any help!
/ Christian
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