[TriEmbed] Electric Fence monitoring

[The MacDougals]

My electric fence monitoring project is making progress.

 

Attached is a scope shot of the signal I am trying to monitor.

There are two issues I want to address before putting this signal on the A0
pin of my ESP8266 development board (D1 mini).

The spike to ~5 volts is concerning.  I think I can use a 3.3v Zener diode
to suppress this.  Installed between my signal and ground with the banded
end away from ground.

The negative lobe of the signal is also concerning.  Can I just use a diode
in series here?  Banded end toward the A0 pin.  I can adjust the voltage up
a bit to compensate

for voltage drop across the diode.

 

I have drawn up a schematic of what I think is the solution.

 

Thanks for any comments.

 

---> Paul

 

 

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