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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