[TriEmbed] Electric Fence monitoring

[Josh Wyatt]

Your solution looks pretty good to me; I might consider adding a couple of
capacitors to clean the waveform up a bit if you're just looking to detect
the pulse. Something like a .1uF between R2 and D2, and maybe a .01uF or
.001uF from A0 to ground.

Thanks,
Josh

On Fri, Jun 26, 2020 at 11:19 PM The MacDougals via TriEmbed <
triembed at triembed.org> wrote:

> 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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