ESP8266 Community Forum

- Thu May 18, 2017 8:06 pm #66064

Alternatively this:
https://www.ebay.com.au/p/?iid=27224880 ... s&&&chn=ps
Might have a better way to get different status.

In theory, sound ok?

Though the ESP only has 1 analog in, so I could not read the different states. Though inside something might be giving off different voltages..

- Thu May 18, 2017 9:59 pm #66067 The first link looks to be just an indicator, if it is going off. The second one is like the circuit I showed. Pretty expensive for both of them. I'll see what else I can dig up.

- Fri May 19, 2017 8:29 pm #66105 A 12 hour day at work and you figure during that time I would have an opportunity to look up the information on our fencer indicator design. But it was a busy day and I couldn't. I wanted to get some details but I will just briefly mention it now. We needed to add an indicator to show the fence condition. I don't really want to call it a voltage indicator as the range might not have been linear. But it did show different loading so it did what it needed to.

We added a wire through one of the output transformer's lamination holes. Not in with the high voltage wire's window area, but through the holes in the E portion.


It was away from any high voltage. We used one turn through that hole and got enough signal that we could send through a diode and into a capacitor. The voltage on the capacitor was measured by a bar graph display chip. It was quite effective.

I'l try and get more details but it would be on Tuesday if I can remember. (Long Weekend here )

- Mon Oct 28, 2019 10:29 am #84335 Hey,

could you gain some long term experience with your circuitry and like to share it here?

Maybe you could explain a little more exact how you designed the voltage Transformer ?

So far i could only figure out this project here (https://github.com/kiu/lofence/) which uses a non isolated Resistor Voltage Divider to set the voltage down and thus depends on the battery power for isolation. With an ESP8266 i would have used a AC Mains Power supply - thus the detection should really be isolated

Best Wishes from Germany,
Markus