But it won't be, because there are fat resistors between the relays and the real ground point.
I don't know the resistance of my house when I am on the second floor, so I made up that resistance.
If I establish that circuit, will I actually induce a voltage / current between the Earth and A0?
Are you talking about a parallel circuit? In parallel circuits, current is shared between the paths, but the one with lower resistance will get more current.
If the + terminal is 5V, the voltage across the relays won't be 5V due to the resistors, I think.
But, the voltage in the parallel circuits should be the same, or am I wrong again?
Sorry, I prefer to work with graphics.
In Ground Loop 3.png, there would be a difference in earth reference between the left relay and the right relay, correct? So the voltage across the relays are not the same as each other.
How high off the ground is that rock? Ten feet, right?
I might get schooled here soon. :-)
Also lazy. ;-)
We've gotten away from your original quandry (why the capacitive sensing doesn't work from a battery).
Just so you know, we are having a conversation about the Earth and electricity ...
This convo isn't over yet
Maybe they should have a catagory for that.
What does "convo" mean? I searched it on Google, and found only "convoy".
I still don't get why if you stand on the Earth and touch to high voltage wire, you get hurt.
The path can't be through an insulator
the Arduino is very sensitive to the mains EMFs
if you test continuity from say the ground in an outlet to the actual dirt(stick the probe in the dirt yes) you actually get a short