29 Aug '14, 2pm

Bit-banging Ethernet On An ATTiny85

Bit-banging Ethernet On An ATTiny85

There are other reasons besides POE that you might want isolation. I have been shocked by holding the end of an Ethernet cable in one hand, and touching a grounded chassis with the other. Connecting a meter, I found the Ethernet wires capable of delivering ~90VAC while open, or ~3mA while grounded, both fluctuating over time. I’m certain no POE was present. The cable was run through the attic, and I suspected it was directly parallel to an AC line, picking up energy inductively. Seemed like a lot of energy to be accounted for by inductive coupling, but it wasn’t my job to further diagnose it. A few years later, I heard they found the electrical system had some “ground loop” issues, that required some serious rewiring to correct. Which probably wasn’t limited to actual grounds. The building is powered by three pole transformers, and I bet some of the hot or neutral lines fr...

Full article: http://hackaday.com/2014/08/29/bit-banging-ethernet-on-an...

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