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I'm not sure that cost is the biggest problem. PoE splitters with USB ports can be had for ~$20. Though, relative to an RPi, I guess that is somewhat expensive.

I'm not sure that cost is the biggest problem. PoE splitters with USB ports can be had for ~$20. Though, relative to an RPi, I guess that is somewhat expensive. Ex: https://www.amazon.com/gp/aw/d/B019BLMWY0 https://www.amazon.com/gp/aw/d/B019BLMWY0 (note, I haven't actually used this product). A quick ebay search shows some that are ~$5, so I'd imagine it wouldn't be all that hard for an experienced board developer to get the price lower at higher production rates.

blindfly 10y ago
Those cheap eBay items you reference are likely just sending power over an unused pair. Actual standardized PoE has all sorts of other cool perks. I haven't studied it heavily but I wouldn't say they're quite the same as the little dongles with a plug off the side.
jtnews 10y ago
Here's another one that's a brand you may have heard of and it also does multiple voltages too. Only $15. Can even get it as a kit if you don't have a Poe switch. https://www.amazon.com/gp/aw/d/B003CFATQK/ref=mp_s_a_1_1?ie=UTF8&qid=1469245044&sr=8-1&pi=SL75_QL70&keywords=poe+injector&th=1&psc=1 https://www.amazon.com/gp/aw/d/B003CFATQK/ref=mp_s_a_1_1?ie=...