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I'm still hoping for someone to build a SBC like the RPi that takes POE for power. USB is convenient for general use, sure, but for something like this cluster

by web007 10y ago

I'm still hoping for someone to build a SBC like the RPi that takes POE for power. USB is convenient for general use, sure, but for something like this cluster it would be ideal to have a single wire in and out. Unfortunately it's probably a chicken-and-egg thing, where POE is too expensive until a lot of boards support it, and boards won't support it because it's too expensive.

paulfurtado 10y ago
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=...
jtnews 10y ago
I'm glad to hear someone else is interested in a Poe powered board. I thought about making a pihat that did Poe extraction but you'd still have to use a short cat5 jumper for data.
mistertrotsky 10y ago
You can now get a PoE adapter for the Raspberry Pi: https://www.pi-supply.com/product/pi-poe-switch-hat-power-over-ethernet-for-raspberry-pi/ https://www.pi-supply.com/product/pi-poe-switch-hat-power-ov...

by web007 10y ago

paulfurtado 10y ago

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=...

jtnews 10y ago

I'm glad to hear someone else is interested in a Poe powered board. I thought about making a pihat that did Poe extraction but you'd still have to use a short cat5 jumper for data.

mistertrotsky 10y ago

You can now get a PoE adapter for the Raspberry Pi: https://www.pi-supply.com/product/pi-poe-switch-hat-power-over-ethernet-for-raspberry-pi/ https://www.pi-supply.com/product/pi-poe-switch-hat-power-ov...