Article: Simple Raspberry Pi Fun Without a Power Supply

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If you only need POE for a single device you can get an AF (15 watt) injector for your non-poe switches for $20.

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There is a fanless PoE 802.11af HAT

 

GAF-PiHAT-FBA

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Just now, The Computer Audiophile said:

Very cool. I haven't tested it, but for $25.99 the risk isn't much.

 

https://amzn.to/2ZZaVAQ

 

This one looks like it can deliver the full 3 AMP for the Pi 4. 

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12 minutes ago, The Computer Audiophile said:

This one says it for sure works on the Pi 4B, whereas the other was contradictory.

 

LoveRPi Power-Over-Ethernet (PoE) HAT for Raspberry Pi 4 Model B and Raspberry Pi 3 Model B+ (Professional, Isolated (3KV))

 

https://amzn.to/2BlkM9D

 

 

Looks like this one has clearance for the CPU so you could still use a passive heatsink. 

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Here's an external splitter:

$11

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19 minutes ago, MikePM said:

Great article.  My question is the overall merit of doing PoE.  I can get a PoE switch that injects power into the system relatively cheaply, but does it also add noise generally or otherwise degrade other parts of the system.  If its one device, maybe just adding power to the R Pi would be better?  

 

Or just get a power injector for that particular port. It all happens upstream of the switch.  Getting one in today. I'll let you know how it goes. 

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Have the $11 external POE splitter on my 3B + and works like a charm: