Hello everyone !
I'm trying to supply power to my project using this breakout board W5100 and a PoE injector.
The board have PoE+ and PoE- pin directly connected on ethernet pin 8 and 7 but when I provide power through the ethernet cable, there isn't any power on PoE+ and PoE-.
Probably I'm doing something wrong...
Can someone give me a little help ?
Thanks a lot !
The CAT5 connector pins 7 and 8 are the ground (PoE-). The power (PoE+) is on pins 4 and 5. Have you checked that on the cable?
I'll try that.
I'v only tested the pin 7 and 8 because PoE- and PoE+ are directly wired on those pin on the RJ45 stone
Thanks !
Hello again !
I'v tested sending 12v on pin 4, 5 and 0v to pin 7, 8 and I don't have any current on PoE+ and PoE-...
I'v asked to the author of this article : Home Automation PoE with Arduino – in praise of DIY PoE! – Mat's Hideout
and he doesn't find a way to use PoE- and PoE+ either...
I'v tried to test continuity between each pin of the connector, and there isn't any...
What kind of black magic there is inside this thing?
It appears by the pin out of that socket that those PoE+ and PoE- are connected to pins 7 & 8. Both those should be the ground. Pins 4 & 5 are V+.
So how should I provide V+ and V- to get current on PoE+ and PoE- pin on PCB side ?
My PoE is also not doing much and I dont know why as I use a PoE compatible ethernet shield.
I also have question, my ethernet cable comes from my linksys router WRT54G, which gets it's power from it's own original adapter.
If I plug my arduino + ethernetshield + PoE in this linksys router using the right ethernet cable, I should get power right?
So am I missing something? or do I got myself a broken PoE module?
@bask185: You need a PoE injector between the router and the ethernet shield. If that is what you mean, then yes, you are good to go. Insure the PoE injector is a passive unit. Active PoE injectors use the data lines also. That would be bad for your ethernet shield.
@SebDominguez: I don't see a way to get PoE off that board. The traces for PoE+ and PoE- are connected to pins 7 and 8 on the socket. Here is a link to a pic of the pinout.
http://www.kosmodrom.com.ua/pdf/HR911105A.pdf
Without the PoE+ connected to pins 4 and 5, you will get no power. Pins 7 and 8 are both ground. And that is not taking into account the circuit board may have pins 4 and 5 grounded. That would be really bad for your power supply and PoE injector.
@SurferTim, thank you. Though I made a whole topic out for me problem, I didnt get 1 single usefull response. And now I finally know why I have no power. Tnx, really tnx alot 
@SurferTim, thank you. Though I made a whole topic out for me problem, I didnt get 1 single usefull response. And now I finally know why I have no power. Tnx, really tnx alot
SurferTim:
@SebDominguez: I don't see a way to get PoE off that board. The traces for PoE+ and PoE- are connected to pins 7 and 8 on the socket. Here is a link to a pic of the pinout.
http://www.kosmodrom.com.ua/pdf/HR911105A.pdfWithout the PoE+ connected to pins 4 and 5, you will get no power. Pins 7 and 8 are both ground. And that is not taking into account the circuit board may have pins 4 and 5 grounded. That would be really bad for your power supply and PoE injector.
Thanks you for your clear answer 
I'll try to hack this module, changing the RJ45 connector with one that doesn't have 4, 5 grounded.
You might be able to make it work with a custom CAT5 cable, but you should be careful if you attempt that.
I'm the guy who wrote that blog post... amusingly I find myself back here after random google searches years later.
I still didn't get it working.
Also, @SurferTim says about hacking the CAT5 cable, I already did that.
If I recall correctly I checked the schematic for the magjack and the one used in the W5100 red board doesn't appear to support PoE. (My understanding may be incorrect on that one as I don't know much about how magjacks work, other than they are black magic ways of interference avoidance, and they don't simply pass the connections from the CAT5 cable right through to the W5100 chip!)
Given the above, I'm now planning on finding a way to incorporate the W5100 circuitry onto my own board that does other things, thus saving space and allowing for PoE. I'll try to remember to feed back here if / when I manage that.