W5100 Ethernet module PoE

[SebDominguez]

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 !

[SebDominguez]

Nobody ?

[pjeterinfo]

Are 7 and 8 not both gnd?

[SebDominguez]

In standard PoE yes, but I'm trying everything here and I can't get current on those pin.
I'v tried V+ on pin 8 and V- on pin 7, V+ on pin 4, 5, V- to pin 7, 8 and still nothing...

this guy : http://hazymat.co.uk/2015/01/home-automation-poe-with-arduino-in-praise-of-diy-poe/ had the same issue...

Is it possible that this ethernet breakout has "fake" PoE label ?

[pjeterinfo]

This module doesn't seem to have a 48v dc/dc converter. At least from the picture I do not recognize it.
Allso I don't see in the description that it have power over ethernet.

[SebDominguez]

There isn't any DC/DC converter, but there is 2 pin dedicated to PoE according to the labels on the PCB

[poldim]

Did you have any luck on solving this?

[Niun]

Hi, ive had the same Problem...
According to the datasheet from the rj45 port, poe is not possible in this circuitry.
http://www.kosmodrom.com.ua/pdf/HR911105A.pdf

[SebDominguez]

To close this topic : this particular module doesn't have anything close to PoE (passive nor active)

The PoE labels on the board are Fake or leftover.

[Rpx]

Hi, sorry for the delay, I had just read your post and I could said "me too"
But I solved the problem and it works for two years now.
I explain my solution here, if the French don't afraid you.
https://easydomoticz.com/forum/viewtopic.php?f=20&t=6497
I resume, a 7.5volts power supply, a passive injector, and a spécial home-made cable to bypass the RJ45 socket. The 7.5 v go to Vin-Gnd of the Nano to produce 5v wich is returned to the W5100. QED.

Rpx.