Solved PoE to USB for a Raspberry Pi
-
If I give you a dollar, would you learn how to spell "Raspberry"?
-
@RojoLoco said in PoE to USB for a Rasspberri Pi:
If I give you a dollar, would you learn how to spell "Raspberry"?
Probably not, I'm horrible at spelling words in English, and it's the only language I speak well
-
@gjacobse said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
I've got an EdgeRouter X SFP at home, and a nice chunk of some bonus money on an Amazon gift card. Wondered if anyone's used those PoE to USB adapters and if you'd recommend on over another? Thinking about powering a Rasspberri Pi through it for now.
The thought originated in ERL vs ER.
I know of the Pi PoE Hat - which may suit your needs
https://www.pi-supply.com/product/pi-poe-switch-hat-power-over-ethernet-for-raspberry-pi/
https://www.pi-supply.com/wp-content/uploads/2015/06/919A2176-Copy.jpg
That's neat, but a generic usb power would be even more useful for me. I've got a number of different "development" boards like the rPi3, it's just that the rPi is the largest power draw. Guess I should have specified, sorry.
-
-
Same thing on ebay for cheaper
http://www.ebay.com/itm/like/162305074483?lpid=82&chn=ps&ul_noapp=true
-
@NerdyDad Yep, exactly like that. I'm going to grab it on Amazon even tho it's a little more just because I have that gift card I can use.
-
http://i.ebayimg.com/00/s/ODAwWDgwMA==/z/bRoAAOSw-0xYgDup/$_35.JPG?set_id=880000500F
Ah okay,.. yea that is a bit different, I had seen those as well, but wasn't the first thing that came to mind at the time.
-
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
-
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
-
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
Big difference
-
@Dashrender said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
Big difference
Yep, kinda like the Mississippi River in Louisiana is small kinda difference.
-
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
Big difference
Yep, kinda like the Mississippi River in Louisiana is small kinda difference.
I don't get the reference.
-
@Dashrender said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
Big difference
Yep, kinda like the Mississippi River in Louisiana is small kinda difference.
I don't get the reference.
Apparently I'm doing bad analogies, that river is absolutely huge. Kinda like the slight difference between the SFP and POE model routers.
-
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
@travisdh1 said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
It is, I have a different model. Actually, I think it's an ER-POE, not ER-X-SFP like I said in the first post, doh.
Big difference
Yep, kinda like the Mississippi River in Louisiana is small kinda difference.
It's small if you are from New York or Brazil.
-
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
The ER-X is not PoE at all. It can draw power from a PoE injector, and it can pass through that PoE to eth4, but it does not provide PoE
-
@JaredBusch said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
The ER-X is not PoE at all. It can draw power from a PoE injector, and it can pass through that PoE to eth4, but it does not provide PoE
Actually, sorry sir, you are mistaken. If you plug into the way, you do get POE out on the POE out port.
at 13:20 into this video he shows it working. https://www.youtube.com/watch?v=SianDqAQaR0 -
@Dashrender said in PoE to USB for a Rasspberri Pi:
@JaredBusch said in PoE to USB for a Rasspberri Pi:
@Dashrender said in PoE to USB for a Rasspberri Pi:
I'm pretty ure the ER-X is passive POE, not standard IEEE 802.3af and 802.3at
The ER-X is not PoE at all. It can draw power from a PoE injector, and it can pass through that PoE to eth4, but it does not provide PoE
Actually, sorry sir, you are mistaken. If you plug into the way, you do get POE out on the POE out port.
at 13:20 into this video he shows it working.I can show all kinds of things working that are not designed for such.
The ER-X does not provide PoE. The ER-X is PoE passthrough.
The ER-X-SFP provides PoE.
http://dl.ubnt.com/datasheets/edgemax/EdgeRouter_X_DS.pdf
As for you video. Basic math will tell you that trying to do what he showed will fry your shit. A UAP-AC-LITE has a maximum power draw of 24V @ 6.5W which comes to a raw 0.27A. To produce 0.27A at 24V, the 12V adapter will need to use somewhere around 0.5A. The ER-X also has a listed maximum draw of 5W which works out to 0.41A The power brick is listed at 0.5A and you have a total draw of around 0.9A.
Just because someone on the internet plugs something in, and it works, does not mean it is a good idea to do so.
As for why it actually works? Well Ubiquiti does provide PoE on the SFP model, and the boards are the same minus that add on. So they probably never thought to put in something to disable it.
But when you burn your house down, it will not be their fault.
-
@JaredBusch said in PoE to USB for a Rasspberri Pi:
As for you video. Basic math will tell you that trying to do what he showed will fry your shit.
I agree that long term using the included power brick is probably a bad idea for the reasons you mentioned, the instructions, as shown in the video so specifically say, if you use a 12w brick, you can do 24V Passive POE on that port.
-
@JaredBusch said in PoE to USB for a Rasspberri Pi:
But when you burn your house down, it will not be their fault.
LOL do dramatic.
But, again, as the video showed - if you purchase a 12W power brick, then it is fully supported with no risk of a lack of amperage, and not more risk of house burning down than the ER-X SFP.
-
@Dashrender said in PoE to USB for a Rasspberri Pi:
@JaredBusch said in PoE to USB for a Rasspberri Pi:
As for you video. Basic math will tell you that trying to do what he showed will fry your shit.
I agree that long term using the included power brick is probably a bad idea for the reasons you mentioned, the instructions, as shown in the video so specifically say, if you use a 12w brick, you can do 24V Passive POE on that port.
FFS would you just stop already? Electricity is math not magic. Continuing to use a 12VAC power source will certainly fry your ER-X because of all the heat generated by the unit up converting a voltage level it is not designed to do. Using a higher watt supply does not change that fact.
