Which Power Supply?

I am going for power over ethernet. The switch below (from play.com) can power 4 ?'s, one splitter (from novatech) needed per ? and I have to find a jack plug to micro usb cable from somewhere. Play.com don't do splitters and novatech only have expensive PoE switches. After all the hassle needed to find those two distributors I am not shocked that the cable has to come from somewhere else.

TP-Link TL-SF1008P 8-port 10/100M PoE Switch

TP-Link TL-POE10R Power Over Ethernet Splitter

http://www.bnpcs.com have HDMI to VGA converters (Part number 466767-ZH1), but they cost about 2 ?'s.

Sorin said:

The cheapest solution for a PS is to get a Nokia AC-10E charger. It`s output is 1200 mAh, more than needed.

Just to say that for the UK, the equivalent Nokia charger (with 3-pins) is the AC-10X - same 1200mA output, and dirt cheap on Amazon or play.com for under £4 each.

Isceald Glede said:

I am going for power over ethernet. The switch below (from play.com) can power 4 ?'s, one splitter (from novatech) needed per ? and I have to find a jack plug to micro usb cable from somewhere. Play.com don't do splitters and novatech only have expensive PoE switches. After all the hassle needed to find those two distributors I am not shocked that the cable has to come from somewhere else.

TP-Link TL-SF1008P 8-port 10/100M PoE Switch

TP-Link TL-POE10R Power Over Ethernet Splitter

http://www.bnpcs.com have HDMI to VGA converters (Part number 466767-ZH1), but they cost about 2 ?'s.

http://www.play.com/PC/PCs/4-/.....oduct.html

but POE does not work on RPi - or does this do dsoemthing else

[rurwin]

The RPi cannot take its power from the Ethernet socket, but power can be put on the CAT5 cable and then split off before it gets to the RPi. That means that the RPi does not need to be close to a power outlet and there is only one cable to be run.

However, there needs to be a power splitter and a regulator external to the RPi but alongside it.

Deedee said:

May i please make a suggestion about both Power Supplies and SD cards.

There are so many threads about these and postings it can be awkward enough for some one with a little knowledge to follow.

Would it not be better to have a section pinned on the forum where simple information such as what, where and how much a suitable psu can be posted, and as important, what NOT to buy?

The same goes double for SD cards i think some of the experienced people in here are still scratching their heads over, and so again this information on what to buy and what Not to buy. I know nothing will be clear until we really have the device in our hands, but im sure there and some clear good and bad candidates already known of.

This would at least give people now and in the future a first place to go and look, and lets face it, out side a display, these are the two remaining things you need to run this device and the info should be more or less clearly available at your finger tips without having to read a hundred posts for some thing so critical to function.

With a VERY patient simle......

I have a Huawei mobile modem power supply with a mini usb plug but the voltage is 5.3.  Does anyone know if this excess voltage would damage the unit?

cheers

sean

daka said:

I have a Huawei mobile modem power supply with a mini usb plug but the voltage is 5.3.  Does anyone know if this excess voltage would damage the unit?

Generally speaking, no it won't directly damage the unit. I don't know exactly what kind of voltage regulators they use but even in the lack of any regulators (which is impossible) then 0.3V over voltage is not enough to damage any components, with some extreme bad luck you would get an unstable system or unpredictable behavior.

i purchased this USB hub to simply extend the usb ports of my pi.

http://dx.com/powered-7-port-u.....uded-18538

then i though maybe i can power the pi with it. I am trying to find out how much power each port outputs so far no luck. if it don't work then i will just use my cell phone charger.

grondinm said:

then i though maybe i can power the pi with it. I am trying to find out how much power each port outputs so far no luck. if it don"t work then i will just use my cell phone charger.

Generic USB hubs that have their own AC adapter will usually allow devices to draw as much current as they want right off-the-bat up to 1A or more.

So my guess is yes you can power the RPi from that USB hub.

USB power from a PC's USB jack will not work as those are by standard 100mA for all devices and maximum 500mA can be allowed after negotiation with the hardware..

Deedee said:

May i please make a suggestion about both Power Supplies and SD cards.

There are so many threads about these and postings it can be awkward enough for some one with a little knowledge to follow.

Would it not be better to have a section pinned on the forum where simple information such as what, where and how much a suitable psu can be posted, and as important, what NOT to buy?

The same goes double for SD cards i think some of the experienced people in here are still scratching their heads over, and so again this information on what to buy and what Not to buy. I know nothing will be clear until we really have the device in our hands, but im sure there and some clear good and bad candidates already known of.

This would at least give people now and in the future a first place to go and look, and lets face it, out side a display, these are the two remaining things you need to run this device and the info should be more or less clearly available at your finger tips without having to read a hundred posts for some thing so critical to function.

With a VERY patient simle......

The forum is being changed soon to a better system. If any more stickies are created before then it will cover almost the whole of the first page, rendering the forum practically unusable. What is really needs is separate sections. But there's no point doing any work on this one when it's going to be changed soon.

grondinm said:

i purchased this USB hub to simply extend the usb ports of my pi.

http://dx.com/powered-7-port-u.....uded-18538

then i though maybe i can power the pi with it. I am trying to find out how much power each port outputs so far no luck. if it don"t work then i will just use my cell phone charger.

That hub is the same one as discussed at http://www.raspberrypi.org/for.....sb-hubs.  See posts 7, 8 and 9.  The PSU supplied with yours may be different.  The power input socket on the hub is wired directly to the 7 "extension" sockets and to the USB "input" socket which is a bit naughty.  I sent mine back.

Yeah, it's unfortunate you can't really give the green light on a product that you can't physically test..

You can really only guarantee "it will work IF it does what it's supposed to do".. sadly that is not the case for many devices on the market.

grondinm said:

i purchased this USB hub to simply extend the usb ports of my pi.

http://dx.com/powered-7-port-u.....uded-18538

then i though maybe i can power the pi with it. I am trying to find out how much power each port outputs so far no luck. if it don"t work then i will just use my cell phone charger.

Thanks for the reply grondinm

sean

Isceald Glede said:

I am going for power over ethernet. The switch below (from play.com) can power 4 ?'s, one splitter (from novatech) needed per ? and I have to find a jack plug to micro usb cable from somewhere.

TP-Link TL-SF1008P 8-port 10/100M PoE Switch

TP-Link TL-POE10R Power Over Ethernet Splitter

Did you find a DC jack to micro usb cable? If so, could you share the links?

Planning on going down the same route you have taken. Cheers

[plugwash]

I suspect you will have to get out the soldering iron and make the cable to connect the Pi to the splitter.

[abishur]

plugwash said:

I suspect you will have to get out the soldering iron and make the cable to connect the Pi to the splitter.

+1

If solder isn't an option for you, you can also twist cap, electrical tape, or even hot-glue the wires together as long as you make sure to connect the right wires together and you make sure to insulate them properly when you are done.  You'll need to look at your PSU, but generally speaking the center wire is insulated and positive, surrounding the center wire is a bunch of thin copper wires, twist all these together and *generally* you have your negative wire.  On the micro usb side pin 1 (usually red) is your positive wire, and pin 5 (usually black) is your ground wire (typically there are only 4 wires as pin 4 is typically connected to pin 5)

plugwash said:

I suspect you will have to get out the soldering iron and make the cable to connect the Pi to the splitter.

Don't mind getting the old soldering iron out, but think I have another solution

Tp-Link TL-POE10R PoE Splitter-> DC 3.5mm 5V Male to USB Male -> Micro USB female to Mini USB male adapter -> Raspberry Pi

Anyone have any reasons why this shouldn't work? The only reason I am doing this I wish to attach to a mounted TV in the kitchen which has one ethernet cable which has POE and no plugs available.

http://www.play.com/PC/PCs/4-/.....fer=search

http://www.amazon.co.uk/1211-Q.....B004BVOXTS

http://www.amazon.co.uk/Starte.....B002O1S8IE

JLB said:

Tp-Link TL-POE10R PoE Splitter-> DC 3.5mm 5V Male to USB Male -> Micro USB female to Mini USB male adapter -> Raspberry Pi

Anyone have any reasons why this shouldn't work? The only reason I am doing this I wish to attach to a mounted TV in the kitchen which has one ethernet cable which has POE and no plugs available.

Only going by the pics, but the splitter looks like it's got a 2.1mm or 2.5mm power out socket. The 3.5 - USB cable doesn't look like it'll fit into that.

The cable also looks to have a normal USB A connector on the other end.

Your adapter appears to have a micro usb socket which a normal USB A isn't going to fit.

Also that adapter looks to be the opposite to what you need, the plug end is mini usb where you'd need it to be micro usb.

Don't get me wrong, it's a perfectly valid idea to to something like this, I'd just check that all your adapters and cables fit together properly.  From those pics, it doesn't look like it to me.

Yes you are correct, a bit of googling, the jack is 2.5mm on the splitter and I posted the wrong link for the adapter, need USB -> Micro

Thanks for spotting my mistakes

So 700ma is the absolute maximum the Pi will draw with ethernet connected, and 2 USB devices drawing full power, and the Pi itself drawing the maximum amount of power it can?

After reading that its not a good idea to power the pi from a USB hub/PC I have bought http://www.ebay.co.uk/itm/330717731492 ready for my pi to be delivered. Arrived next day