11 replies to this topic

[n0rad]

It will be nice to power the board through Power Over Ethernet. It's an important feature that I really need on my domotic project, is it plane ?

[Eric Burdo]

It will be nice to power the board through Power Over Ethernet.
It's an important feature that I really need on my domotic project, is it plane ?

I've never tried it... but you could start here:

http://www.freetroni...net-for-arduino

They also have a shield for PoE too.

[avword]

It will be nice to power the board through Power Over Ethernet.
It's an important feature that I really need on my domotic project, is it plane ?

Try this out:
http://www.trendnet....TPE-102S&cat=58

[freds]

Try this out:
http://www.trendnet....TPE-102S&cat=58

POE is way different in voltage specifications then required by the netduino, it is designed to deliver 15watts or more at 44 to 57 volts. So way past the 12v max for netduino.

Not to say someone could come with a inline tap that could bring it down to something reasonable.

[Steven Behnke]

POE is way different in voltage specifications then required by the netduino, it is designed to deliver 15watts or more at 44 to 57 volts. So way past the 12v max for netduino.

Not to say someone could come with a inline tap that could bring it down to something reasonable.

It also adds a rather considerable amount to network switches. Most people don't have a few thousand to get a decent POE switch who are building hobby electronics.

Well, it used to be outrageously expensive. It appears you can get an 8 port PoE gigabit switch for $139 now or so.

Edited by Steven Behnke, 29 September 2010 - 12:15 AM.

[bill.french]

linksys 5v poe

This injector puts in 48v but spits out 5v.

[avword]

POE is way different in voltage specifications then required by the netduino, it is designed to deliver 15watts or more at 44 to 57 volts. So way past the 12v max for netduino.

Not to say someone could come with a inline tap that could bring it down to something reasonable.

Did you look at that link? The trendnet device that I linked to features:
Supports Adjustable Output 5V, 7.5V, 9V, 12V

[greg]

Did you look at that link? The trendnet device that I linked to features:
Supports Adjustable Output 5V, 7.5V, 9V, 12V

It's all kind of moot unless the netduino has both the code (firmware) and the hardware to support taking in the power.

(Although I think it would be a cool feature to have!)

[CW2]

the hardware to support taking in the power.

Actually, it is possible to supply power via V_IN pin, voltage slightly above 6V should be enough to get stable 5V line. Power from USB connector is automatically disconnected when V_IN voltage is detected (either from power jack or V_IN pin, which are physically connected).

[avword]

It's all kind of moot unless the netduino has both the code (firmware) and the hardware to support taking in the power.

(Although I think it would be a cool feature to have!)

No firmware or hardware needed...

I think everyone is misunderstanding my link. The device I posted extracts power from an powered ethernet line and then converts it to one of the voltages for powering devices that don't support POE.
The netduino has a 7.5 - 12 VDC power input in the lower left the unit. The trendnet device has a power output. Run a cable from the trendnet power output to the power input on the netduino.

• Splits power and data from a single Ethernet cable into two separate sources
• Use this with a TRENDnet PoE switch to power and network a non Power over Ethernet device
• Save on installation and equipment costs

[greg]

No firmware or hardware needed...

I think everyone is misunderstanding my link. The device I posted extracts power from an powered ethernet line and then converts it to one of the voltages for powering devices that don't support POE.
The netduino has a 7.5 - 12 VDC power input in the lower left the unit. The trendnet device has a power output. Run a cable from the trendnet power output to the power input on the netduino.

• Splits power and data from a single Ethernet cable into two separate sources
• Use this with a TRENDnet PoE switch to power and network a non Power over Ethernet device
• Save on installation and equipment costs

Oh - I thought it was an injector - I see what you're saying. Now THAT is a pretty neat piece of tech. An ethernet power supply. I might have to pick up one of those.

Sorry - as a network engineer I'm used to the host device pulling power off the pins and not adding a separate board.

[Jonathan Oxer]

Regarding the Ethernet shield with PoE support that Eric referenced above, I heard a couple of days ago from a customer that they've successfully used it with a Netduino so I can confirm that it's compatible. That shield extracts the power and exposes it on a header that can be used to send it through to the VIN pin either directly (if the voltage is low enough) or via a regulator daughter-board. There's more info on the PoE tutorial page that Eric linked to, and also on the product page: www.freetronics.com/ethernet-shield.