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Old 2012-12-02, 23:45   #1
fivemack
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Default Things that unaccountably don't exist

I'd like a power strip with four or six outlets and an Ethernet port, running a Web server which will report at any time the instantaneous power use from each of the six outlets.

As far as I can tell, these exist but are called 'Metered-by-outlet Rack PDUs', have 24 or so outlets, and sell for many hundred dollars.
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Old 2012-12-03, 18:35   #2
f1pokerspeed
 
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Dedicate 1 port to a USB charger, add a USB battery and link it to a portable router (if possible). Then use multi-plug adapters and a Kill-a-Watt on each.

Not really practical, but it may work.
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Old 2012-12-03, 19:20   #3
chalsall
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Quote:
Originally Posted by fivemack View Post
I'd like a power strip with four or six outlets and an Ethernet port, running a Web server which will report at any time the instantaneous power use from each of the six outlets.

As far as I can tell, these exist but are called 'Metered-by-outlet Rack PDUs', have 24 or so outlets, and sell for many hundred dollars.
Further to f1pokerspeed's above, why limit the solution space to Ethernet?

Since this is read-only, USB would be much cheaper to implement.
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Old 2012-12-03, 20:07   #4
xilman
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Quote:
Originally Posted by chalsall View Post
Further to f1pokerspeed's above, why limit the solution space to Ethernet?
Remote accessibility?
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Old 2012-12-04, 10:06   #5
ig1
 
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You could always plug the USB devices into the web server you are monitoring and remote access that server to get access to the USB data.
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Old 2012-12-04, 11:09   #6
fivemack
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Quote:
Originally Posted by f1pokerspeed View Post
Dedicate 1 port to a USB charger, add a USB battery and link it to a portable router (if possible). Then use multi-plug adapters and a Kill-a-Watt on each.
Umm, I wasn't aware that Kill-a-Watt had output other than to the LCD screen on the front.

I'd be happy to buy one kill-a-watt per server, but figuring out how to rig up a webcam and OCR software to transfer the output from the screen to the digital world (or how to dismantle a kill-a-watt safely to get some LCD-driver pin attached to an input pin on a microcontroller board) seem like quite a lot of work. I have microcontroller boards (TI were selling https://estore.ti.com/Stellaris-LaunchPad.aspx at an initial price of five dollars, now risen to the not-very-impractical heights of $12.99) but I don't have EE experience.

Last fiddled with by fivemack on 2012-12-04 at 11:10
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Old 2012-12-04, 19:15   #7
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Quote:
Originally Posted by fivemack View Post
I'd be happy to buy one kill-a-watt per server, but figuring out how to rig up a webcam and OCR software to transfer the output from the screen to the digital world (or how to dismantle a kill-a-watt safely to get some LCD-driver pin attached to an input pin on a microcontroller board) seem like quite a lot of work.
Just follow the instructions: http://www.ladyada.net/make/tweetawatt/
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Old 2012-12-04, 19:33   #8
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Just follow the instructions: http://www.ladyada.net/make/tweetawatt/
It is fascinating that someone dreamed this up and is marketing the modifications.
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