Play Room Media Centre: Hail the PiHub!!

In my previous post regards the development of a play room media centre, I cited one of the key goals was to attempt to build a solution that was going to be more green than other games/media centres on the market - and trying to keep the power consumption as low as possible.

Now there might just be something to help gain that all needed advantage, thanks to the pirate crew at PiMoroni - all hail the PiHub.  When I saw the post pop up about this earlier tonight, I was all set to go and buy one, damn the torpedoes!  Problem; they seem to be shipping with power packs for the UK and EU market.  Any chance that they could do one for the Australian market?

The Drawing Board
Looks like this post is therefore relegated to the drawing board.  So what was all my excitement about?  Given that I am still at the research and planning phase of my media centre project, I don't need to rush out and get a PiHub right this minute.  Well the PiHub is a powered four port USB hub built with the Raspberry Pi specifically in mind.  As you may recall from my previous post, my initial plans for a media centre incorporate USB keyboard, USB mouse, USB WiFi dongle, and USB HDD.  So that's four USB devices.  Now, if we configure the +RasberryPi so that it is drawing power from the PiHub, that means that we have just enough USB ports left on the Pi itself and the hub to cater to the four peripherals.  Great - that should then be quite tidy.

Shooting from the Hip
What we do know about the PiHub is that it's power pack supplies it with 3000mA (3A) of power.  My current Raspberry Pi power pack only supplies 1A, and consumes 36 W.  What I have not been able to discover yet is, how much power does the PiHub power pack consume?  For now, I am going to shoot from the hip and assume that since it's output is 3 times the amps of the Rasberry Pi power pack, its consumption is also 3 times greater.

If this assumption holds true, that means that the media centre project project built around a PiHub, would consume approximately 108W.  Based upon my initial research of the current media centre market makes it competitive.

From Here...
From here I need two things; to confirm the power consumption of the PiHub power pack, and to seek another edge to make my idea a worthy opponent of the current market products.

Play Room Media Centre: Keeping Ahead of the Curve

Following on from my last post, with any ideas of what we could do with a RaspberryPi in the #play_area, I need to make sure that I have some of the questions and answers squared away before introducing the ideas to my son. He's a smart, intelligent boy, with a great ability to conceivewhat could be done. But like all seven year olds, they don't necessarily handle failure and changes to plans once you start them on something. So, with any such projects, there is always going to be the necessary parental home work to be done upfront.

Play Room Functions

There are a number of needs that could be fulfilled within our son's play area. He loves watching his DVD/Video collection (my wife has an uncanny knack of finding old kids favourite videos in good condition!). He is also at an age where his musical tastes have and will continue to expand beyond the Wiggles, so playing music is also required. As all of these media can be digitised and served across our network - this all comes under the need for Wi-Fi media streaming. Though for the sake of our household Wi-Fi performance, it might be best if the majority of the children's content is available locally on the media centre.

Some of the programming that our son enjoys may be available from online/smart TV services line the ABC's iView service. However, other programs are not. Our experience is also that some smart TV devices are not compatible with the ABC's iView. So being able to watch free-to-air digital TV is desirable, but at the moment, we'll consider what hardware will be required to provision this, but not move to implement.

Games console. Don't ask how, but somehow we have existed all these years without owning a games console. No Xbox, no PS3, and no Wii. No we are not deprived and nor is our son. If anything there are times when he plays too many games already. However, as part of having a play room that provides entertainment to a small group of children when he has friends over, having a multi-controller games console would be good. Lets face it, having a group of friends huddled around one PC and a small monitor in the confines of a bedroom, whilst cosy, gets boring for those who are waiting to have a turn.

Other Requirements

All this needs to be established in such a way that it's power usage is economical, and such that it does not cost a lot - which might mean some seemingly crazy, yet innovative recycling/re-purposing of devices.

Initial Research - OS

One of the many questions to resolve here is which distro would be the most likely to achieve the greatest number of requirements - therefore providing a simpler low-risk solution and less set-up effort - and keep the focus upon conducting a successful project. Primarily I am considering one of two options - Debian 'Wheezy' and RaspBMC. Of these two offerings, RaspBMC is probably going to cover the need for the storage and streaming of digitised content. I am yet to find another distro for the Raspberry Pi that is know to be stable enough that would natively support a gaming interface such as Valve's Steam.

So, this is something that will need to be tested - is there a Raspberry Pi distro that can run steam? If not, this does not kill the project nor mean that we cannot meet the requirement. It just means that when we look for games to play, there will be a simple 'marketplace' to get them from.

Initial Research - Hardware

From the requirements that I've set, the solution is going to require the following hardware:

1. Raspberry Pi - I'd like to go with the latest, but I have an old Rev A Ver 2 that needs to be put to use.
2. Powered USB Hub - to power the Raspberry Pi and to provide device connectivity
3. Wireless keyboard/mouse replacement - For the moment, I'll have to start with just a USB mouse and keyboard.
4. USB HDD - at the moment I do have an HP 3TB unit sitting spare. I need to test it on the Pi as it is a little proprietary in its interface. It has it's own power supply which draws about 144W - so I am not entirely keen on this. A unit that is less power hungry or that could be powered through he USB hub would be nicer.
5. USB Wi-Fi dongle. I have a Netgear Wireless N dongle that's been spare for a while. It might well be too old to support the bandwidth for the media streaming.

Initial Research - Power Consumption

What are we replacing? A DVD/Video player, in which the DVD does not work (50W), a DVD player (15W), and a stereo system that I suspect runs about 45W - but given that CD's can play in the DVD player, it's consideration is negligible. There is also the as yet non-existent games console. So for now, that means that we are trying to keep power input to around the 65W mark (drawn by existing DVD and Video players combined). In terms of considering the project a success in this aspect, some consideration must also be given for replacing the need for a dedicated game console. Not currently owning one means that more detailed research of their specifications is required.

If all that is required to successfully implement this was the Raspberry Pi, a Wi-Fi dongle, and a wireless RF or Bluetooth dongle to connect to a wireless controller, that could be successfully achieved on just the power supply for the Raspberry Pi, which draws 36W.

I know from previous investigations that most powered USB hubs draw more than 60W, and the powered USB drive I have sitting handy draws 144W.

From doing some leg work and looking for the power consumption specs for game consoles online - well they sort of do not exist. That is to say, that in conducting searches it was easier to find power consumption statistics from independent sites, than from the manufacturer's themselves. Probably the most useful statistics I found compared the Wii U, the Xbox 360S, and the PS3 against one another (http://www.eurogamer.net/articles/digitalfoundry-wii-u-is-the-green-console). Definitely the Wii U runs at 30-35W by this reckoning, where as the older versions of the Xbox and PlayStation platforms were running at 65-75W. Not sure about the power drain of the Xbox One and the PS4 - the companies are all about bragging about the power usage when in stand-by or low power modes, but not about their power consumption whilst the device is actively being used.

So to keep this home-made solution green, I think that a reasonable target for success is 100W or less. At 130W or less, I think it could be considered on a par with the collection of devices that it replaces, but any result over 130W would be a fail.