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I assumed (from the video of Braben) that it was the other way around; it's powered by the HDMI connection to a TV. This makes kind of sense, since it's a USB h
by unwind 16y ago
I assumed (from the video of Braben) that it was the other way around; it's powered by the HDMI connection to a TV. This makes kind of sense, since it's a USB host. It allows you to connect stuff like keyboards and mice, which a USB device wouldn't do.
What's ... interesting about that reasoning is that according the Wikipedia, HDMI sources at most 50 mA at 5 V, which is 10% of what a USB root port is expected to deliver (500 mA).
Perhaps it will require a power supply, unless you can find a power-efficient keyboard. Shouldn't be impossible I guess, keyboards are fairly passive.
- dspillett 16y agoBut it also supports composite out - if you were connecting the display that way it would need power from somewhere else. Perhaps the connections seen at the top of it in http://www.raspberrypi.org/pcb.jpg http://www.raspberrypi.org/pcb.jpg are providing the power - it looks like they end up plugging into the USB hub (if that is the case then it must be a powered hub, but a passive hub could presumably be used if the board were getting power from elsewhere like a battery connected to those contacts). I've not watched the video yet (no speakers/headphones handy) so I could be missing something they show/say in there.
- unwind 16y agoTrue, for composite you'd need a different power supply. I agree that the wires in the picture look like they're coming off of the USB hub, and also that the hub looks like the powered variety. So, probably they'll go with at least one, preferably many, ways to power the machine externally. I hope they leave HDMI only as an option though, since it's incredibly neat. Oh, and I agree with others that they should look hard at integrating WiFi onboard.