[clug] Using an RPi3 to drive a scanner

[George at Clug]

Simon,


I was once wanting to run a USB DVD drive from a Table PC, I was going
to purchase a powered USB hub, so the hub powered the USB drive and
not the Table PC, however I used a USB memory drive instead of the DVD
drive, so I never tested the idea in the real world.


George.



On Monday, 03-06-2019 at 22:50 Simon Oxwell via linux wrote:


So,

I've got this scanner. It's USB powered, and the docs say it's max
power
draw is 5W (which I'm assuming is 1A @ 5V)

I'm looking to drive that with something tiny runnig SANE that I can
bolt
under the desk (I was a full-on Linux server, but it died and
requirements
have changed) so was looking at a Raspberry Pi 3. I've seen in a
couple of
places  that the USB line can provide 1.2A which is shared across
the 4 USB
ports. [1]

Also based of [1] looks like I'd also need a 2.5A power supply to make
the
whole thing work.

So, have a I got my sums right and more importantly, has anyone here
tried
it in practice?

Simon



[1] https://github.com/superjamie/lazyweb/wiki/Raspberry-Pi-Power
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