[clug] Using an RPi3 to drive a scanner

Alex Ferrara alex at receptiveit.com.au
Mon Jun 3 16:13:56 UTC 2019

Hey Simon,

Your sums are good, and it *should* work.

Sometimes labels don’t reflect reality, and in that case a powered USB hub will save the day.

Alex Ferrara

> On 3 Jun 2019, at 10:50 pm, Simon Oxwell via linux <linux at lists.samba.org> 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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