[clug] Using an RPi3 to drive a scanner

rodney peters rodneyp at iinet.net.au
Mon Jun 3 22:18:07 UTC 2019

On 3/6/19 10:50 pm, 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

Your other option would be to obtain a USB 2 "Y" cable and power the 
scanner from a separate USB power supply.  I do similar occasionally for 
a USB DVD drive.


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