In article , NY  wrote:

>Are there devices which delay the mains being turned on by a few seconds if
>I need the Pi to be turned on just before the hub?

Yes, whether they will work with low-draw devices like a Pi? I can't say.

There are power-saving mains switches/extension strips where you are
intended to plug the "computer" into the master port, and other
peripherals into the "peripheral" port(s). When the computer powers on,
the peripherals come on a couple of seconds later. When the computer
powers down, peripherals go off after a short delay.

The snag is, the one I have (free from eon/n-power?) continues to calibrate
itself based on current draw, not just a simple "0ma or something more" cutoff.

So when used with power tools (to activate an always-on vacuum cleaner
for auto-dust collection), it can sometimes get confused as the load goes
from zero, to "idling saw" (at which point it turns on), to "saw is cutting
wood for 10 seconds" then back to "idling saw": and switches off, because
the load dropped noticeably.

Of course, I don't want it to shut off while the saw is still running :)
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Mike Brown: mjb[-at-]signal11.org.uk  |    http://www.signal11.org.uk

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