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In message <6pru5l-oju1.ln1@q957.zbmc.eu>, Chris Green
writes
>Adrian wrote:
>> I'm looking for a USB controlled mains switch (230V AC) that I can
>> connect to a PI to turn a mains power supply on and off.
>>
>> I've done a bit of digging around on the net, and the options seem to
>> fall into two categories, either a relay device which means having to
>> rewire the device (which I'd rather avoid), priced around 30Euros or one
>> that sits in line (between the device and the supply). The latter
>> appears to be in excess of 100Euros, which is considerably more than I
>> want to pay.
>>
>I don't understand the difference. Surely anything that's going to
>turn something on/off needs to be "one that sits in line (between the
>device and the supply)" doesn't it?
>
The cheaper option involves cutting the plug off the item, and hard
wiring it into the board. I've got two problems with that. Firstly, it
means that I can't readily reuse that item elsewhere as I'd have to
replace the plug (a bit of a faff if it is temporary move), and secondly
if I'm trying to control something fed via a wall wart then it gets
messy unless I leave the wall wart powered all the time (which I'd
rather not do), and switch between it and the device.
>Do you mean (the ones that cost 100 Euros or more) something that
>already has a mains plug and socket on it? I think they're going to
>be expensive simply because they aren't much in demand. What 'the
>world' wants is a WiFi connected switch and they're two a penny of
>course.
>
Trust me to be awkward :-)
>
>> Any suggestions on where to look ? I'm not interested in a wireless
>> solution, as it is likely to be used in places where signals are not
>> reliable.
>>
>I think you'll probably have to bite the bullet and get a relay board
>of some sort. Does it **have** to be USB? There's lots of quite neat
>relay hats for the Pi.
>
No, but USB seemed to be the most likely solution as it works equally as
well for Non-Pi situations. Power may also be an issue. My initial
requirement is for a low power device, which (without checking the
numbers) might be within the capability of running directly from the Pi,
but I can foresee needs where that won't be the case, so a standard
solution has its attractions.
Thanks
Adrian
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