[mythtvnz] [OT] Home Automation

[Steve Hodge]

On Tue, Aug 20, 2013 at 1:41 PM, yuri <yuridg at gmail.com> wrote:

> On 20 August 2013 11:24, Steve Hodge wrote:
> > Nick wanted dimming, but Yuri was just after relay control. He didn't
> say if
> > he was looking to switch mains power or not, but that would be the most
> > common case I'd guess.
>
> I would never hook up a computer-controlled relay board directly to
> mains, even if it was rated for it.
> I would have contactors with ELV (12V or 24V) coils rated for mains
> switching.
>

You can get computer controlled relay boards with separate coil voltage
supplies (and with the coils optoisolated from the computer). In fact
that's probably the typical scenario for 3.3V microprocessors like the
Raspberry Pi. Obviously you must ensure your solution is appropriate to
your requirements and the requirements for switching a couple of hundred
watts of lights is significantly different from switching a 2kW heater.

Cheers,
Steve
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