Subj : Re: USB controlled mains switch To : Adrian From : David Higton Date : Sun Jan 19 2025 17:35:32 In message 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. > > 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 did a bit of searching around. AliExpress sell various models of USB mains-rated relay boards. Various models offer 5V, 12V or 24V operation. I see from a later posting that your RPi is in an IP55 plastic box, so I'm jumping to the conclusion that you're happy with a bit of DIY to turn it from a board into a solution. If I were doing it this way, I think I'd go for a 12V powered board and have a separate PSU, rather than burden the RPi's supply further as many people have problems that are traceable to inadequate power supplies. It sounds like you may have to build a USB library for the relay boards - I don't know. If I were doing the overall job that you're doing, I wouldn't use USB, I'd use a GPIO pin to switch a different relay board on/off. Much easier (and I've done lots of work on USB firmware and drivers). David --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .