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   RBERRYPI      Support for the Raspberry Pi device      21,939 messages   

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   Message 21,207 of 21,939   
   Chris Elvidge to R.Wieser   
   Re: USB controlled mains switch   
   19 Jan 25 22:06:38   
   
   INTL 3:770/1 3:770/3   
   REPLYADDR chris@internal.net   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  51ddd596   
   REPLY:  951731f0   
   PID: SoupGate-Win32 v1.05   
   On 19/01/2025 at 19:24, R.Wieser wrote:   
   > Adrian,   
   >   
   >> ... 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)   
   >   
   > Whut ?   As others have already mentioned, you could take a short extension   
   > cord and put the relais* in that cord.  Makes it reusable too.   
   >   
   > * also consider a solid-state relais.   
   >   
   > Also, you say USB controlled.  How do you imagine that ?  As some kind of   
   > special USB device (for which it is hard to find a driver) ?   
      
   As I have said previously, it's easy. E.g.   
   https://www.amazon.co.uk/Control-Intelligent-Channel-Controller-   
   upport-default/dp/B07PWPF2DT   
   Load 'usbrelay' to control (apt-get install usbrelay')   
      
   >   
   > Perhaps consider a simple USB-to-serial thingly*, where you can use the DTR   
   > line to signal the relais board to switch on.  After that you can use the   
   > RPi build-in serial API to switch the relais.   
   >   
   > * I would strongly suggest to use one of RPi's gazillion I/O pins for it,   
   > but as you specifically mentioned USB controlled ...   
   >   
   > The only thing you will need to do (and which costs money) is to put the   
   > relais (and the USB-to-signal-line thingamagochy ?) in a shielding plastic   
   > box.  220 is lethal even when you touch it by accident. :-)   And make sure   
   > the 220v and the relais-driving low-voltage electronics are well seperated.   
   > Your RPi doesn't like 220v either. :-o   
   >   
   > Regards,   
   > Rudy Wieser   
   >   
   >   
      
      
      
   --   
   Chris Elvidge, England   
   I CANNOT ABSOLVE SINS   
      
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