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   In article ,   
   The Natural Philosopher   wrote:   
   >BUT although it would be a fun project, even getting hold of big solid   
   >state relays is difficult.   
      
   They're pretty readily available through (for instance) Amazon:   
      
   https://amzn.to/449j7O0   
      
   Make sure you get one that uses DC input to switch an AC output.  I have one   
   switching the 600W bed heater in a 3D printer.  It's controlled by the 12V   
   bed-heater output on the printer motherboard, but this one should be   
   directly controllable by a Raspberry Pi GPIO pin.  If that proves to not   
   quite be the case, a transistor and resistor would let you switch the SSR   
   with 5V instead of 3.3V.   
      
   --   
     _/_   
    / v \ Scott Alfter (remove the obvious to send mail)   
   (IIGS( https://alfter.us/         Top-posting!   
    \_^_/                            >What's the most annoying thing on Usenet?   
      
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