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Jim Granville
08/22/12 16:20
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#188125 - Go to the lowest practical voltage
Responding to: David Brown's previous message
David Brown said:
... use while they are standing in a swimming pool.
... The unit will likely run on 24vDC, and the highest voltage internally would be for the displays' LED backlight, at ~30vDC.


How large is this display ?

Pure water may be non conductive, but pools are nowhere near pure.
Standing in a pool is a LOT of wetted area, and the person may have medical conditions, so you need to avoid current paths.
* Lower the voltage to the lowest practical - 3.3V or 5V displays are easily available

Also avoid any moving seal, do you _really_ need a Pot, with a touch panel right next to it ?

I know Spa pool suppliers make wide use of Air switches, driven by safety and reliability concerns.


List of 22 messages in thread
TopicAuthorDate
Designing a product for use in water      David Brown      08/21/12 17:39      
   Have you considered silicone coating?      Richard Erlacher      08/21/12 21:11      
   one link      Stefan KAnev      08/21/12 22:04      
   Waterproof enclosures      Oliver Sedlacek      08/22/12 02:12      
      Projective touch - or maybe waterproof tablet      Per Westermark      08/22/12 06:27      
         If that potentiometer wasn't a hard requirement      Erik Malund      08/22/12 08:00      
            more details      David Brown      08/22/12 10:54      
               You might want to look into that a bit further      Richard Erlacher      08/22/12 13:33      
                  buttons for up/down gives tactile feedback      Per Westermark      08/22/12 14:12      
                     nevertheless, a strobe wheel rather than a pot ...      Richard Erlacher      08/22/12 15:24      
                        more good ideas      David Brown      08/22/12 16:42      
   Go to the lowest practical voltage      Jim Granville      08/22/12 16:20      
      answers      David Brown      08/22/12 17:39      
         Electric shock and intrinsically safe      Oliver Sedlacek      08/23/12 02:11      
            Isolators      David Brown      08/23/12 19:13      
               a question and a reference      Erik Malund      08/24/12 07:05      
                  answers      David Brown      08/24/12 10:55      
                     tethered unit??      Erik Malund      08/24/12 12:12      
                        mounted display      David Brown      08/24/12 12:32      
                           have you considered a combination of battery and solar?      Richard Erlacher      08/24/12 14:56      
                              indoor pool      David Brown      08/27/12 10:24      
                           Wireless chargers      Oliver Sedlacek      08/27/12 15:30      

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