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David Brown
08/22/12 17:39
Read: 463 times
Klamath Falls Oregon
Usa!


 
#188127 - answers
Responding to: Jim Granville's previous message
The screen will either be ~8" or ~10". The initial one I had chosen ran on 3.3v. I had chosen 24v input to lower the input current, but I can easily drop down to 12v. I purposely stayed away from the screens with CFL backlights, as they take even more voltage to turn on.

But, the more I think about it and discuss it here, it would just be safer, easier, and cheaper to forget about the knob and do it in software on the screen. Then, with a capacitive touchscreen behind a clear cover molded into the enclosure, the only way for water to get into it would be if it physically broke open. Even then, with the low voltages and GFCI breakers on the input, it shouldn't be enough to harm anyone.



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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