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???
10/22/09 09:05
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 		 #169965 - Not necessarily true
Responding to: ???'s previous message
Ghulam Mustafa said:
because when your circuit working correctly for 2months long it means that the programming was allright.

For a start, we don't know that the OP hasn't just started doing something new - which might never have worked!

Even if nothing has deliberately changed, it doesn't necessarily mean that everything was "all right" - there could have been some latent bug; it could have been marginal, and has now just drifted across the border from "working" to "not", etc, etc,...

As has been said very many times before, there is a very big difference between just not observing any problems and thoroughly testing your systems to ensure that it works under all conditions - including extremes and error cases.

List of 25 messages in thread
TopicAuthorDate
External interrupt problem.            01/01/70 00:00      
   Clarify            01/01/70 00:00      
      Noise? Analog processing?            01/01/70 00:00      
      Inductive proximity switch            01/01/70 00:00      
         Looked at the signal?            01/01/70 00:00      
            air humidity and external interrupt pin            01/01/70 00:00      
               No, the interrupt line isn't affected by air humidity            01/01/70 00:00      
                  air humidity can affect - also temperature, etc            01/01/70 00:00      
   May be the proximity switch not working properly            01/01/70 00:00      
      Indication is not proof            01/01/70 00:00      
      using new proximity switch            01/01/70 00:00      
         Are you using it correctly?            01/01/70 00:00      
            i am using proximity switch correctly            01/01/70 00:00      
      Not necessarily true            01/01/70 00:00      
   The first obvious sign of failure            01/01/70 00:00      
      Try this            01/01/70 00:00      
         by my best guess ....            01/01/70 00:00      
   Some ideas            01/01/70 00:00      
      Inductive Proximity Sensors            01/01/70 00:00      
   Who mentioned "inductive"?            01/01/70 00:00      
      Fourth one down            01/01/70 00:00      
         Oh yes!            01/01/70 00:00      
   Can you post the schematic ?            01/01/70 00:00      
   Problem solved            01/01/70 00:00      
      Thus proving the point...            01/01/70 00:00      

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