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???
10/22/09 08:08
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 		 #169957 - Noise? Analog processing?
Responding to: ???'s previous message
The external electronics will affect what signal the interrupt input sees.

If you have an edge-trigged interrupt and the sensor can get into a state where the signal rings, you can get multiple pulses. Are the signal digital or analog? If analog,then you may need a schmitt-trigger to make sure that the interrupt input does not float in the middle - that the sensor will report a distinct high or low.

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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