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???
10/22/09 07:58
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 		 #169956 - Clarify
Responding to: ???'s previous message
Muhammad Naeem said:
we are driving external interrupt from proximity switch.

What proximity switch?
Are you sure that the interface is correct in accordance with its specifications?

This circuit was running two month. But previous two days I am facing problem. Problem is that when a metal comes to near to proximity switch

Are you saying that you've been doing exactly this for 2 months, and it's "suddenly" stopped working?

Or is there something new/different about this particular "metal" that you haven't used before?

etc?

Only one time interrupt line goes low.

Surely, the "interrupt line" is driven by the "proximity switch" - so its behaviour has nothing to do with the 89C51?

What does the Datasheet for your "proximity switch" say?
If it's not behaving according to its specifications, then you should contact the manufacturer and/or supplier;
If you're using it outside of its specifications (eg, is isn't intended for use with metal objects), then that'll be the problem!


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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