Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
09/20/06 17:30
Read: times


 		 #124700 - ZERO CROSS DETECTOR....
Responding to: ???'s previous message
If you do not have any option other then using old 8051 derivative in which external interrupt signal is low going edge the you can try the two configurations given below for each case one is for falling edge detection and other for rising edge detection..hope this will be useful to you.


Save This Code

   SIGNAL IN          + |\
 O------/\/\/\/\/\------| \       R2
         R1             |  \____/\/\/\/\________to int0 pin
                      - |  /
               >>>------| / 
           Vref in      |/
             1 volt

*Vref = stable 1 volt refrence source.

*USE ABOVE CIRCUIT FOR GETTING INTERRUPTS ON FALLING EDGE OF INPUT SIGNAL

Save This Code
  SIGNAL IN             -  |\
 O------/\/\/\/\/\---------| \       R2
         R1                |  \____/\/\/\/\________to int0 pin
                         + |  /
               >>>---------| / 
           Vref in         |/
             1 volt


*Vref = stable 1 volt refrence source.
*USE ABOVE CIRCUIT FOR GETTING INTERRUPTS ON RISING EDGE OF INPUT SIGNAL


This is all what i can provide at the moment as presently i am sitting on a system which do not have any schematic drawing software installed

Use any comparator like LM358 etc for above.

****IMPORTANT>>>PLEASE OBSERVE THE SIGNS OF INPUT TERMINALS OF COMPARATORS.

Regards
SAIF ULLAH KHALID
INDIA

List of 31 messages in thread
TopicAuthorDate
Interupt question......            01/01/70 00:00      
   quick answer..            01/01/70 00:00      
   Noise            01/01/70 00:00      
   Perplexed......            01/01/70 00:00      
   Interrupt            01/01/70 00:00      
      does not matter            01/01/70 00:00      
         Attack            01/01/70 00:00      
            You did ask for it            01/01/70 00:00      
         Interruptifobia            01/01/70 00:00      
            There's not always a performance penalty            01/01/70 00:00      
               there is always an exception            01/01/70 00:00      
                  the controller task            01/01/70 00:00      
   very busy processor......            01/01/70 00:00      
      most likely it is not            01/01/70 00:00      
         PLC ?            01/01/70 00:00      
            since forever            01/01/70 00:00      
   Definatly a PLC....            01/01/70 00:00      
      a link            01/01/70 00:00      
      The application may be a PLC, but the chip is not            01/01/70 00:00      
         I do not think that is what David does            01/01/70 00:00      
   code......            01/01/70 00:00      
   Sorry......            01/01/70 00:00      
      Just post            01/01/70 00:00      
         code post.....            01/01/70 00:00      
            Posting Code and Idea            01/01/70 00:00      
            Where are ....            01/01/70 00:00      
   Ok back on this interupt routine            01/01/70 00:00      
      put an inverter on the pin            01/01/70 00:00      
   ZERO CROSS DETECTOR....            01/01/70 00:00      
      Saif, please and a note            01/01/70 00:00      
         actually...            01/01/70 00:00      

Back to Subject List