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???
01/21/07 13:37
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 		 #131185 - You can avoid the bridge
Responding to: ???'s previous message
Hello, five years ago I made a digital home controller for the lights of my home and I need to detect the zero crossing like you. At this time I used a transformer (220V - 6V) to isolate the main power and an AC optocoupler (H11AA1) directly to P3.2 of the AT89C52 (int0). I can´t remember if I used a 390 resistor between the transformer and the opto... Using this type of optocoupler you don´t need the diode brigde. excuse but I can´t respond before because I was on holidays. Hope this helps.

List of 31 messages in thread
TopicAuthorDate
Zero Crossing detector woes            01/01/70 00:00      
   "Bible" time.            01/01/70 00:00      
      proper connecton 4n35?            01/01/70 00:00      
   Try MOC 3041 or MOC 3043            01/01/70 00:00      
   links            01/01/70 00:00      
   Why make simple matters worse?            01/01/70 00:00      
      I would never do this!            01/01/70 00:00      
         Sounds like a recipe for a Darwin Award.            01/01/70 00:00      
            Total agree!            01/01/70 00:00      
         i had did this with opampe !            01/01/70 00:00      
   Have tried out the suggestions!            01/01/70 00:00      
      It will get you 'excited' when you reverse the plu            01/01/70 00:00      
   Schematic Added - Am I asking for too much?            01/01/70 00:00      
      Been there; done that            01/01/70 00:00      
      Jerson is right            01/01/70 00:00      
      Post the code !here!            01/01/70 00:00      
   URL for schematic            01/01/70 00:00      
      You can avoid the bridge            01/01/70 00:00      
      You need a pull up            01/01/70 00:00      
      Will not work!            01/01/70 00:00      
         will work - 4511 has active "high" outputs            01/01/70 00:00      
            what is a 4511            01/01/70 00:00      
               It's a CD4511, of course            01/01/70 00:00      
                  of course?            01/01/70 00:00      
            No, it will not            01/01/70 00:00      
               agree            01/01/70 00:00      
         Mistake in writing            01/01/70 00:00      
   just remembered this one . Do not know if            01/01/70 00:00      
   Am making modifications            01/01/70 00:00      
      a few answers            01/01/70 00:00      
   It is a HEF4511B - sorry for the short form.            01/01/70 00:00      

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