Sorry but I read on the datasheet that the :

MOC 3041 (< 1 Euro or US $ by unity) had a "Zerocross detection"

That is the ones I used (I actualy never tested if it was synchonyzed !)

Hope this help

Jean-Yves

>----------
>De :   Holger Morgen[SMTP:hmo@Q8.DK]
>RŽpondre ˆ :       pic microcontroller discussion list
>Date : mardi 4 mai 1999 10:34
>A :    PICLIST@mitvma.mit.edu
>Objet :        Re: TRIACS FIRING
>
>Hi -
>
>Sorry but the MOC3023 and the rest of its family don't syncronise with the
>mains. They are "just"
>opto-triacs. (are ther others that do?)
>
>But you can proberly use them anyway: 
>
>a. Ignore the syncronisation (you won't "start/stop" that often)
>b. use an input on the pic conntet to the mains (thru another opto?)
>c. use a daming coil. (if space is no problem).
>
>I have not tryed any myself...
>
>/holger
>
>> ----------
>> From:         Seyler Jean-Yves[SMTP:Jean-Yves.Seyler@CNES.FR]
>> Sent:         Tuesday, May 04, 1999 9:57 AM
>> To:   PICLIST@MITVMA.MIT.EDU
>> Subject:      Re: TRIACS FIRING
>> 
>> Use a MOC xxx device.
>> I can't remember the exact reference : it is a opto-triac (DIL 6 pins)
>> synchronized with the main:
>> -> That makes a perfect isolation from the main and not much EMC since
>> it opens and close when the main go to 0 volt.
>> 
>> Hope this helps
>> 
>> Jean-Yves
>> 
>> >----------
>> >De :   WILLIE W. HO[SMTP:mtl@pub.zhongshan.gd.cn]
>> >RŽpondre ˆ :       WILLIE W. HO
>> >Date : mardi 4 mai 1999 06:13
>> >A :    PICLIST@mitvma.mit.edu
>> >Objet :        TRIACS FIRING
>> >
>> >Hello,
>> >
>> >I'm using 12C508 to control a heating device, anyone can tell me how to
>> >firing a triacs to control the heating device on/off.
>> >
>> >Best Rgds,
>> >
>> >Willie W. HO
>> >
>> 
>