Hello All,

I am currently working on a IR Remote controlled light dimmer based on a
16c84. Right now I can switch the light completely on or off using the
remote control (switching is done with a triac). The next step is to make the
dimmer circuit so that the light intensity can be adjusted using + and - keys
on the remote control. The plan is to let the PIC trigger the triac after an
AC zero crossing. The time between the AC zero crossing and the triggering
determines the light intensity. This is just like a standard triac based
light dimmer. The problem is that I am fairly new to electronics and don't
know how to sync the PIC to the AC frequency. Or in other words : Let the
PIC know that an AC zero crossing occured. Maybe you guru's can help me.
Perhaps (very likely) there is a simpler sollution to the problem. I would
like to know your idea's

Thanks in advance,

Michel Polder