Interrupts question

[mister_e]

Good point and tips there. I thought about the dual winding for my application but I needed it really small to fit in an existing installation (kind of reverse engineering job), none of the dual secondary winding tranformer I found locally were small enough, the transformerless solution was REALLY not an option and everything was for...yesterday (yeah it happen ) ... so in the end I added a TLP2098 (if my memory serves me well) i had in stock, problem solved.

If I had a toroidal one on hand, I would have try to wind a seconday on the top for testing purpose, maybe it would have work... or really not hahaha.

[Charles Linquis]

I couldn't use an opto for my particular application because I needed to know the peak voltages of the AC waveform, cycle-by-cycle.

[alec]

Hi All, and apologies for not getting back to you all sooner (damned work!!)
I hate to admit this, but a wire had gotten disconnected on my bread board - amazing how much better a PIC works when it has a five volt supply...
My zero crossing detector works great, and I'm getting a nice clean pulse train to my triac optocoupler. Now to go back to the code to make my kitchen heater controller - I'm making a sous vide controller for a crockpot..
Thanks again for all the help - before I tear hair out again I'll make sure to check my hardware first...
Alec

[alec]

BTW - I'm using a PS205-1 AC input photocoupler. Works great with a 10k 1 watt resistor in the input.
Alec