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[Reply #15 on:]

I misspoke - I've got it connected to collector - and not the base.

I'll try see if I have a different ac wall wart in my junk pile

again thanks for your help

[Reply #16 on:]

If you disconnect the opto, and just put a simple push button in its place to pin 4, and open/close that bunch of times, do you still get the same lock up behavior?

[Reply #17 on:]

that works fine.

I can remove a 10vac leg and it works correctly
I can switch the 110 side of the transformer off via a strip surge protector and that works correctly
I can unplug/plug in/unplug etc the surge protector from the 110 source and that works correctly

It's only when I unplug/plug in/unplug the transformer from the 110 source that the arduino locks up

anyways - I found a 18vac doorbell transformer - and that doesn't lock up the arduino - so it's just has to be that other transformer - odd

[Reply #18 on:]

Yes, very odd indeed.

[Reply #19 on:]

thanks for your help

[Reply #20 on:]

Is it just me, or have all the files attached to posts disappeared?

It is a side-effect of being promoted to Moderator (congratulations, I think  ).  The suspicion is that the forum software has a bug or that an Administrator needs to make a configuration change.

[Reply #21 on:]

Thanks Coding

I have asked Massimo about the attachments disappearing.