More than one slave?

[DaleJP]

I hope you are well.

I have returned to this setup after leaving it on hold for a while. I have two units at opposite sides of our preschool and have another spare that I would like to add as "SeismoS2", is this possible?

I'd also like to know if you have found that it is reliable or if there are any problems with the system. I've noticed that you haven't updated it in a while, is that because it is stable? or have you moved on to other things?

Thanks a lot for your work on this. With the recent earthquake here in Japan, we are looking again at safety, and this will be very useful as a confirmation and extra failback system for turning off certain things in an earthquake.