paimpozhil:
Hi MarkT,Staircases are CFL lights and yeah they are totally independent of the florescent
There are 6 of them and I have wired all of them to relay board which has 8 relays and an ULN2003.
I have ensured the digital wires and AC mains wire are separated out by few inches.
A few inches isn't great - route them completely away from each other. sheided cable is good,
ferrite toroids can be good to reject common-mode transients. You may also have a ground loop
which you need to think about - bring the mains to the relay board and Arduino PSU in one place
to avoid such a loop.