Hi. i'm in the process making a monitoring 240 ac voltage system using arduino. the examples that i working on based on this website: http://openenergymonitor.org/emon/node/58
one thing that i notice is that, they using an AC to AC adapter. so my question is:
1. how to get the ac/ac adapter?? i try to google it, but zero find.
2. is there any chance that any other ways to measure 240 ac voltage?
thanks in advance.