Mr Fixit wrote:
"Dave Plowman (News)" wrote in message
...

In article ,
M.Joshi wrote:

If I build the circuitry into a separate box next to the light switch,
is there an easy way to sense when the switch is on/off?

In the UK lighting switches are usually single pole, so if that's also the
case in the US change to a double pole one and use one pole for the
sounder.


US light switches are electrically identical to UK switches, single
pole. The exception being the "4 way" switch which is placed between two
SPDT "3-way" switches in the rare occasion that a light needs to be
controlled from more than two locations.