"Dave Liquorice" wrote in message
ll.net...
On Thu, 28 Aug 2008 20:24:44 +0100, Rick Hughes wrote:

It would be handy to be able to have a detector that can give an audible
signal when it starts to rain.

Plenty of kist available try Maplins. As you say the sensor is the biggest
problem. How about a few square inches of veroboard? Give it a rub over
with some fine sand paper to remove the protective lacquer and connect
alternate strips to each sensor wire. Copper will last for ages outside,

I don;t think it will, copper circuit board tracks which is what veroboard
is
tarnish very quickly within weeks. Most circuit boards are coated with a
protective layer to stop this oxidation process.