On 30 Aug, 18:37, (Andrew Gabriel) wrote:
In article ,
* * * * Owain writes:

Rick Hughes wrote:
Anybody anything better .... the key would seem to be the sensor ...
large enough surface are to catch first few drops ofrain, stable enough
not to corrode in a couple of weeks.

Veroboard with alternate strips commoned to each sensor wire?

That was the basis of one in Everyday Electronics which I made
well over 30 years ago. You need to heat it too (a few low power
resistors are sufficient), or it can takes ages to dry out and
stop reportingrain, when therainstopped ages beforehand,
and it might otherwise be triggered by condensation.

I think I've seen a simple module in Maplin which works much
the same way.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]


The only one I could find on MAPLIN was the Velleman MK108 kit ...
http://www.velleman.be/ot/en/product/view/?id=338493

The pdf manual (one page) makes this seem very basic, but has no
details of the sensor, maybe I'm being unfair and the sensor is
sophisticated and does it all .... the circuit seems so simple, that I
would assume buzzer sounds continuously until rain stops ... that is a
bit of a pain.