OT? Humidty sensor for bathroom fans

[Simon Haslam <simon_haslam@xxxxxxxxxxx>]

OK, so this is sort of home automation in its loosest sense...

I'm installing a couple of extractor fans for adjacent bathrooms and would
=
like them to be humidity controlled. Vent Axia have humidity-stats either
b=
uilt into some fans (I'm not spending =A3200 inc VAT per fan though!) or
as=
a standalone sensor (=A3100!). So, thinks I, that can't be a very tricky c=
ircuit to build - sensor, op-amp, relay, bits and bobs...

Well, after what seems like an hour googling, the best I've come up with
is=
an out of stock Conrad kit:
http://www.conrad-uk.com/ce/en/product/197360/Humidity-sensor-relay-kit
I'll send Conrad an email and see if they're likely to come back in stock
(=
though I suspect it may depend on when there's enough demand for the next
b=
atch of PCBs to be made), but has anyone else found/done something similar?

Simon

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