Hi all,
Now theres a thought! I have not checked that particular gotcha and cannot
wait to get home tonight to test it out. Thank a million!! I will let you
know how I went.

                                                John

                -----Original Message-----
                From:   Terry [mailto:t3design@PACIFIC.NET.SG]
                Sent:   Saturday, 11 March 2000 2:26
                To:     PICLIST@MITVMA.MIT.EDU
                Subject:        Re: Gotcha not
                Importance:     High

                Are you using a PCB under the dome? Either enclose the PCB
in a water tight
                enclosure with a small packet of desiccant prior to sealing
it up or use a
                good conformal coating sprayed top and bottom of the board.
Clear domes are
                great for distilling pure water by condensing water vapor.
Make sure the
                LDR and it's circuit is coated with the conformal coating
too. You can tape
                a small piece of masking tape on the lens of the LDR and
peel it off before
                the coating fully dries.

                Cheers
                Terry



                At 01:18 PM 3/10/00 +1100, you wrote:
                >Hi all,
                >Many thanks for the varied and wonderful answers. I am
driving the relay
                >transistor (2N222A) through a 1K resistor from the PIC and
the relay has
                >reverse BEMF protection.