On 29/11/2019 20:54, ss wrote:
On 29/11/2019 16:09, Rod Speed wrote:
I was going to investigate a(n invisible?) break-beam sort
of device that could be set higher than most ground
dwelling creatures

Thats sort of what I amÂ* trying to achieve using the PIR.
In the back yard a want to cover the area if someone gets close to my
patio or widows and at the front when someone comes down the path I get
a ding dong from the receiver in house. So narrow cover would be ideal.

At the moment I have tried blocking areas of the lense with strips of
insulating tape but I keep getting random soundings and I know nothing
is out there to set it off.

I have no electronic knowledge which is not helping.Â* There are more
expensive `systems` on the market but I dont want to invest if it aint
going to work.

Some years ago, I found that black insulation tape was transparent to
infra-red and so it will likely have no effect.

We had two Sky boxes that were piped around the house, but they had to
be physically in the same room. The boxes could not be set to different
codes (although the remotes could) and the solution was to blank off the
IR receiver of one and connect a translating "eye" to it's aerial
socket. The eye received the alternate code set from the second remote
and translated them to the ones the box could receive, but sent in via
the aerial socket.

To block the IR signal, I had to wrap the sensor inside the box, behind
a window, in aluminium foil, held on with tape, as tape alone had no effect.

SteveW