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.

Plastic tape is no use. Try foil tape that will stop thermal IR.

A small cone of foil small end facing outwards will allow you to limit
the sensitive field of view, but limit it too much and the differential
motion detection will probably fail.

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.


--
Regards,
Martin Brown