Jim K wrote
Rod Speed wrote
Jim K wrote

getting Pd off with motion detecing IP cams sending 100s of emails of
moving bushes and sunshine/shade changes.

One of the IP cams has 2 channels for I/O - so I'm pondering how to
send a signal to it to take a snap when something goes across the cam;s
field of view.

PIR would be perfect but a very narrow "beam" is required to make sure I
get the subject in the centre of the frame... and the IP cam is not
going to be happy with 240v up its I/O - so ???

low voltage PIR? what from where?

a normal 240v PIR and some sort of a relay?

something else?

Yeah, decent software that allows you to specify a subset of the
camera view to monitor for movement and is smart enough to
not be triggered by sunshine/shade changes due to small clouds
passing the sun etc.

mmm unlikely as the IP cams are firmware based, run on cut down unix tghus
unable to upload "better software" to....

I meant run that on whatever you record the output to, not on them
themselves.

Much more elegant than farting around with a separate PIR with sticky tape
on it.