On 28/05/2012 20:00, 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?

Illuminator, reflector, and a photocell break beam detector?

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/