Three timers trigger the Coolpix 8800 camera. The first when the bird interrupts the beam, the second every 3 seconds while it sits there,
and the third every 25 minutes to keep the camera from shutting down.
The 25 minute timer will not be needed for the Nikon D200 camera. The momentary voltage will be used to close a relay.
The 3 second interval can be much reduced.