On Apr 28, 3:08 pm, root wrote:

Just to be clear: this is intended ONLY for indoor use?

It'll be outdoor. Suitably weatherproofed of course.

I'd consider an acoustic detector. Either an electret microphone or
a piezo insert. Have that attached to the thing the nuts will fall
onto and detect the noise they make

I did consider something at the delivery end but was concerned about
(un)intentional interference from the birds, particularly if they
start pecking at the dish in anticipation of the nuts as this might
scupper both weight and acoustic detection.

Mathew