I am wanting to detect motion out to about 100 yards. Is there any sensor that will allow for this to be done?
Out that far you may have to resort to imaging sensors and use change detection algorithms to detect motion. Just about anything with images is beyond the capabilities of the 8-bit Arduinos but should work fine on the DUE once all libraries and some more get ported for that processor. At night with no limited illumination you would probably have to rely on IR imagers, think a lot of money.
ok, thanks for the info
I do not know what your application is but if it is for something like home security you could save some cash by placing a smaller ranged sensor at the 100 yard mark, plug it into an Arduino, and use an XBee to talk with an Arduino in your home.
Just an Idea,
Drew Davis