I'm looking for a laser "rangefinder" for close-range scanning of mechanical key profiles; I was hoping for +-.1mm accuracy with a range of 5-25 mm.
Is anyone aware of a cheaper piece of hardware than Parallax's? I spent a few hours over the problem with Google, so I know that there are better ones out there, but they're all well outside of my [tightwad].
cheers.
Why not IR?
0.1 mm accuracy means expensive laser as far as I know ...
e.g. - http://www.metrologyresource.com/glossary.php -
but this one might be just within your requirements
image from polulu
in the range of 5-25 mm you could use an AREF of 2.5Volt to have a 0..1023 range on 2.5 volt.
Given 2 bits of noise that would mean 256 distinct values on 2.5 volt ==> 0.01 volt
Thanks.
I think that I'll give this one a try. I hadn't seen it, only saw the sharp ir "detectors" that are either open or closed.
More update when I've finished.
Cheers.