John,
I have that app and it has a resolution of 0.1 degrees.
The one at your URL says
"The display always reads left to right, even if inverted, and a "hold"
button keeps the measurement for reference. It has a range of 90° left or
right and a resolution of 0.05° (accurate to 0.2°)."
That digital protractor had a resolution of 0.05 degrees.
So it does seem there is more than one technology being used here.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com
[mailto:gingery_machines@yahoogroups.com] On Behalf Of tjwal
Sent: Tuesday, September 06, 2011 8:02 AM
To: gingery_machines@yahoogroups.com
Subject: [gingery_machines] Re: new article: A Low Cost "Digital" Angle Gage
Rick
I should have read throught the entire thread as I was thinking about one of
these
http://www.leevalley.com/en/wood/page.aspx?p=67350&cat=1,43513
Typical resolution for these types of sensors is about 0.05 degrees. This
isn't the same as accuracy but if you are using them to measure the
difference between two angles they are very accurate.
iphones and ipads have these sensors built in. I have an inclinometer app
for the ipad (free). I don't have it with me so I can't say what the
resolution is. Everyone needs a $500 angle sensor in their shop LOL.
I believe Ron is correct that the protractors use a rotory encoder
implemented in the way you have described it.
JohnW
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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