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[DPRG] Absolute reference for angular position
Subject: [DPRG] Absolute reference for angular position
From: Chris Jang
christopher.jang at yahoo.com
Date: Tue May 27 12:14:47 CDT 2008
> > Can anyone suggest an alternate method for measuring angular position with
> a
> > high degree of accuracy and repeatability? All I really need is an "index
> > mark" to tell me when the robot returns to a specific heading and not a
> > continuous readout of angular position.
>
> If you're only going to be using this to calibrate your rotation, you
> could use a beacon and a directional receiver; a 38kHz IR receiver
> module might work for this, if you restricted its field of view. You
> could do something similar with a laser pointer and a photodetector;
> whenever the laser is directly falling on the detector, its value will
> go up sharply.
Another possibility is to take photographs of the robot as it rotates.
Lay out some tape or other visual markers to establish a frame of
reference. Then if there is a DRO of the angular position in view of the
camera (maybe a laptop showing the angular readout - use a serial cable
from the robot to take readings), there are no issues synchronizing data
collection with the photos. One problem might be refresh of the DRO - may
not look right to the camera.
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