Article View: comp.robotics
Article #881Re: Cheap, light orientation sensor needed
From: Ryan K. Brooks
Date: Fri, 06 Nov 1992 23:57
Date: Fri, 06 Nov 1992 23:57
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2657 bytes
In article <1992Nov6.213500.6330@PacBell.COM>, tlhouns@ns.pacbell.com (Lee Hounshell) writes: >In article <1992Nov6.165554.16576@PacBell.COM> tlhouns@ns.pacbell.com (Lee Hounshell) writes: >> >>I had an idea for constructing one using "bend" sensors with weights attached >>to one end. As the robot's orientation would change, the sensors would move >>(because of gravity pulling the weights). If several of these sensors were >>placed strategically inside a robot's chassis, I suspect that one could calculate >>the robot's orientation fairly accurately. Any comments? > >To clarify my earlier posting: > >You would need to place 6 of these "bend" sensors in a small enclosed box, one >in the center of each "wall" of the box. This box would be contained within >the body of the robot. For an individual sensor, you wouldn't know exactly >which way the tilt occurred. But by looking at all 6 of the sensors together, >I think you could calculate orientation, as well as "invertedness." > > - the "bottom-most" sensor would always have the most "bend".. as it would > probably form a "U-like" shape. > > - the "top-most" sensor would usually have almost no bend, as it would hang > mostly straight down. This (along with the bottom sensor) let you determine > up/down orientation. > > - the "right/left/front/back" sensors would allow you to determine roll > and pitch. > > - You'd need an electronic compass mechanism of some sort to determine yaw. > Anyone know of one? > >Anyone know of a reason why this arrangement *wouldn't* work? >Are "bend" sensors flexible enough for this type of task? >Is there a way to easily attach them "perpendicular" to a wall? >And add a weight to the free end? > >-Lee What about using loose potentionmeters or shaft encoders with a hanging mass on the input shaft? just a thought.. ---------------------------- Ryan K. Brooks "You're never dead till you're 2575BrooksR@vms.csd.mu.edu out of quarters." Marquette University EECE NemeSys Corporation "Curtains for Windows"
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Path: arc1-ca.pugleaf.net!sparky!uunet!caen!spool.mu.edu!vms.csd.mu.edu!2575BROOKSR From: 2575brooksr@vms.csd.mu.edu (Ryan K. Brooks) Newsgroups: comp.robotics Subject: Re: Cheap, light orientation sensor needed Date: 6 Nov 1992 23:57:42 GMT Organization: Marquette University - Computer Services Lines: 47 Message-ID: <00963385.9CB0D560@vms.csd.mu.edu> References: <1992Nov6.171604.29238@kronos.arc.nasa.gov>,<1992Nov6.213500.6330@PacBell.COM> Reply-To: 2575brooksr@vms.csd.mu.edu NNTP-Posting-Host: vmsd.csd.mu.edu