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- Path: 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
-
- 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."
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