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- Newsgroups: comp.robotics
- Path: sparky!uunet!utcsri!helios.physics.utoronto.ca!alchemy.chem.utoronto.ca!pdavies
- From: pdavies@alchemy.chem.utoronto.ca (Paul Davies)
- Subject: Re: Seeking high-resolution ultrasound system
- Message-ID: <1992Nov10.230411.11815@alchemy.chem.utoronto.ca>
- Organization: University of Toronto Chemistry Department
- References: <92315.0022523034871@QUCDN.QueensU.CA> <1992Nov10.192123.14608@meaddata.com>
- Date: Tue, 10 Nov 1992 23:04:11 GMT
- Lines: 29
-
- >3034871@QUCDN.QueensU.CA (Ralph Siemsen) writes:
- >: We're looking for some ultrasonic (or otherwise) detector to measure
- >: distances of 5-15 cm to an accuracy of +- 0.5cm or better.
- >:
- >: The intended application is to measure the angle (by triangulation)
- >: of a monopod robot relative to the ground. We have considered
- >: accelerometers, but the bouncing action of the robot makes them
- >: innefective. Commercial angle sensors are expensive ($1500) and we
- >: really only care about a small range of angles (20 degrees), rather
- >: than the full 180 degrees that most commercial units offer.
- >:
- >: So it would be quite easy to measure the distance to the ground from
- >: a platform atop the robot. All we need is a nice sensor.
-
- I remember in undergrad some guys built a broom handle balancing robot.
- It only had 1 degree of freedom. They used a pot and calculated the
- angle from that. Since it was analog it was very fast. It worked
- pretty good except the tires slipped on the floor (i think they later
- tried to use a chain and gear wheels).
-
-
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- | "The effects of technology do not occur
- Paul Davies / Synthetic Man | at the level of opinions or concepts, but
- pdavies@alchemy.chem.utoronto.ca | alter sense ratios or patterns of per-
- rec.arts.bodyart FAQ Keeper | ception steadily and without resistance."
- | - Marshall McLuhan
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