Subject:
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Re: Bumper Ideas Needed
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Dec 1998 22:34:23 GMT
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Original-From:
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Cynthia E. Tsao <cyndtsao@pacbell.NOSPAMnet>
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Viewed:
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1229 times
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I think the limitation is thinking in only two dimensions.
For a 360 sensor (albeit one that cannot tell which direction hit it), I
can concieve of a ring bumper suspended in the center over the robot.
The attachment is via a universal joint like apparatus. When the bumper
collides with an object, it shifts off center, and takes pressure OFF of
a vertically mounted touch sensor. Hard to describe, my ascii drawing
as follows will probably suck but here goes:
Side View:
_______
/ + \ + is the 360 pivot, weight of the
/ S \ bumper structure keeps it centered on
/ RCX \ Sensor S, when one of the bumpers ( or )
( O O ) is hit, it pushes the + off center and
off of S, signal goes from 1 -> 0
NB: O represents wheels, RCX is robot
Imagine a "Hat" like affair covering/surrounding the robot that is
balanced at a point under the top/inside of the hat. I think that'll
work, but it'll be slightly cumbersome.
I have another idea for a omnidirectional IR Transmitter/Reciever
arrangement. Create a robot chassis with the RCX oriented such that the
IR Port is pointing straight up. Then construct a cone shaped reflector
to perch above the port with the point down (Probably use tin foil, I
know, this is cheating!). Now, the IR signal 360. See below:
Side View: \ / <- this is the reflector, signals get bounced
\/ down into the port coming in
^----- signals going up get bounced out sideways
IR
port
What do you think? This way, several RCX units can communicate
regardless of rotational orientation on the XY plane.
Regards,
Dave Chen
dcchen@pacbell.net
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Message is in Reply To:
 | | Bumper Ideas Needed
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| Hi I've been the working in making a flexible bumper using only one switch for my CyberMaster and after constructing about 4 or 5 prototypes I've found out that after all I don't know how to make a decent flexible-and-with-lo...-of-travel bumper. I (...) (26 years ago, 4-Dec-98, to lugnet.robotics)
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