Subject:
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Robot Positioning using Beacons
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 1 May 2002 05:34:26 GMT
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Viewed:
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7400 times
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I am beginning to design a handyboard robot that, for starters, can navigate
around a room. The idea is that it will travel to objects whose coordinates
within the room are predetermined and interact with them.
I plan to do this by triangulating the robots position within the room. I
would like to build three simple IR beacons consisting of a simple IR
emitting LED that can be adjusted to pulse at different rates. These would
be mounted in opposite corners of the room and each will be assigned a
different pulse rate. The robot will have three IR receivers to detect the
beacons. Each IR receiver will have it's own Sonic Rangefinder to find the
distance to the beacon. This would give the robot x, y, z coordinates in
the room. Any room with dimensions that exceed the maximum range to the
range finders or IR receivers will have multiple beacons, but the robot will
always have three "sensor arrays." The unique pulse rates for each beacon
will identify them, and there will be databases of coordinate systems for
each possible combination of beacons being used (always the three closest).
Each sensor array will rotate on a stationary point on the robot to locate
the beacons.
I have a few questions:
1. First, are there any flaws in my idea?
2. What is the cheapest and simplest way to build the IR beacons so
that I can assign them different pulse rates?
3. Will the sensor arrays also need to angle up and down as the robot
moves closer and further from the beacons, or can the beacons remain in
their field of vision while they stay stationary?
4. What would be the best IR transmitters, IR receivers, and sonic
rangefinders for the job?
I appreciate any help anyone can give. I'm new to robotics and my education
has not yet caught up with my ambitions.
Thanks,
Chris Steiger
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Message has 1 Reply:
 | | Re: Robot Positioning using Beacons
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| The problem with IR is that it tends to get everywhere, reflecting off of surfaces etc, so it's hard to triangulate. May I suggest a related but different approach. Make your beacons out of hybrid IR/sonar transmitters. The beacons will periodically (...) (23 years ago, 1-May-02, to lugnet.robotics.handyboard)
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