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Polar Map - Ping device — Parallax Forums

Polar Map - Ping device

ALIBEALIBE Posts: 299
edited 2006-09-18 17:14 in Propeller 1
I am looking to getting some guidance with drawing a polar map of the data gathered by the Ping device. Has anyone done work on this or can provide some pointers or guidance please.

thanks in advance

Nagi

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ALIBE - Artificial LIfe BEing. In search of building autonoumous land robot

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Comments

  • acantostegaacantostega Posts: 105
    edited 2006-09-17 04:53
    Maybe you could be more specific. What are you trying to do? Are you physically rotating the Ping (or maybe have many Pings arranged opointing in different directions, radially outwards) and measuring distance for different angles (which of course is naturally represented as a polar graph)? Or are you testing the measurement cone of the device? (There are already some of those on Parallax's docs).
  • ALIBEALIBE Posts: 299
    edited 2006-09-17 14:32
    I have 4 separate Pings strategically and statically placed on my robot (front, left, right, and one in the rear). Upon takign the readings from a PING (suppose the front facing), I would like to determine, which objects (or hurdles) are in its range.

    I am suspecting that I may have to move or wiggle the Ping ever so slightly to get such data.

    Once I have this data, I can make navigation decisions toward the farthest object (or hurdle) yet keeping at the heading point.

    I hope I have described what I am looking for

    thanks

    Nagi

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    ALIBE - Artificial LIfe BEing. In search of building autonoumous land robot

    http://fstop.crosscity.com/
    http://icar.crosscity.com/
    ·
  • acantostegaacantostega Posts: 105
    edited 2006-09-18 04:07
    Oh, I see. Well, there are various possible approaches to navisgating with sonars. But first you have to consider sonars aren't Laser range sensors. They have a relatively wide "cone" of detection so they're best for short range object avoidance. Beware that roboticists that use a "polar map" approach with their sonars are usually using 24 sonar sensors or more -- in you're case a polar map would be rather impoverished since there'd be only 4 possible angles.
    Here's a useful article: www.seattlerobotics.org/encoder/may97/sonar2.html
  • acantostegaacantostega Posts: 105
    edited 2006-09-18 04:11
    By the way, look around in the Encoder, there's ton of useful stuff.
  • ALIBEALIBE Posts: 299
    edited 2006-09-18 17:14
    thanks, I will check that out.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ALIBE - Artificial LIfe BEing. In search of building autonoumous land robot

    http://fstop.crosscity.com/
    http://icar.crosscity.com/
    ·
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