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Posted by pogo on September 23, 2007, 8:55 pm
Please log in for more thread options > pogo wrote:
>>
>> Hello everyone.
>> Has anyone successfully used an electronic compass on a robot inside a
>> house
>> to help with localization? I was thinking that if a bot knew it was
>> facing a
>> certain direction then it would only have to search an internal map for
>> landmarks known to be in that direction.
>>
>> The kind of compass I am talking about is something like the Hitachi
>> HM55B
>> Compass Module sold by Parallax.
>
> I've experimented, but nothing definitive. What I found is that you have
> to integrate the compass reading with other sensors. It's also a good
> idea to keep a historical log of readings (last 30 seconds or so), and
> compare those against known changes in heading. This can be accomplished
> with basic wheel odometry, for example. That way, if your bot goes by a
> table with metal legs you can just toss the readings as anomalistic.
>
> Even for humans, a landmark is the best way to reorient yourself. You're
> back to beacons, scanning the patterns in the ceiling to map the room
> whereabouts, and what-not.
>
> -- Gordon
Yep - this is and other answers are kinda what I expected. Guess I will have
to label my robots "for use in wigwams only" ...
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> Has anyone successfully used an electronic compass on a robot inside a house
> to help with localization? I was thinking that if a bot knew it was facing a
> certain direction then it would only have to search an internal map for
> landmarks known to be in that direction.
>
> The kind of compass I am talking about is something like the Hitachi HM55B
> Compass Module sold by Parallax.