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### Author Topic: how much robot moved algo  (Read 3748 times)

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#### benji

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##### how much robot moved algo
« on: January 07, 2008, 04:28:24 PM »
hey folks, i need help to find an algorithm to measure how much did my robot moved a stright line(its a hexapod)
i can do this by software but i still would want to use my only sharp ir to make sure both measurements are very close and reduce the error,,help
good ol' BeNNy

#### airman00

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##### Re: how much robot moved algo
« Reply #1 on: January 07, 2008, 04:58:13 PM »
Hexapod......

I guess use soemthing like a IR speed gun ( find speed of car , etc.) , point it on ground on robot and then calculate distance and add it up.

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#### Tsukubadaisei

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##### Re: how much robot moved algo
« Reply #2 on: January 08, 2008, 04:59:36 AM »
By counting the number of steps(or by addind a constant distance every time you robot moves or something like that), if you dont want to use an external reference. Controlling the movement of a walking robot is way easier than a wheeled robot(if you are not using a steper).
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#### Rebelgium

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##### Re: how much robot moved algo
« Reply #3 on: January 08, 2008, 06:45:29 AM »
Don't you have a problem calculating the distance when you move over different types of ground.
eg. on a carpet (very high grip) you'd move more distance than on a slippery tile floor...
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#### benji

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##### Re: how much robot moved algo
« Reply #4 on: January 08, 2008, 07:20:15 AM »
thnks guys for answers but problem is when i add up distances every step there would be heaps of error,,true rebelguim, thats why i need some algo using my sharp ir , problem is not always there are stuff in front of my ir,, thats when i need to stay under my error mercy,,,,,,
anyone knows how to do this by SLAM? thats would be helpfull
good ol' BeNNy

#### Admin

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##### Re: how much robot moved algo
« Reply #5 on: January 08, 2008, 01:07:34 PM »
Quote
problem is when i add up distances every step there would be heaps of error
why? do the legs slip? considered putting big rubber pads on the feet? or made the feet needle sharp?

keep your similar posts together:
http://www.societyofrobots.com/robotforum/index.php?topic=2746.0

#### benji

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##### Re: how much robot moved algo
« Reply #6 on: January 09, 2008, 07:33:32 AM »
well yea after 3 meters of walking i do expect legs to slip,, and a difference of 1 or 2 cms would ruin my map
good ol' BeNNy

#### paulstreats

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##### Re: how much robot moved algo
« Reply #7 on: January 09, 2008, 08:07:07 AM »
souns like somebody needs SLAM

#### SmAsH

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##### Re: how much robot moved algo
« Reply #8 on: January 13, 2008, 06:49:06 PM »
hmm... would say the speed gun...its usually right. do you know of the hot wheels speed gun its like \$15 us...really cheap
Howdy

#### paulstreats

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##### Re: how much robot moved algo
« Reply #9 on: January 14, 2008, 02:16:36 AM »
or a sensitive 3d accelerometer possibly

#### benji

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##### Re: how much robot moved algo
« Reply #10 on: January 15, 2008, 12:10:31 PM »
whats a speed gun and 3d accelerometer?
good ol' BeNNy

#### Admin

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##### Re: how much robot moved algo
« Reply #11 on: January 17, 2008, 02:00:38 PM »

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