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http://www.education.rec.ri.cmu.edu/previews/nxt_products/robotics_eng_vol_1/preview/content/projects/hallbot/forward/wheeldist/index.htm


This is the page I found to teach my kids about wheel circumference and 
distance. 

 (Hint: the large 8.2 cm wheel has a 10" circumference so your rotation equation 
will be 1" distance=.1 rotation :) Super handy when quickly adjusting the 
robot's distance during meetings.) 

This is where the lego robotics start to positively impact all other areas of 
learning.   I would not skip this lesson with my kids for another week of 
practice.  It brings math concepts to life and gives them useful, real life 
applications.  Now, it does seem a little advanced for 4th and sometimes 5th 
graders, but I am working with 4th-9th graders, and the kid's comprehension had 
to do with their math logic skills not their grade level, so don't shy away just 
because you're the first one to introduce this concept or because they are 
young. 

Good luck, 
Brandy




________________________________
From: sridhar kowdley <[log in to unmask]>
To: [log in to unmask]
Sent: Sat, October 9, 2010 10:28:13 AM
Subject: Re: [VADCFLL-L] using sensors


Anothe note--
 
Please do look at the wheels-- i think some of them have measurements in cm or 
mm I think.  You can translate this directly to rotation and convert it to 
distance.  

 
Time is also a problem if you vary the power.
 
Hope that helps.
Sridhar


On Sat, Oct 9, 2010 at 7:18 AM, Lloyd O'Hara <[log in to unmask]> wrote:

Cool idea, I like it and may borrow in the future.
>
>----- Original Message ----- From: "Eric Palmer" <[log in to unmask]> 
>
>To: <[log in to unmask]>
>Sent: Saturday, October 09, 2010 7:07 AM 
>
>Subject: Re: [VADCFLL-L] using sensors
>
>
>
>Also our team constructs a measuring gauge with a wheel/tire the same
>>size of the one on your robot. They put one of those orange pointers
>>on an axle and use some beams to make a handle. They then just set it
>>down with the point in a know position and then push it and count
>>rotations.  360 degrees = 1 rotation.
>>
>>This way they don't have to guess, program, download, run and rinse
>>repeat so often.
>>
>>It saves time.
>>
>>On Sat, Oct 9, 2010 at 6:30 AM, Lloyd O'Hara <[log in to unmask]> wrote:
>>
>>Heather,
>>>
>>>One thing for your team to lookout for is battry charge. When the battery
>>>charge lowers, it may take more time (seconds) to travel the same amount of
>>>distance as it did when the battery was fully charged. (see Curt's handrill
>>>analogy in a recent email).
>>>
>>>Our team generally uses degrees (1/360 of the circumference of the wheels
>>>you are using). Degrees, as well as other sensors, can be easily measured
>>>using the "View" function on the NXT.
>>>
>>>Lloyd
>>>
>>>
>>>----- Original Message ----- From: "Heather Houlden" <[log in to unmask]>
>>>To: <[log in to unmask]>
>>>Sent: Friday, October 08, 2010 10:05 PM
>>>Subject: Re: [VADCFLL-L] using sensors
>>>
>>>
>>>
>>>It is my first year as well, so we are learning too. However, my kids are
>>>>measuring the distances the robot needs to travel.
>>>>We programmed the robot to travel in a straight line for a set time (I
>>>>think it was 10 sec). Then they measured the distance travelled, and I
>>>>had them compute the seconds per inch travelled.
>>>>
>>>>Then they just multiply the seconds/inch by the number of inches the
>>>>robot needs to move, so that they can program the number of seconds
>>>>to move.
>>>>So far it seems to be working OK for them. There may be an easier way
>>>>to do it, but this is what they came up with.
>>>>Hope this helps!
>>>>Heather
>>>>Team Blockbusters
>>>>
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