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First Lego League in Virginia and DC

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sridhar kowdley <[log in to unmask]>
Sat, 9 Oct 2010 10:28:13 -0400
text/plain (4005 bytes) , text/html (6 kB)
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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