Subject:
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RE: best tape to mark a line on the floor to follow?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 1 Jan 2000 17:05:26 GMT
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Reply-To:
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tking@together.net!stopspam!
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Viewed:
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720 times
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I did an experiment with my 9 year old
Granddaughter on several kinds of tape.
NET: "friction tape" is best. This is a tar-black
fabric tape that is intended for taping
handles of baseball bats, hockey sticks,
and other important items.
She wrote an NQC program that runs a vehicle
forward for 2 seconds while acquiring data from
the light sensor about 100 times per second. This
data was downloaded using the RcxCC facility, and
saved to a text file. I then showed her how to use
Lotus 123 to produce different graphs (she has some
experience with hand-drawn graphs). Then I showed
her how to import the text file into Lotus and mark
the relevant data and make a line graph.
I think all the data and the graphs are in her notebook
50 miles away, but I'll try to get them and post them
some time. BTW I found this a very good educational
project with a simple initial questions: (1) What is the
best tape? and (2) what value should be used in her
program for 'lighter' and 'darker'.
**** Found her code ****
//light tester: Sarah 11/23
#define left OUT_A
#define right OUT_C
#define litesensor SENSOR_1
#define FOREVER true
int LiteValue;
task main()
{
SetSensor(litesensor,SENSOR_LIGHT);
CreateDatalog(100);
OnFwd(left + right);
repeat(99)
{
LiteValue = litesensor;
AddToDatalog(LiteValue);
Wait(1);
}//end of repeat
Off(left + right);
}//end of task
******
Best you use this to test your OWN tapes!!
Also, the friction tape:
1. Doesn't stick all that well, and can be repositioned
2. Can be 'curved' somewhat.. more easily than others.
I keep thinking I'll program something more complex
with the RIS, but I'm having more fun with 4 grandchildren
doing things at their own level. Next: A smoother
line-following algorithm with the 11-year-old, and beginning
to make mazes with tape and wooden blocks with all 4 kids.
Can anyone suggest how to begin to discuss PID-like
approaches to line-following, separating the error
function concept from the control concept?? I mean,
at a very basic level.. I am just starting having her
try to draw out the geometry of what's happening, and
so far she has just gotten to tracking 'how many times
did we see black in a row' and starting to be adaptive.
I mainly want to be able to have her understand something
about RATE of change and Time Constants.
Boy, this stuff is fun!
--
Regards,
Terry King ...In The Woods In Vermont
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Message is in Reply To:
 | | RE: best tape to mark a line on the floor to follow?
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| If you're worried about removing the Electrical tape, why don't you put down a strip of masking tape, then put the electrical tape over the top of it. Personally, I've never had any problems removing electrical tape from things. I seem to use it as (...) (25 years ago, 30-Dec-99, to lugnet.robotics)
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