Search found 11 matches

by droidzz
28 Dec 2012, 22:18
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

If if the initial values we off though I guess it would be good enough to tell if i move by a certain amount of degrees
For instance if it said I was at 10 degrees and then i move by 90 degrees than it will read 100 i will have still moved by the correct amount of 90 degrees
by droidzz
28 Dec 2012, 21:10
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

I just thought, with all this talk of formulas and best tyres and so on might be irrelevant.
Can't I just use a compass sensor on the robot to find out very accurately when 90 degrees has been turned?
by droidzz
28 Dec 2012, 18:18
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

Do you have an example of what is best to use?
by droidzz
26 Dec 2012, 22:17
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

I tried with the adjusted formula and still it doesn't really match with any sort of reliability. Only just starting with Robotics and finding it very frustrating. So far I have only being able to move the robot forwards and backwards which is very limiting. You mentioned about tracked robots being ...
by droidzz
26 Dec 2012, 17:57
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

A tracked robot is one of the hardest to make precise movements based on dead reckoning. There is a very large amount of "tire" that is touching the ground, and it makes it very difficult to turn with any kind of accuracy. Would you recommend moving on to one of the other robots in the ki...
by droidzz
26 Dec 2012, 15:41
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

I tried the formula suggestions in this thread and wanted to post my results because the results are confusing Anyone know what I might be doing wrong? Which wheels are you using that have a diameter of 3.21cm? I have the NXT 2.0 set and built the initial quick start robot, the one that looks like ...
by droidzz
25 Dec 2012, 23:11
Forum: Mindstorms Projects
Topic: Calculating rotations of wheels for turning
Replies: 27
Views: 34562

Re: Calculating rotations of wheels for turning

I tried the formula suggestions in this thread and wanted to post my results because the results are confusing first some values - distance_between_wheels = 12.7cm - wheel_diameter = 3.21 - degrees_to_turn = 90 So if I apply the formula suggested.. (((distance_between_wheels * 2) * 3.14) / (360 / de...
by droidzz
25 Dec 2012, 22:34
Forum: Mindstorms Software
Topic: How to turn accurately?
Replies: 5
Views: 6725

Re: How to turn accurately?

Thanks for the replies.
I did a search but only found 1 related post here https://sourceforge.net/apps/phpbb/mind ... ing#p12063
so I will continue the discussion in that existing thread.
by droidzz
24 Dec 2012, 07:53
Forum: Mindstorms Software
Topic: How to turn accurately?
Replies: 5
Views: 6725

Re: How to turn accurately?

Thanks for the replies. What I meant is that in the default lego software i create a move block and tell it to move 90 degrees with the slider all the way to the right on the motor and it will move about 30 degrees and no where near 90 degrees. So I dont mean that its slightly off and as i understan...