Any experience in robotics?

basilmarket.com forums : Chat | 8 posts archived

thread starter popokill Aug 02 2010 + PM | QUOTE | PERMALINK | REPORT

For the last few days, our group was struggling to make our robot turn a perfect 90 degree angle. The program we use, logo blocks, uses seconds to determine the angle of the turn. My question is; How many seconds (most likely fractions of a seconds) will a robot have to turn to make a full 90 degree angle? We tried .90 (of a second), .45, .30, .10, .75, and many other combinations, but none seem to be accurate. D:

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tommiev1993 08/02/10 + PM | QUOTE | PERMALINK | REPORT

uh well that depends on the engine I guess?

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Daedalus 08/02/10 + PM | QUOTE | PERMALINK | REPORT

@above Right but the best way is just to guess and check. (Sadly) I had trouble with it to.

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M0neyJ4cker 08/02/10 + PM | QUOTE | PERMALINK | REPORT

wut servo and program

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popokill 08/02/10 + PM | QUOTE | PERMALINK | REPORT

[quote] M0neyJ4cker : wut servo and program [/quote] Idk but we use Logo Blocks to program, and the stuff we use to make it comes from an "iBox" kit.

My Characters: AranOut - 81 Windia Aran in Misery

taleko 08/02/10 + PM | QUOTE | PERMALINK | REPORT

what you do is time it to turn a 360 then divide the time by 1/4. then work your way from there. Another way to get this more accurate is to draw a triangle on the floor measuring 3m by 4m by 5m (i.e. right angled) then to have the robot travel along the 3m side, perfom a turn at the 4m junction, then to continue along, then you can use how far it is off course by to try to get this more accurate. Also by simple guessing of the sort of system you are using i'm thinking there wouldn't be a fixed amount of time it take to make a 90` turn since different models could have different track widths?

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walridge3 08/02/10 + PM | QUOTE | PERMALINK | REPORT

Time required is dependent on the servos/motors used, as even physically identical parts will be subtly different on the inside. Best bet is to guess and check, or use taleko's triangle method. Another method is (if you're trying to rotate in place 90 degrees) to use a light sensor if available and have it go from one black line to another black line 90 degrees away.

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Camdon 08/02/10 + PM | QUOTE | PERMALINK | REPORT

[quote] taleko : what you do is time it to turn a 360 then divide the time by 1/4. then work your way from there. Another way to get this more accurate is to draw a triangle on the floor measuring 3m by 4m by 5m (i.e. right angled) then to have the robot travel along the 3m side, perfom a turn at the 4m junction, then to continue along, then you can use how far it is off course by to try to get this more accurate. Also by simple guessing of the sort of system you are using i'm thinking there wouldn't be a fixed amount of time it take to make a 90` turn since different models could have different track widths? [/quote] Sometimes I sit back and think "What doesn't Taleko know?" LOL

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