As good as a stepper, and subject to the same terrain limitations - in either case if a tyre slides on the surface at all it won't run straight and accurate.
for say 3 seconds let the robot move in straight path.. after that it turns right.. again after 3 seconds it turns right.. to move in clockwise direction..
I advice you to choose time yourself so that it accurately travels the side length of 1 meter..
for say 3 seconds let the robot move in straight path.. after that it turns right.. again after 3 seconds it turns right.. to move in clockwise direction..
I advice you to choose time yourself so that it accurately travels the side length of 1 meter..
it will move in a straight line.. because.. we are using three strepper motors two for tyres on the rear ... and one is mounted on the front.. to change the direction..
Nigel Goodwin said:
Using stepper motors will help greatly with both problems, but even then if a tyre ever slips at all it's then off course.
we all have seen a wheel chair used in hospitals.. its tyres are available in market easily.. they cannot slip because of bigger size.. when compated with stepper motor..
Using DC motors it will be considerable, with steppers it will be better, but still might not be good enough - unless it's over a VERY small distance.
it will move in a straight line.. because.. we are using three strepper motors two for tyres on the rear ... and one is mounted on the front.. to change the direction..
we all have seen a wheel chair used in hospitals.. its tyres are available in market easily.. they cannot slip because of bigger size.. when compated with stepper motor..
A wheelchair has feedback, the 'driver' controls it and keeps it straight.
Try locking the controls of an empty wheelchair and send it down a straight corridor - try it multiple times - then see how many times it doesn't hit the walls!
yes... it is effective in a small distance about 7-10 metres... but if in a larger distance.. we should use.. servo .. i feel..
Nigel Goodwin said:
A wheelchair has feedback, the 'driver' controls it and keeps it straight.
Try locking the controls of an empty wheelchair and send it down a straight corridor - try it multiple times - then see how many times it doesn't hit the walls!
I would call that a LONG distance - even your body isn't that good - close your eyes and try and walk a straight line for 7 - 10 metres!. Make sure you have a friend there to shout and stop you, as you're likely to fall over things, walk across roads etc.
i am talking about the small tyres used in a wheelchair.. that you are seeing in front.. can be used with stepper motor..
I would call that a LONG distance - even your body isn't that good - close your eyes and try and walk a straight line for 7 - 10 metres!. Make sure you have a friend there to shout and stop you, as you're likely to fall over things, walk across roads etc.
You could get a compass module, but even those are not 100% accurate, and they are expensive.
The only other thing I can think of is to design a servo system that will lift the front end and move it 90 degrees each time. But you will have a VERY hard time eliminating drifting over time, unless you do a line follower.
If the square is set up in one location then maybe you could get 4 lasers on fixed mounts that the robot can use for a referrence. That might work out pretty good with a stepper motor to help keep the distances consistant.