Subject:
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Re: is it possible to make a motor with a limited range of travel?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 18 Jun 2004 18:18:11 GMT
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Viewed:
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856 times
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"Brass Tilde" <lego-robotics@crynwr.com> wrote in message news:00a301c4552c$24a80690$3b65960a@ad.shps.net...
<snip>
> You should only need one touch sensor per rack. If you only have one motor
> per rack, then you should be able to use one sensor per motor (unless you
> have other stuff you need the sensor ports for, of course).
>
> M
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> A T A
>
> If you display in a monospaced font, the above should line up OK, otherwise
> paste it into something that does have a monospaced font. The illustration
> has the following components:
> M Motor
> R Rack
> A Actuator
> T Touch sensor (or light sensor)
>
> As the motor moves the rack, the actuators press the touch sensor or occlude
> the light sensor, which causes the motor to stop *and* switch it's
> direction, so that it can only go the other way. If the touch sensor is
> actuated, the motor can only go in the opposite direction it was before it
> was actuated, otherwise it can go in either direction.
>
> You could even use a rotation sensor and keep track of how many rotations
> have been made, and in which direction, to keep track of where the rack is
> in relation to the motor at all times. Not sure what the resolution is on
> the rotation sensor though.
>
>
I built something very much like this. I used a rack with a few 1x1 TECHNIC
beams in it. The touch sensor pressed against the side of the rack and was
normally closed. When a hole in one of the beams passed over the sensor,
it would open. I had one hole for centering the mechanism and two at the
ends to limit the travel. You could extend this idea with a long TECHNIC
beam and detect many different positions. Similar to the above, this will
require one motor and one sensor per rack, so a maximum of three with
one RCX. Pictures and description can be found here:
http://members.cox.net/markhaye/kd_elev.html
Mark Haye (markhaye(at)cox(dot)net)
Professional programmer. Closed source. Do not attempt.
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