Subject:
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Re: pneumatic switch control
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 23 Apr 1999 09:13:01 GMT
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Original-From:
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Geoffrey Alan Long <longg@#Spamcake#engin.umich.edu>
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Viewed:
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1089 times
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I just got my RIS as well as some pneumatic parts yesterday.
The timing couldn't be worse as I'm in the middle of finals
and can't spare much time for non-studying activities.
However, your suggestion inspired me to take a study break
and open up my new additions to my collection.
You can find pictures of my interpretation of you're idea on
my website (which didn't exist about two minutes ago):
http://www-personal.umich.edu/~longg/
My apologies for the large blurry pictures. I will take
better pictures and redo the page next week (after finals).
The mechanism does everything you suggested. When the motor
turns in one direction one side is free to rotate but the
other side is fixed via the ratchet. The outputs of the
differential each drive an eight tooth gear that dirves a 24
tooth gear that drives a four-bar linkage whose output
operates the pneumatic switch. This means there is a 3:1
ratio between the differential and the output. The yellow
2-bend beam cams off of the differential housing, depressing
the touch sensor twice per differential housing rotation.
Because of the symetry of the mechanism and the 3:1 ratio,
this means you can tune the mechanism so that you get an
"on" from the sensor for each switch position (and an "off"
in between switch positions).
Bottom line: You _can_ control two pneumatic switches (all
three positions of each) with one motor and one touch
sensor.
I welcome any comments and questions. My responses tomorrow
will be much more coherent than this message (it's 5:00 am
here).
night night,
Geoff
------------------------------------------------------------
Geoffrey Long longg@umich.edu
GSRA, Mobile Robotics Laboratory, University of Michigan
------------------------------------------------------------
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Pics of 1999 Mindstorms items
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| The press room at www.legomindstorms.com has some new pictures of the two new kits due out this year. From these pictures, it's clear that the "Scout" unit - in the Robotics Discovery Kit - is very similar to the RCX; it has only 2 inputs, and (...) (25 years ago, 24-Apr-99, to lugnet.robotics)
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Message is in Reply To:
| | pneumatic switch control
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| (...) I've been thinking about this a lot... What about using a differential to separate motor direction output. Turning one direction could control one switch and turning the other could control the other switch. The switches could be controlled in (...) (25 years ago, 22-Apr-99, to lugnet.robotics)
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