Subject:
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Re: Design Question - For a newbie
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 31 Dec 1999 19:11:32 GMT
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Viewed:
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965 times
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In lugnet.robotics, Peter Vogel writes:
> [...]
> you need a motor to trigger the firing pin, unless you do some
> sort of mechanical linkage which would make the front bumper a trigger...
You might be able to do just that and link the bumper directly to the firing
pin. Once that is put together and working, position the touch sensor on the
firing mechanism so that it is always depressed. When the gun goes off, the
touch sensor is relased and you have your trigger.
It's kind of hard for me to put into words - see if you can understand this
ASCII art:
### ___\ pivots this way
### / /
### /
###
#O#
###
###
###
###TTTTTTTT
###TTTTTTTT
###TTTTTTTT
###
### = lever arm
TTT = touch sensor
O = pivot point
When the lever arm is rotated in the direction of the arrow, the touch sensor
is released.
(BTW: there was some discussion about placing this setup next to a track to
detect when trains go by; the beginning of the thread is at
http://www.lugnet.com/robotics/?n=9450)
> The L3GO from the DDK has a single-motor driving the left front wheel, the
> right front wheel is just on an axle, while the rear wheel is a caster wheel
> that has a very limited travel, when you drive the motor forward, the caster
> wheel pulls straight, and the robot travels straight, when you reverse, the
> wheel swivels *slightly* to make the robot turn. Pretty cool engineering
> actually.
I've seen that too - they've managed to implement a go-forward/turn-in-reverse
without using a differential. R2D2 has a similar mechanism that determines -
using the direction of the motor to spin a little sub-assembly - which way it
will drive.
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Message is in Reply To:
 | | Re: Design Question - For a newbie
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| (...) and (...) sensor (...) Except that you need a motor to trigger the firing pin, unless you do some sort of mechanical linkage which would make the front bumper a trigger... The L3GO from the DDK has a single-motor driving the left front wheel, (...) (24 years ago, 31-Dec-99, to lugnet.robotics)
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