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I have been working (when I should have been Working) on two things which
may be of general interest.
The first is a rotary electrical coupling, which allows you to pass 4 wires
through a rotary joint. I built the prototype tonight, and I think it
works pretty well IMHO. I developed this because I wanted to be able to do
a full 360 degree scan with a light sensor, without having to worry about
winding up the motor and sensor wires. The design is probably limited to 4
wires, due to the number of grooves on the standard Technic shaft, although
you could have 8 if you didn't overload them. This would make the thing
rather long, though.
The second is a 3 bit to 8 bit de-multiplexer, driven by the motor outputs.
I haven't worked out exactly how I am going to use this yet, but I am
thinking of using it in with "states" of motion....either you're driving,
or turning, or driving and turning, or scanning, or whatever else, etc.
The core of the thing is a 74HCT138. I suspect it could be improved by
those more electrically inclined than I, but it works so far in breadboard.
There are a bunch of compromises in this design, like giving up speed
control, but it does allow 8 (less intelligent) outputs.
I will have pictures shortly, and I would like to share, but I am WWWeb
impaired. I would be happy to send them to someone who would be interested
in posting them somewhere, but I would prefer not to respond to a lot of
individual requests. I have no idea how many of you there are out there
;>)
Fun stuff...my first projects.
Jeff
jeffrey.hazen@northmill.net
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Message has 2 Replies:
 | | Re: Rotary electrical coupling
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| Jeffrey Hazen <jeffrey.hazen@northmill.net> wrote in message news:01BF0C69.13794F...thmill1... (...) wires (...) I'd be interested in seeing this one. When I created my version of Grey Walters robot turtle I had to use a windshield wiper motion in (...) (25 years ago, 2-Oct-99, to lugnet.robotics, lugnet.robotics.rcx)
| | | Re: Rotary electrical coupling
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| G'Day If you are willing to use 'non-pure Lego' parts, then Radio Shack has a telephone cord 'detangler' that plugs into standard RJ-11 jacks, has 4 conductors, and 360 degree motion. Works rather well, esp. with some contact enhancer for a cleaner (...) (25 years ago, 5-Oct-99, to lugnet.robotics, lugnet.robotics.rcx)
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