Subject:
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Re: Help me convert this train program to use events (NQC)
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 28 Nov 2005 17:20:46 GMT
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Viewed:
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5719 times
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In lugnet.robotics.rcx.nqc, Steve Lane wrote:
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In lugnet.robotics, Jordan Bradford wrote:
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For Christmas I’m setting up a LEGO train on top of a narrow wall, so it has
to operate like a shuttle -- stop at each end and reverse motor direction.
My first attempt had a train regulator attached to a polarity switch, with
the switch being turned by a stepper motor I rigged up controlled by an RCX.
When the train reached a “station” it would hit a touch sensor and the RCX
would pulse the stepper motor, reversing the track polarity. This version
works as a prototype, but I don’t have enough cords to reach the touch
sensors I would have put at each “station” in the full layout.
So now I’m going to power the train motor directly from an RCX that rides
along as one of the cars. I’ll use light sensors on each end of the train to
look for white tiles placed between the track rails at each “station.”
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If the rcx is on the train why not mount touch sensors on the underside
looking down. You could then attach small ramps to the track which would
trigger the sensor. If you put the sensors on a spring loaded mounting you
shouldn’t have problems with the ramp potentially lifting the wagon as well
as triggering the sensor.
Steve
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That was basically my plan if I couldn’t get the light sensors to work reliably.
Based on Brian’s post I might go back to my original design, though.
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