Subject:
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Re: control train using rcx
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 12 Feb 2004 13:46:34 GMT
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Viewed:
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1491 times
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Hi im going to be turning the potentiometers by hand to control the motor of the
train. Should i be stepping down the motor voltage will that make any
difference?, i will be using the hall effect device on the sensor input of the
rcx and it will detect the train and hopefully stop it. Just not too sure how
to start programing the controls for increasing the speed and controlling the
brakes.
thanks
steven
In lugnet.trains, Chris Phillips wrote:
> In lugnet.trains, Steven Brown wrote:
> > Hi im currently doing a project that involves using the RCX to operate a train,
> > by using inertia equations. Problem is im not very experienced in using NQC
> > lanague. Im using potentiometers as controls on the outputs of RCX i will have
> > to write a program for inertia to use these controls to control the speed and
> > brakes of the train. On the track i shall be using the hall effect sensor this
> > will act as an emergency brake to stop the train before the end of the track.
> > Was just wondering if anyone could give me any tips on how to go about
> > programing this.
>
> How are you using the potentiometers on the RCX outputs? Are you using them to
> step down the motor voltage before it is applied to the tracks? Are you turning
> them by hand, or with a LEGO motor? And how are you using the hall effect
> device to stop the train? Does it short the track, or is it connected to a
> sensor input on the RCX?
>
> I've played with this type of thing a little bit. You can power a train from an
> RCX by connecting a motor output to the track. The problem is that the eight
> motor speeds don't provide very good speed control, especially if you want
> really slow train speeds. You will also want to use a 1.0 RCX so that you can
> run it off of an AC "wall-wart" power adapter. Otherwise your batteries will
> not last very long.
>
> I have also powered the train with a regular speed controller, but used a
> Technic Polarity Switch operated by an RCX motor to turn the power on/off and
> even reverse the direction of a train. This is much easier on the RCX (since it
> doesn't have to provide the power that moves the train) but it makes it much
> harder to control the speed of the train from the RCX. You could use an RCX
> motor to turn the dial on the speed controller, which would enable you to
> control the speed and direction of a train from the RCX. This might allow you
> to mimic the inertial effects of a real train.
>
> I have had very good success detecting trains using a magnetic reed switch,
> which is a lot easier to use than a hall-effect device. Simply wire the reed
> switch (in series with a 1K resistor) up to one of the RCX sensor inputs and
> program it as if it were a standard touch sensor. The train coupler magnets
> will close the switch and the RCX knows that a train is passing over the sensor
> and can take action accordingly. (see
> http://www.drvegetable.com/wks_rrcrossing.html for more details on this.)
>
> If you can provide a few more details about what you are trying to do (and what
> you've already tried) there are a lot of people here on LUGNET that can help.
>
> - Chris.
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Message has 1 Reply:
 | | Re: control train using rcx
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| (...) If you have a potentiometer wired between the RCX motor output and the track, you can use it to control the maximum train speed. This could be helpful, since a train running at the RCX's normal full motor speed is usually going pretty fast. (...) (21 years ago, 12-Feb-04, to lugnet.trains)
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Message is in Reply To:
| | Re: control train using rcx
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| (...) How are you using the potentiometers on the RCX outputs? Are you using them to step down the motor voltage before it is applied to the tracks? Are you turning them by hand, or with a LEGO motor? And how are you using the hall effect device to (...) (21 years ago, 12-Feb-04, to lugnet.trains)
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