Subject:
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RE: Touch Sensor as a Switch
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 26 Aug 1999 07:41:32 GMT
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Original-From:
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Tilman Sporkert <tilman@activesw.comNOMORESPAM>
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Viewed:
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912 times
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In response to my own post on the Cybermaster touch sensors:
The three different Cybermaster touch sensors have a resistance of 15k, 12k,
and 10k when not pressed.
The rest of my ramblings were pure fiction. The three Cybermaster inputs are
independent just like on the RCX. The Cybermaster software doesn't care
about the resistance either - you can simply switch the sensors around, and
everything works the same.
So why did they put three different resistors into the Cybermaster touch
sensors? Mindstorms touch sensors don't have such a resistor in them. The
resistors are in parallel to the sensor contacts, not in series. So if you
hook multiple sensors in parallel to one port, you still can't tell which
one was pressed. You can't reasonably wire Lego 9V components in series.
Even then, the resitor values are too close together to produce reliable
readings.
Whatever the reason behind those resistors is, it might be applicable to the
RCX as well. I just can't figure it out.
> > The Cyber Master touch sensors come in three
> > colors, each has a different values in its resistor.)
>
> Very, very interesting. I wonder why that is? Maybe Cybermaster has really
> only one analog input internally, and maybe Cybermaster measure the
> resistance to figure out which sensor is pressed. The Cybermaster
> set has no
> other sensors, only the three touch sensors.
>
> One of the Cybermaster models is a gladiator with a sensor on
> each shoulder
> and one on his belly. After building the model you go through a
> step by step
> sequence were you have to press each sensor once. I wonder if that is done
> so that the computer can learn which sensor (white, yellow, or red) is in
> each position? That would certainly fit with the rest of my assumptions.
>
> Can anybody confirm any of that? I will play with my Cybermaster a little
> tonight, and report back.
>
> Tilman
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 3 Replies:
 | | Re: Touch Sensor as a Switch
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| Tilman Sporkert skrev i meddelandet ... (...) It's for the CM software - it's targeted for younger kids than the RIS. As the sensors have different color (and open resistance), the software assumes you build the models as described, and then just (...) (25 years ago, 26-Aug-99, to lugnet.robotics)
| | | RE: Touch Sensor as a Switch
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| (...) My guess would be that it lets you determine which colour switch is attached to each input, when it is in the open state. Kind of a nice idea actually - just attach a switch to any port, and the GUI can remind you which colour sensor is (...) (25 years ago, 26-Aug-99, to lugnet.robotics)
| | | Re: Touch Sensor as a Switch
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| (...) Connecting N touch sensors in parallel requires N pieces of wire, while doing so in series requires N+1 pieces of wire. See? It's not that bad. Here is my experimenting results of connecting the three Cyber Master touch sensors to RCX in (...) (25 years ago, 27-Aug-99, to lugnet.robotics)
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Message is in Reply To:
| | RE: Touch Sensor as a Switch
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| (...) Can you describe that? Are you connectiong the Lego wires with only one stud overlapping? I don't have software to display your LDRAW file. (...) Very, very interesting. I wonder why that is? Maybe Cybermaster has really only one analog input (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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