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 19:05:12 GMT
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Original-From:
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Ben Williamson <benw@pobox.ANTISPAMcom>
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Viewed:
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928 times
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On Thu, 26 Aug 1999, Tilman Sporkert wrote:
> 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.
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 attached to which port.
They can also print building instructions that have different colour
switches for different functions. It doesn't matter which inputs you wire
the sensors to, the software can figure it out and do the right thing.
Neat.
I don't have a CyberMaster set, so I'm just guessing from your
description. Does this seem reasonable?
- Ben.
-------------------------------------------------------------------
Ben Williamson benw@pobox.com http://www.pobox.com/~benw/
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | RE: Touch Sensor as a Switch
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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 (...) (26 years ago, 26-Aug-99, to lugnet.robotics)
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