Subject:
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Re: Motor Sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 8 Jun 1999 18:35:04 GMT
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Viewed:
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990 times
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In lugnet.robotics, lego-robotics@crynwr.com (Laurentino Martins) writes:
> > Would it not be possible to use a
> > motor as a rotation sensor? I think my example would be more suitable
> > as a speed sensor though.
> > Lets say you have a drive shaft, you feed a motor
> > off that shaft. The motor would then act as a generator. You then take
> > the generator and hook it to an input port on the RCX.
> [...]
>
> I'm not sure but I remember something I read in this group that the inputs on • the RCX can only read resistance. Someone correct me if I'm wrong...
>
Pretty close. Really it reads current, resistors are a good way to select
this current, but its really the current that is sensed.
His idea of using a motor as a "speed" sensor is sound. You can take the
signal that the motor generates, rectify and filter it and feed it back
to the RCX through a current limiting resistor and get a reasonable result.
I think,
DLC
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Message has 1 Reply:
 | | Re: Motor Sensor
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| Dennis Clark <dlc@verinet.com> wrote in message news:FD0uAG.G9s@lugnet.com... (...) select (...) Actually the RCX reads voltage. In any of the passive modes it reads from 0 to 5V. There happens to be a pull up resistor (10K to 5V) internal to the (...) (25 years ago, 9-Jun-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Motor Sensor
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| (...) [...] I'm not sure but I remember something I read in this group that the inputs on the RCX can only read resistance. Someone correct me if I'm wrong... Laurentino Martins [mailto:lau@mail.telepac.pt] [(URL) you check the web site first?: (URL) (25 years ago, 8-Jun-99, to lugnet.robotics)
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