Subject:
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Re: how detect other RCX robots with light sensors?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 15 Apr 2000 04:13:25 GMT
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Viewed:
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1603 times
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Richard Hamilton wrote:
> Assuming both RCXs are facing each other, this can be done by using the IR
> transmitter of the RCX on the detected robot, and a forward pointing light
> sensor on the detecting robot. Set one robot (the detected robot) to send out
> constant IR messages. Set the other robot (the detecting robot) to first save
> the light reading of a forward pointing light sensor, then if the value is
> greater than 2% of the starting value, the sending robot is about 30 cm away.
> This assumes there is not greater than a 2% variation in the ambient light. If
> you substitute a D-IRPD sensor from Techno-Stuff for the light sensor, you can
> detect another robot sending IR traffic directly in front from over 90 cm away.
>
> If you do not send a constant stream of IR from the RCX to be detected, the
> light sensor will not work, and the D-IRPD will only have a range of about 12
> cm, which is shorter than your requirements. However the D-IRPD will detect
> other RCXs no matter which way they face, and will detect other objects.
>
> Connecting two light sensors to the same port will not accomplish what you
> want, and is seems to accomplish nothing useful, unlike stacking touch sensors
> or a touch sensor with a light sensor.
>
> In lugnet.robotics.rcx, Manuel Cabido Lopes writes:
> >
> > I want to know if there another RCX infront of me at a maximum distance of
> > 30cm. I tried to use only the light sensors but it was not enough. Does anyone
> > has already tried this. Maybe putting some light in the RCX like infrared (I'm
> > trying this). I'm obtaining better results if I put two light sensors
> > connected to the same port. Maybe this is for two reasons a kind of averaging
> > system and the increase of the dynamic range.
> >
> > Thank you
This does put quite the strain on your batteries though...
Dean
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Message is in Reply To:
 | | Re: how detect other RCX robots with light sensors?
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| Assuming both RCXs are facing each other, this can be done by using the IR transmitter of the RCX on the detected robot, and a forward pointing light sensor on the detecting robot. Set one robot (the detected robot) to send out constant IR messages. (...) (25 years ago, 15-Apr-00, to lugnet.robotics.rcx)
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