Subject:
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Re: IR Line of Sight (was: Re: Fw: RcxCC Joystick controls)
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 7 Jan 1999 22:04:26 GMT
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Original-From:
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David C. Chen <dcchen@pacbell+nospam+.net>
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Viewed:
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1351 times
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Sending to you directly b/c lugnet won't recognize my posts (though I've
already registered with them!).
Assuming the walls and ceiling of your room are painted white (I read
someone quoting >70% reflectivity for IR w/ white surfaces). Would the
room wide reception be better with the IR tower pointing to the ceiling
and bouncing the IR signal down to the floor to a RCX w/ IR ports
pointing straight up?
I will try to check the range for this.
Dave
dcchen@pacbell.net
Don Hewitt wrote:
>
> I've had pretty good results by elevating the IR Tower (it stands on the
> computer desk), pointing the IR Tower toward the center of the room, and
> mounting the RCX so that its IR port is pointing up (make sure it is the
> highest point on the robot).
>
> I've been able to drive around the room, even when I don't have direct line
> of sight. It seems to work up to at least 10-12 feet away in this
> configuration, and you can turn the robot around in circles without
> introducing any directional problems. I must be getting good reflections
> from the ceiling / walls / or other objects in the room.
>
> Make sure that you set both ends of the IR connection to long-range, and
> avoid driving under tables or couches!
>
> Don Hewitt
>
> At 11:47 AM 1/7/99 -0600, Tom Rowton wrote:
> > I've given a bit of thought to the line of sight prob with the IR receiver
> > on the RCX and have come up with an idea that should help, as long as the
> > RCX and the IR tower have line of sight, no matter which direction the RCX
> > is facing.
> >
> > Lego purists - delete this message now. Read no further. <wink>
> >
> > Make a small mirror apparatus like the ones used to film in 360 degrees.
> > There may be new tech, but when I saw how it was done, filmers had multiple
> > cameras facing the sky, but pointed at a mirrors(45 degrees from camera's 0)
> >
> > Basically, you need a miniature disco ball poised above the IR receiver to
> > bounce transmissions no matter which direction you are facing. I know this
> > should work, as I do it with my TV remote all the time.
> >
> > Alternately, you could coat all surfaces in your house with mirrors, but...
> >
> > trowt
>
> <snip>
>
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
Message is in Reply To:
 | | IR Line of Sight (was: Re: Fw: RcxCC Joystick controls)
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| I've had pretty good results by elevating the IR Tower (it stands on the computer desk), pointing the IR Tower toward the center of the room, and mounting the RCX so that its IR port is pointing up (make sure it is the highest point on the robot). (...) (25 years ago, 7-Jan-99, to lugnet.robotics)
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