Subject:
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Re: RCX and IR Range Characteristics?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 24 Apr 2001 19:44:31 GMT
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Viewed:
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3816 times
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hi Ralph,
I think I'm lucky.
I just did some experiments with a modified IR-tower.
The modifications were: the "keep alive trick" from John Barnes and my own trick to add a few more diodes to get rid of the 9V battery.
Without a batttery in the tower (switched to long mode) and the RCX (NiCd's 7.1 V) I get a good communication over 4 meters (I think thats about 14 feet). If I check bare communication (with a standard RS232 driver, not spririt.ocx) I get a 4 meter range from tower to RCX. From RCX to tower is larger than my room (8*8 meter) and I can point to any location in my room.
I think the tower without a battery still can be improved (because all my remote controls from TV etc, mostly with 2*1.5V batteries perform better).
I hope John Barnes will draw the circuit diagram and then I'll see further.
Ralph Hempel wrote:
> Hi All,
>
> A while back, Ben Erwin asked about other user's experiences
> with the IR tower and range.
>
> I'm trying to characterize a persistent problem with
> the pbForth serial library, with respect to message reliability.
>
> It seems that even in high range mode, I can't communicate
> more than a few feet with my RCX and tower. I'm using a 9V 800mA
> adapter with no load on the RCX to power both the tower and
> the RCX.
>
> I'll measure the voltage eventually to see if the tower is
> pulling the supply down, but I doubt it.
>
> I've looked through the legOS source and see that it prefers
> near range comms, I've found these the most reliable too.
>
> When I do pbForth work in classrooms, I end up having to cover
> the bots with towels to keep the stray IR out, but I'll be
> darned if the bots communicate more than a few feet away.
>
> Maybe that's why the remote has to send messages over, and
> over, and over...
>
> Does anyone else have some IR experience they would like to
> share with the group?
>
> Cheers, Ralph Hempel
met vriendelijke groet,
Stef Mientki
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Message is in Reply To:
 | | RCX and IR Range Characteristics?
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| Hi All, A while back, Ben Erwin asked about other user's experiences with the IR tower and range. I'm trying to characterize a persistent problem with the pbForth serial library, with respect to message reliability. It seems that even in high range (...) (25 years ago, 24-Apr-01, to lugnet.robotics.rcx)
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