Subject:
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Re: IR Problems
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Fri, 13 Apr 2007 14:22:21 GMT
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Viewed:
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12077 times
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In lugnet.robotics.rcx, <dickswan@sbcglobal.net> wrote:
>
> Elizabeth is quite right. It's easy to get collisions on the IR "bus" if
> two devices are sending (or replying) simultaneously.
>
> What I've done in the past with two RCXs is define one RCX as primary
> that is periodically (every 100 to 250 milliseconds or so) sending a
> message to the secondary device. The secondary device only sends
> messages immediately after it has received a message from the primary.
>
> The time between primary polling is chosen to be long enough to ensure
> the primary message, and the optional secondary reply are both complete
> before the next poll starts.
Thank you for the excellent information concerning communication with more than
one RCX. Last night in a dream I realized that I could just bypass communication
placing two push button sensors where needed driving the additional RCX. The
information is very much appreciated. Thanks, Tom, http://tomlohre.com/lego.htm
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Message is in Reply To:
 | | RE: IR Problems
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| Elizabeth is quite right. It's easy to get collisions on the IR "bus" if two devices are sending (or replying) simultaneously. What I've done in the past with two RCXs is define one RCX as primary that is periodically (every 100 to 250 milliseconds (...) (18 years ago, 2-Apr-07, to lugnet.robotics.rcx)
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