Subject:
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Re: Speed of IR comms?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 3 Oct 2002 19:49:18 GMT
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Viewed:
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768 times
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"Rob Limbaugh" <lego-robotics@crynwr.com> wrote:
> On top of that half of the data being sent is for error checking (maybe
> where the 1200bps came from?). A better protocol would speed things up
> quite a bit.
With preamble, complement bytes and checksum, it takes 9 bytes to send
the 8 bits of data for a standard RCX message. That's only about 25 or so
messages a second!
The protocol used by Spybots & Manas eliminates the preamble and
complement bytes, doubles the baud rate to 4800 baud and consists
of short 2 byte messages which carry 12 bits of data (4 bits are used
for checksum). This allows for almost 10 times the number of messages
per second with each messages carrying 50% more data.
Mark
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Message is in Reply To:
 | | Re: Speed of IR comms?
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| ----- Original Message ----- From: "Steve Baker" <sjbaker1@airmail.net> Sent: Wednesday, October 02, 2002 6:53 PM Subject: Re: Speed of IR comms? (...) LEGO and CIR (Consumer Infra-Red) send signals on a modulated carrier frequency (36KHz, 38KHz, or (...) (22 years ago, 3-Oct-02, to lugnet.robotics)
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