Subject:
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Question about Lego Mindstorms Infrared Protocol.
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 13 Dec 2004 16:29:22 GMT
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Original-From:
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Jeeninga, J. (Jesper) <J.JEENINGA@EWI.stopspamUTWENTE.NL>
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Viewed:
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1160 times
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Hello,
From http://graphics.stanford.edu/~kekoa/rcx/protocol.html site I got
the description of the RCX infrared protocol.
Now I tried to send the opcode for a double beep, I calculated the
following:
Opcode: 5901 (beep beep)
binary = 01010101 11111111 00000000 01011001 10100110 00000001 11111110
01011010 10100101
hex = 55 ff 00 59 a6 01 fe 5a a5
Pulse scheme:
417 417 417 417 417 417
3753 3753 417 417 834 834
834 417 417 834 834 3336
3336 834 417 417 834 417
417 417 417 417 417 834
417 417
This didn't have any effect. But When I used the following pulse scheme:
417 417 417 417 417 417
417 417 417 834 417 4170
3753 834 417 1251 417 1668
417 417 1668 417 2085 417
834 417 2919 417 417 417
417 2502 417 417 417 417
834 2919 834 834 2085
(recorded from the remote control) I do get a 'receiving infrared'
signal on the RCX
This scheme translated gives:
01010101 01011011 11111111 00000000 01101110 11110100 00100000 10010000
00010101 1111101 01001111 11100110 0000
55 5B FF 00 6E F4 20 90 15 7D 4F E6 0
Which makes no sence to me... Although I do recognize the 55 and FF of
the header.
Where did I go wrong? I think it's the pulsescheme. I think I did not
use the right conversion from hex->pulses
Any suggestions anyone?
Thanks in advance
Jesper Jeeninga
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