Subject:
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Re: Tasks vs. program slots
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 20 Sep 1999 15:59:32 GMT
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Viewed:
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2435 times
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In lugnet.robotics.rcx.nqc, Dave Baum writes:
> What exactly does the Sharp IR receiver do? If it uses Sharp's ASK
> modulation, then you may have a problem. Ideally, what you want is
> something like a phototransistor to a good preamp, followed by a bandpass
> around 38kHz, then some sort of detector (e.g. a comparator). You'll also
> need some sort of AGC control to bias the preamp and/or detector.
Dave,
It is basically just exactly what you describe. It usually takes about 200us
or so to "see" the incoming 38KHz signal, common I suppose for an integrator to
react to the signal getting through the band-pass filter, then a Schmidt
trigger to kick when the integrator has a good enough signal there. It can
handle the 2400 baud stuff with no problem. It will give a '0' when a signal
is present and a '1' when it isn't, so this will work just fine with the logic
of the RCX and company.
What I am wondering is if the IR remote uses the same byte/inverse byte
format as the RCX message scheme...
DLC
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Message has 1 Reply:
 | | Re: Tasks vs. program slots
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| (...) Yes, it appears to use the same packet level formatting. It does use a new bytecode (0xd2) that isn't seen elsewhere. This bytecode needs two bytes of data to follow. These three bytes of "payload" are encoded the usual way with a three byte (...) (25 years ago, 20-Sep-99, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Re: Tasks vs. program slots
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| (...) What exactly does the Sharp IR receiver do? If it uses Sharp's ASK modulation, then you may have a problem. Ideally, what you want is something like a phototransistor to a good preamp, followed by a bandpass around 38kHz, then some sort of (...) (25 years ago, 18-Sep-99, to lugnet.robotics.rcx.nqc)
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