 | | 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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| | Re: Tasks vs. program slots
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(...) The Sharp GP1U581Y is a 38kHz receiver that incorporates an amp, a limiter, a bandpass filter, and a demodulator ... outputs a low while receiving an IR signal, a +5V high when not. It does NOT do any decoding. (...) From what I've been seeing (...) (25 years ago, 18-Sep-99, to lugnet.robotics.rcx.nqc)
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| | Re: Tasks vs. program slots
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(...) They are one and the same. When transmitting, the IR tower just uses the RS-232 TXD line to switch on the 38kHz carrier. It also has some timing circuitry to keep it alive, and an Rx side, but the Tx is painfully simple. You'll probably see (...) (25 years ago, 18-Sep-99, to lugnet.robotics.rcx.nqc)
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| | Re: Tasks vs. program slots
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(...) 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 (...) (25 years ago, 20-Sep-99, to lugnet.robotics.rcx.nqc)
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| | 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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