Subject:
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Re: IR tower question
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 18 Nov 1999 15:11:28 GMT
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Viewed:
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747 times
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Robert,
I hope an electronics person tells me I'm wrong, because this is where I'm
stuck too. The serial port sets 2400 baud. But my understanding is that we
have to get the Palm to generate a 38kHz signal. That is, pulse the IR led
on/off at 38kHz.
So, someone tell me if I have this right: to send a '0' bit the Palm IR
needs to pulse on and off at 38kHz for 1/2400 of second.
Does the standard for IrDA just turn the IR on and off, or does it have a
carrier frequency too?
Mike
Robert Eddings <webmake@bellsouth.net> wrote in message
news:3833C702.F3E23CF0@bellsouth.net...
> I realize that the signal sent is 38 kHz at 2400 baud but isn't that set
> by the serial port?
>
> Robert Eddings
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Message has 1 Reply:
 | | Re: IR tower question
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| IrDA turns 'on' the IR for every 0 bit and holds it upfor ~ 1/2 of the period of the transmission frequency.(more on (URL) For these reasons its better to set the IrDA transmission frequency to 2x38kHz=76kHz and send 0x55 or other similar (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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