Subject:
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Re: HB IR port
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 26 Mar 1997 04:53:27 GMT
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Original-From:
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Pandit Panburana <pdp@ix.ANTISPAMnetcom.com>
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Viewed:
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1600 times
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Hi Terry,
I believe the transmitter circuit already include the 40Khz carrier.
You need to write code to modulate the carrier with the low
frequency of your information that you want to transmit too.
You can do it with simple on/off at the lower duty cycles,
for example. The software will driver this to PA6. This way,
it does not bog down the controller (do not need to generate
40Khz carrier by software).
You have to have external resister for current limit the IR LED.
The one on board LED is for visual aid that you turn on/off the
IR Tx.
Did you look at the WEB page of the Handy Board ? There might
be sample code there.
Regards,
-Pandit
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> From: King, Terry <terry.king@FMR.Com>
> To: handyboard@media.mit.edu
> Subject: HB IR port
> Date: Tuesday, March 25, 1997 5:21 PM
>
> Hello everyone,
> I'm interested in trying, possibly using the 40 Khz IR emitter port on
> the HB. What is required to activate it? If it is code driven, does it
> bog down the controller much? Also if it is code driven, does anyone
> have some sample?
>
> Is the port already current limited or do I need to add a resistor to
> the emitter LED?
>
> I really enjoy this mailing list alot. There's so much to be learned
> from so many.
> Thanks,
>
> Terry King.
> Terry.King@fmr.com
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