Subject:
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RE: weird headers
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 23 May 1997 14:28:13 GMT
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Original-From:
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Fred Cass <FCASS@NEXTWAVETELihatespam.COM>
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Viewed:
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3974 times
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> > > On a more Handy note, is there any way to change the modulation
> > > frequency coming out of the HandyBoard's IR output? ie. 32.75kHz? Is
> > > the frequency from the HB's hardware or from the software?
>
> > yes. Change R4. Put a pot there if you like.
> > (smaller resistance -> higher frequency)
Thanks, I stuck a pot in it's place and fiddled with it until I got
4.49k and it worked great. I came up with the 4.49k by taking
1/x*.0068 = 32.75. Where .0068 is the cap, and 32.75 was my desired
frequency. So x was determined to be 4.49 which results in
32.752521...... Once I locked the pot in to that value, things seemed
to work perfectly. I get a range of 6-8", which is just fine for what I
wanted to do.
One strange thing was that it wasn't until I put the LED into a Radio
Shack LED panel mount holder that I got consistent results. I had tried
a soda straw wrapped in electrical tape, and other things, but nothing
seemed to focus the IR as well as the LED holder. So it works great
now...
Actually I need to get a hold of a scope and see what the actual
frequency is coming out of there, since I still only get hits when
something is moving in front of the detector.
Thanks again for everyone's help. Gee, now I have the Polaroid sonar
and Vector 2X compass on the way. When is that expansion board going
to be done again? <grin>
-=Fred Cass=-
fcasshb@usa.net
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