Subject:
|
Re: IR
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Thu, 22 May 1997 16:48:28 GMT
|
Original-From:
|
root <root@/AntiSpam/snotnose.wizard.org>
|
Viewed:
|
1397 times
|
| |
|
|
>
> Hello all,
>
> I've been playing with IR proximity sensors, and wonder if anyone can
> provide some suggestions.
>
> [...snip...]
> 1. I had a very difficult time getting any consistent reflectance...
> ..., it wouldn't detect anything unless I moved it quickly in
> front of the emitter/detector. If I stopped moving, it stopped
> detecting. Could this mean that the detectors really aren't 38kHz?)
I am not there with you obviously so I cannot see your exact situation
but when I was first playing around with the IR detectors (same kind,
38KHz from radio shack) I had the same problem. I finally tracked it
down to my IR clock being way off (by at least an order of magnitude-
don't recall now though which direction- probably too fast)- anyway
what I was detecting was a sort of "slewing" effect I reckon. I fixed
the clock and the effect vanished. Your mileage may vary.
> 2. Is there any way to change the frequency of the IR output so I could
> use the 32kHz IR detectors? If not, no big deal, I'll build Keith's
> circuit which is set up for 32kHz....
I think you'd have to rewrite the routine, at least poke some new values
for the clock/counter but overall probably not that difficult. I haven't
seen the source to all of that except briefly (though I expect to be
intimiately familiar with it soon... :)
> Thanks for any input,
> -=Fred Cass=-
Dunno if this is what your problem is, but I hope it helps.
John Whitten
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
