Anyone ! Please!

Archiver

I am trying to assemble an infrared detection system for future use
on a bot,my problem is,all the scematics I've found use a 38khz IR
detector(3 pin)for more selectivity, and I happen to have a pile of
IR phototransistors
with matching IR LEDS (QEC113,QCE112,Fairchild). I'm sure there is
some way of using these, can someone point me in the right direction
as far as wiring and code.Thanks

Archiver

In order for those IR LED's to emit enough power to be seen by your IR
receivers, they need to be pulsed. About 40 kHz seems to be the right
frequency. The IR receivers may also need some amplification and
filtering to receive the signal across the link. Just the detectors &
LED's are not sufficient by them selves for transmission much beyond 6"
or so -- if that much. A 555 timer chip and some amplification with a
small transistor 2n3904 might just work for you.

HTH,

Leroy

beamnut wrote:
>
> I am trying to assemble an infrared detection system for future use
> on a bot,my problem is,all the scematics I've found use a 38khz IR
> detector(3 pin)for more selectivity, and I happen to have a pile of
> IR phototransistors
> with matching IR LEDS (QEC113,QCE112,Fairchild). I'm sure there is
> some way of using these, can someone point me in the right direction
> as far as wiring and code.Thanks
>
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Archiver

---
Thanks, I appreciate the help.I'm kinda new to this field, I've been
into the BEAM side of robotics until now,solar powered no micro's
ect.so photodiodes and touch sensors were the main mode of steering
and obstical avoidance.Whole new ball game here! Any idea of where I
can get some schematics on this topic for a BS2. I know I can just
buy a 40khz detector with matching LED but they seem a little tough
to locate and like I mentioned before I have a surplus of the other
components. Thanks again

In basicstamps@y..., Leroy Hall <leroy@f...> wrote:
> In order for those IR LED's to emit enough power to be seen by
your IR
> receivers, they need to be pulsed. About 40 kHz seems to be the
right
> frequency. The IR receivers may also need some amplification and
> filtering to receive the signal across the link. Just the
detectors &
> LED's are not sufficient by them selves for transmission much
beyond 6"
> or so -- if that much. A 555 timer chip and some amplification
with a
> small transistor 2n3904 might just work for you.
>
> HTH,
>
> Leroy
>
> beamnut wrote:
> >
> > I am trying to assemble an infrared detection system for future
use
> > on a bot,my problem is,all the scematics I've found use a 38khz
IR
> > detector(3 pin)for more selectivity, and I happen to have a pile
of
> > IR phototransistors
> > with matching IR LEDS (QEC113,QCE112,Fairchild). I'm sure there
is
> > some way of using these, can someone point me in the right
direction
> > as far as wiring and code.Thanks
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/

Archiver

Any Radioshack store has the receiver for about $3.50. The emmitter is simply
a 555 running at 38Khz driving a transistor switch that then drives the IR
LED.