Searching \ for '[EE]: Infrared Communications' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=infrared+communications
Search entire site for: 'Infrared Communications'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: Infrared Communications'
2002\09\11@043613 by Jinx

face picon face
> > What do you want to do ? Data, speed, distance ???
> >
>   Joe, all three with a standard 5mW red laser diode module for tx
> and IR detector for rx
>
> best, Vasile

Red and IR laser diodes are pretty cheap these days and you can
get a 10mW and lens for about NZ$20 + driver. Still 20x more than
an LED though. Laser pointers can be cheap too. Good fun to play
with until you run out of cats to annoy

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2002\09\12@011959 by Jinx

face picon face
>  Are you talking about the Filters ZXF36L01W24 or
> ZXF103Q16 from Zetex?

Um, no. Those are electronic signal filters. I meant light
filters, eg the dark purple, almost black to look at, plastic
ones. You use them as sunglasses to block sunlight and
allow only IR through to the receiver, although most IR
receivers have a filter. Some don't, like the waterclear
Philips diodes I sometimes use. Those need a filter
added. I have some very dark red plastic that seems to do
OK, and I've heard that unexposed/developed camera film
frames (eg the ones at the end of the roll) works very well
but I've never tried it

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email spam_OUTlistservTakeThisOuTspammitvma.mit.edu with SET PICList DIGEST in the body


2002\09\12@120327 by Robert E. Griffith

flavicon
face
On the subject of IR comms... I am adding an IR xmitter to a project so it
can control consumer electronic devices.  Since 32, 38, and 40khz are all
used as carriers, I want to be able to select the freq that I xmit on.  To
generate the carrier I am considering these solutions.  I want to implement
it under ~ $3 and in a small space so I want to keep the parts count down.
A 8 pin IC with IC2 would be nice:)

1) 8 pin PIC.  Will the internal 4mhz osc be stable and accurate enough to
generate the carriers?

2) VCO.  Looking at Digikey, most VCO only did higher freq (>1mhz). I found
a PPL w/ VCO that would do the right range but in a 16 pin package.  I have
a spare PWM output that I could create voltage control from (its fixed
frequency, though).

3) 555 timer.  Not sure how I would control the frequency, though.

--BobG

{Original Message removed}

2002\09\12@132913 by Nelson Hochberg

flavicon
face
> On the subject of IR comms... I am adding an IR xmitter to a project so it
> can control consumer electronic devices.  Since 32, 38, and 40khz are all
> used as carriers, I want to be able to select the freq that I xmit on.  To
> generate the carrier I am considering these solutions.  I want to
> implement
> it under ~ $3 and in a small space so I want to keep the parts count down.
.
.
.
> 3) 555 timer.  Not sure how I would control the frequency, though.

http://www.reconnsworld.com/ir_ultrasonic_555timer40khzir.html

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email .....listservKILLspamspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body


2002\09\12@193920 by Jinx
face picon face
>   "Handbook of Optical Through the Air Handbook"
>
> Url:
>   http://www.imagineeringezine.com/air-bk2.html

"method is shown in figure 7e below. The unit uses 20
separate LEDs and 20 Fresnel lenses. "

"The system demonstrated a range of six miles when transmitting
voice audio information

6 miles with LEDs ? Probably tested under ideal conditions
but that's not bad at all

What a great resource for general and specific information

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservspamKILLspammitvma.mit.edu with SET PICList DIGEST in the body


2002\09\14@072709 by Peter L. Peres

picon face
On Fri, 13 Sep 2002, Jinx wrote:

>>   "Handbook of Optical Through the Air Handbook"
>>
>> Url:
>>   http://www.imagineeringezine.com/air-bk2.html
>
>"method is shown in figure 7e below. The unit uses 20
>separate LEDs and 20 Fresnel lenses. "
>
>"The system demonstrated a range of six miles when transmitting
>voice audio information
>
>6 miles with LEDs ? Probably tested under ideal conditions
>but that's not bad at all

There are optical data link kits that go to 20 miles line of sight on a 5W
or less ir laser (in almost any weather). These have been around for 15
years or so. There are several companies actively developing such devices.

Peter

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


More... (looser matching)
- Last day of these posts
- In 2002 , 2003 only
- Today
- New search...