IR Reciever

Archiver

I'm looking for info, mainly part numbers, on an IR reciever like the
one used with the BOE bots. The only difference is that i would like
to be able to run them off a different frequency. The BOE recievers
only read in 38kHz light, and i need a reciever that runs off a
different frequency so as not to get interferance if i have the two
working near each other.

However, i do realize that most recievers work in the 38-40 kHz
range, so if you happen to know of a cheap IR reciever that runs in
this frequency range, i'd still like to know about it.

Basically, i have 2 robots, one uses IR recievers which were included
with a BOE bot. An IR LED is connected to a 555 Timer to run at
38kHz as a transmitter, and reciever captures any 38kHz light
bouncing off any objects in the bot's path. I need a sensor for
another robot that will not interfere with the first. The best
solution would be if i could vary the recieving frequency, so i'd
never have to worry about it interfering with anything.

Archiver

Chris,

Here is some info on IR receivers for IRPD, wade through it, there
is a bunch there. Check it out and see what you think:

In order to stuff info in, here is the key to my contractions:
LS= less sensitive S= sensitive VS= very sensitive
GR= good rejection NR= easily swampable
HTF= can be hard to find
SP= small package MP= medium size package BP= big package
LP= needs low pass filter

Product Cost functionality
Sharp GP1U58Y (38KHz) $2.00 S, BP, NR: can be finicky, but overall good
Sharp IS1U60 (38KHz) $3.00 VS, NR, SP, LP, HTF: Difficult to use
LiteOn LTM-97DS-38 $2.50 S, GR, MP, LP: Good unit, I like these
LiteOn LTM-97DS-56 $2.50 S, GR, MP, LP: Good unit, I like these
Panasonic 4602 (38KHz) $1.35 LS, GR, SP, HTF: Good discrete IRPD choice
Panasonic 4612 (38KHz) $1.70 VS, GR, SP: "Best of class", metal shelled
Panasonic 4614 (56KHz) $1.70 VS, GR, SP: "Best of class", Good units.

Some comments on the above are in order now. The LiteOn modules I have
only found on Digikey. They come in 33,36,38,40 and 56.7KHz versions in
three package styles, use the DS, side facing or top facing style with the
pins regularly spaced. These are bigger than the Pan, or IS1U60, but MUCH
smaller than the Sharp "sugar cube" units.
The 4612 units come in 36.8, 38, 40 and 56.7KHz flavors, use the XD package
style - this has a metal wrapper on it, LEAVE IT ON, without that
wrapper it
gets ridiculously sensitive to any and all IR in the area!
The 4602 units have become scarce lately, too bad, they are really good
for those using the 555 style IRPD as they are very selective, although not
as good a range (6-8" max) as the 4612s which can easily reach out 12"
or
more.

I have given up on the IS1U60's. They are hard to find, the most expensive
of the lot and very hard to use for IRPD. The Panasonic 4602 is the smallest
unit (about 1/4" x 3/8" x 1/8"), the Sharp sugar cubes the largest (1/2" sq),
with the LiteOn units about 2X the area (not dimensions!) of the 4602.
How about pinouts? The LiteOn units have the same pinout as the Sharp
GP1U's, the Panasonic and Sharp IS1U60 have the Vdd and Vss pins swapped as
compared to the LiteOn/GP1U units.
I've re-done my IRPD boards with jumpers that allow using any of the above
modules and have made both 38 and 57KHz versions of my PIC chip too. I have
done the majority of my tests using LiteOn (Digikey 160-1061) 5mm 40 degree
IR LEDs using 1K or 2.2K resistors to limit current (it doesn't take
that
much!) 1K resistors give almost 12" of detection range in normal interior
lighting circumstances.

Where to get them? Here are some suggestions:
Sharp GP1U58Y - almost any surplus company, Radio Shack has equivilents
Sharp IS1U60 - HVW Technology, Future/Active, Reptron
LiteOn LTM-97DS - Digikey, Future/Active
Pan. PNA4602M - Digikey
Pan. PNA4612 - Digikey

For some example circuits check my webpages:
http://www.verinet.com/~dlc/botlinks.htm. For the 555 type circuit bonk
on the first robot (ugly wood platform, foam tires...) Go down the first
page to look at the circuit for a PIC based IRPD setup.

have fun,
DLC

Chris wrote:
>
> I'm looking for info, mainly part numbers, on an IR reciever like the
> one used with the BOE bots. The only difference is that i would like
> to be able to run them off a different frequency. The BOE recievers
> only read in 38kHz light, and i need a reciever that runs off a
> different frequency so as not to get interferance if i have the two
> working near each other.
>
> However, i do realize that most recievers work in the 38-40 kHz
> range, so if you happen to know of a cheap IR reciever that runs in
> this frequency range, i'd still like to know about it.
>
> Basically, i have 2 robots, one uses IR recievers which were included
> with a BOE bot. An IR LED is connected to a 555 Timer to run at
> 38kHz as a transmitter, and reciever captures any 38kHz light
> bouncing off any objects in the bot's path. I need a sensor for
> another robot that will not interfere with the first. The best
> solution would be if i could vary the recieving frequency, so i'd
> never have to worry about it interfering with anything.

--

---

Dennis Clark http://www.verinet.com/~dlc
dlc@v...

---

Archiver

DLC,

Hey, thanks alot. For what i need, the Panasonic 4614s running at
56kHz will do fine. I'd use the 4602s, but i too can't find any.
Digi-Key has none in stock and wont be getting any until near
August.

One other note, with the 4602s, i could increase the range to up to
about 3 feet and sometimes further by adding 2 LED's for every one
sensor. It can make a big difference.

-Chris