Serial communincation between two Microcontroller using IR

[nikhilele]

I want to make serial communication between two microcontroller using
IR.
but i donot want to use IR reciever moudels (from vishay) instead i
want to use simple IR led as transmitter and IR photo-diode as
reciever.
to decrease the cost.

 

[Rene Tschaggelar]

I want to make serial communication between two microcontroller using
IR.
but i donot want to use IR reciever moudels (from vishay) instead i
want to use simple IR led as transmitter and IR photo-diode as
reciever.
to decrease the cost.

Decrease cost ? Well, you need to design a decent
receiver first.

Rene

 

[Glenn Gundlach]

I want to make serial communication between two microcontroller using
IR.
but i donot want to use IR reciever moudels (from vishay) instead i
want to use simple IR led as transmitter and IR photo-diode as
reciever.
to decrease the cost.

Digi-key has logic output IR receivers for $1.08

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=17080&Row=142878&Site=US

That will simplify things considerably though you will have to modulate
the transmit end but it is not at all difficult.

GG

 

[nikhilele]

and that decent reciever can be built using opams like lm324

 

[nikhilele]

is it necessarry to modulate the signal cann't we send it as ASK or OOK
signal

 

[Luhan]

is it necessarry to modulate the signal cann't we send it as ASK or OOK
signal

You wont get much range unless you use a modulated signal. The
modulation and the coding can all be done in software...

http://members.cox.net/berniekm/remoteir.html

This is how I did my 2-way IR link.

Luhan

 

[Rene Tschaggelar]

and that decent reciever can be built using opams like lm324

Oh, can it ? At what speed for what baud rate ?
With a fixed gain ?

Rene

 

[Richard Henry]

I want to make serial communication between two microcontroller using
IR.
but i donot want to use IR reciever moudels (from vishay) instead i
want to use simple IR led as transmitter and IR photo-diode as
reciever.
to decrease the cost.

Please define cost.

 

[Rich Grise]

I want to make serial communication between two microcontroller using
IR.
but i donot want to use IR reciever moudels (from vishay) instead i
want to use simple IR led as transmitter and IR photo-diode as
reciever.
to decrease the cost.

Get the modules from Radio Shack. ;-)

Good Luck!
Rich

 

[Luhan]

Get the modules from Radio Shack. ;-)

Those recievers go for about $4 in the little metal can. They are VCR
leftovers. The TSOP4838 from digikey is about $1 and fits in a smaller
space.

Luhan "El Cheapo" Monat

 

[Rich Webb]

is it necessarry to modulate the signal cann't we send it as ASK or OOK
signal

With a modulated signal (typically around 40 KHz) from the sender and a
bandpass filter for the same modulation frequency on the receiver then
you can be relatively immune from spurious signals, particularly big DC
signals like sunlight or even incandescent bulbs.

An outgoing signal is easy to modulate. On the receiver side, you'll
have to run the numbers to see whether it's more cost effective to spend
non-recurring engineering costs in designing your own receiver or to
just buy a canned module.

If it's for self/class/curiousity, then a build-it-yourself would be a
fun project. If for a commercial product, much harder to justify. There
may also be patent issues involved in a new design where, presumably,
royalties and rights for commercial use would already be part of the
price of an off-the-shelf unit.

 

[nikhilele]

I have got some IR reciever module from the local market costing 0.4$
it is like TSOP1738 module,

 

[nikhilele]

Total cost should be of project should be less then 5$

 

[roxlu]

Hi,

I've done a similar project where I used two pic16f628 to communicate
using
rs-232 over infrared. I've posted some messages on this yahoo group:
http://groups.yahoo.com/group/jallist/

Search for IR and rs-232. I've got a design at home, which I can send
to you.

Greetings Roxlu

 

[nikhilele]

I have designed the same using 89c2051 controller
and its working fine.

now I am planning for RF.