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PICList Thread
'[OT]: IR communication'
1999\02\01@190535 by Lynx {Glenn Jones}

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Hello everyone,
I want to communicate with my robot via IR, but im having trouble with the
recieving hardware. My first idea was to simply use a phototransistor to
output a voltage relative to the light level, and capacitatively couple
this to an op-amp wired as a comparator. This turned out to be too
insensitive, (maximum range was less than a foot). I do not want to use
the 40KHz modulated sharp modules, as they are too expensive. preferably
the hardware would involve an op-amp, a phototransistor and a few passive
compnents. anyone have any ideas? thanks.

------------------------------------------------------------------------------
A member of the PI-100 Club:
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058209749445923078164062862089986280348253421170679

1999\02\02@015053 by Vincent Deno

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Try using an phototransitor hooked up to an active band-pass filter
running into a comparitor.  Did the trick for a simple project of my own.
Obviously, using a single chip with several op amps will take very little
real estate.

Good luck,
Vince

On Mon, 1 Feb 1999, Lynx {Glenn Jones} wrote:

{Quote hidden}

1999\02\02@094529 by FThompson9

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    Those Sharp IR detection modules are $3.59 at Radio Shack, and $2.88 from
Digi-Key.  Thats got to be less than the components your using to try to get
useful signal from a PIN.  They are very nice to use as well.  The
automatically compensate for lighting conditions and optimize the reception of
40KHz flashing IR signal.  The 40KHz flashing can easily be generated by
another PIC using the TIMR2 PWM program (AN564), my code looks like:

#define  bank0  bcf     STATUS,5
#define  bank1  bsf     STATUS,5


    movlw     0x04          ;[00000100] enable timer
    movwf     T2CON      ;using timer 2
    movlw     0x0C          ;[00001100] use PWM mode
    movwf     CCP2CON
    movlw     .125
    bank1
    movwf     PR2           ;period register
    bank0
    movlw     .62
    movwf     CCPR2L     ;pulse width

    I have used this code on 16C6x and 16C7x chips that have a timer 2.  It
generates a constant 40KHz pulse stream.  I suspect that you could modulate
this signal by modifying the TRISC,1 bit (input no signal, output 40KHz).  May
need and external resistor for this, I have not tried it yet.

Hope this helps
Pherd

1999\02\02@135204 by Lynx {Glenn Jones}

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I think i know what an active band-pass filter is, it filters out all
signals execpt thoes that are in a range of frequencies. my question is,
does anyone have a schematic for such a circuit? Also, what freqencies did
you allow it to pass? I'd rather not use any modulation (whiuch is what
this sounds like) but if absolutely nessasary, i will.

------------------------------------------------------------------------------
A member of the PI-100 Club:
3.1415926535897932384626433832795028841971693993751
058209749445923078164062862089986280348253421170679

On Tue, 2 Feb 1999, Vincent Deno wrote:

{Quote hidden}

--
> > A member of the PI-100 Club:
> > 3.1415926535897932384626433832795028841971693993751
> > 058209749445923078164062862089986280348253421170679
> >
>

1999\02\02@140011 by Lynx {Glenn Jones}

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Well, actually, the components i have are LM324 quad op amps which cost
about $.50 a piece, and IR phototransistors at about $.30 a piece, which
is only $.80, so adding a few resistors, and capacitors, this is much
cheaper... but if all else fails, i may have to resort to the modules.

------------------------------------------------------------------------------
A member of the PI-100 Club:
3.1415926535897932384626433832795028841971693993751
058209749445923078164062862089986280348253421170679

On Tue, 2 Feb 1999 spam_OUTFThompson9TakeThisOuTspamAOL.COM wrote:

{Quote hidden}

1999\02\02@145040 by goflo
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"Active Filter Cookbook", by Don Lancaster, is available,
and worth what it costs...

Jack

1999\02\02@150043 by Mark Winters

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I have to agree with Pherd, below: spend the extra $2 and use the modules.
I've found them to be very reliable and, as he also states, it's pretty
simple to use a PIC in the transmitter to generate the 40KHz modulation.

Just my two cents...

Mark Winters

{Original Message removed}


'[OT]: IR communication'
2004\10\22@170239 by =?iso-8859-1?Q?=C5ke_Neehr?=
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Hello!

I want to learn me about the communication between
IR transmitter and receiver together with a PIC.

Anybody who knows of any good side about that
on the web?

Regards
ÅkeN
___________________________________________

2004\10\22@175323 by David Minkler

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www.irda.org

Look for specifications under the developers tab

Dave

Åke Neehr wrote:

>Hello!
>
>I want to learn me about the communication between
>IR transmitter and receiver together with a PIC.
>
>Anybody who knows of any good side about that
>on the web?
>
>Regards
>ÅkeN
>____________________________________________

2004\10\22@185834 by Omer YALHI

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For an easy start you might want to check out this developer kit

-----Original Message-----
From: .....piclist-bouncesKILLspamspam@spam@MIT.EDU [piclist-bouncesspamKILLspamMIT.EDU] On Behalf Of
Åke Neehr
Sent: Saturday, October 23, 2004 12:01 AM
To: .....piclistKILLspamspam.....MIT.EDU
Subject: [OT]: IR communication

Hello!

I want to learn me about the communication between
IR transmitter and receiver together with a PIC.

Anybody who knows of any good side about that
on the web?

Regards
ÅkeN
___________________________________________

2004\10\22@190207 by Omer YALHI

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Sorry for the earlier message, I hit Ctrl+Enter accidently!

For an easy start you might want to check out this developer kit from
microchip:

MCP2120 - 2150 Developer's Kit User's Guide - 51246a.pdf

Regards, Omer

-----Original Message-----
From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTMIT.EDU [piclist-bouncesspamspam_OUTMIT.EDU] On Behalf Of
Åke Neehr
Sent: Saturday, October 23, 2004 12:01 AM
To: @spam@piclistKILLspamspamMIT.EDU
Subject: [OT]: IR communication

Hello!

I want to learn me about the communication between
IR transmitter and receiver together with a PIC.

Anybody who knows of any good side about that
on the web?

Regards
ÅkeN


___________________________________________

2004\10\23@013412 by Luis.Moreira

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Hi AkeN
I presume you are talking about irDA, Microchip have this chip that will do
the protocol for you the MCP215X. The application notes are very good and if
you are into Visual C++ it tells you how to write applications.
In the process of reading the application notes you will find links to the
irDA standard and other useful info.
Hope it helps
Regards
       Luis

-----Original Message-----
From: Åke Neehr [KILLspamake.neehrKILLspamspamtelia.com] Sent: 22 October 2004 22:01
To: RemoveMEpiclistTakeThisOuTspammit.edu
Subject: [OT]: IR communication

Hello!

I want to learn me about the communication between
IR transmitter and receiver together with a PIC.

Anybody who knows of any good side about that
on the web?

Regards
ÅkeN
___________________________________________

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