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'Pioneer remote control using PIC16f84'
1997\08\27@120840 by Raymond J. Ward

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I would  like to build a wired remote control unit for a Pioneer Large screen TV
system.
I have to output 33 different pulse width signals, 67 bits long for each of the
different control
functions. Only 6 different pulse widths.

             8580us           636us   636us            636us
example -   __________        _____   _____             _____
           |         |       |    |  |    |            |    |
           |         |       |    |  |    |            |    |
           |         |       |    |  |    |  //        |    |
                     --------     ----    - // ---------
-----------------------
                       4200us     432us    //   1504us            38008us

           | <--- START ---> | <------- SIGNAL ------------>|<------- STOP
------->|
           | <---------------------- 103 ms
-------------------------------------->|

I want to use the PIC16F84 & a 24LC16B EEPROM that I have avail if possible.

If someone out there has done this already I would appreciate any advice you
could give me, so I
won't reinvent the wheel. All comments welcome !

Thank you

Ray Ward
spam_OUTrwardsTakeThisOuTspamgte.net

1997\08\27@132151 by myke predko

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Raymond,

I haven't done it for Pioneer brand I/R remotes, but I have for the Sony
spec.  What you're missing (and what's probably most important) is the
modulation frequency (generally 32, 38 or 40 KHz - Sony uses 40 KHz).

When I did it for the Sony, I created a 80 KHz Timer Interrupt and
incremented a "Real Time Value" and toggled an I/O bit each time I entered
the Interrupt Handler.  In the mainline of the program, when I was sending a
"1" (modulated at 40 KHz), I simply enabled the TRIS bit for the number of
80KHz "ticks" to send the pulse (the same thing was done for sending no
signal at all).  The I/R Tx LED was wired as a normal diode.

I used the I/R Tx/Rx LED pair from Radio Shack to generate and receive the
signal (receiving to debug it before I sent it to my stereo).

This method really won't be that precise in terms of timing, but my Stereo
likes it just fine!

myke
>I would  like to build a wired remote control unit for a Pioneer Large
screen TV
{Quote hidden}

"One must invoke enough raw truth to punch a hole in the world" - Darl Af

1997\08\27@153956 by R.J. Ward

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Myke,

This is a hard wired remote - no I/R transmitter & no modulation just
waveform type  listed below.
I was thinking along same line. Using TRIS bit string for pulses, but
I'm hung up on what freq to run
clock (crystal). I guess I'll just do it by trial & error.....

Thank you

Ray

myke predko wrote:

{Quote hidden}

1997\08\28@144133 by paulb

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R.J. Ward wrote:

> I was thinking along same line. Using TRIS bit string for pulses, but
> I'm hung up on what freq to run
> clock (crystal). I guess I'll just do it by trial & error.....

 What crystal is used in the remote sender you are emulating?

 Cheers,
       Paul B.

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