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Old 6th January 2003, 07:21 PM   #1
nlinus is offline nlinus  Sweden
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Question Remote control

I am building a preamp and want to use a remote control with it. I have a remote that I would like to use.

Does anyone have any good examples of how to do that. The simplest thing would be to use a PIC16F84. But how do I program it?
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Old 6th January 2003, 09:37 PM   #2
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That would be the trick, now wouldn't it.

A friend of ours recently designed a remote control system
around the PIC and sold it to Parallax, which I believe will
be making it available soon, if not already. I would watch
for it.
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Old 7th January 2003, 12:50 AM   #3
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Default Re: Remote control

Quote:
Originally posted by nlinus
I am building a preamp and want to use a remote control with it. I have a remote that I would like to use.

Does anyone have any good examples of how to do that. The simplest thing would be to use a PIC16F84. But how do I program it?
I've never done this with a PIC, but I have done it with a basic stamp. It's actually not too difficult. The particular remote I hacked used the REC-80 (I think) encoding scheme. It was for a Quasar/Panasonic remote control. I used the remote to drive a stepper motor, with the volume buttons doing the UP/Down motions. I also have a few other button turn on and off LED's.

Usually the IR data is pretty simple to decode. If you have a scope and a receiver module, that should be all you will need.

I used a IR receiver module from RadioShack... ...it was a Sharp part number. The IR receiver module had a TTL output that was Low on IR Carrier at the input, and High on None. (IR remotes usually use a 40Khz or so square wave carrier, and then modulate this with the data stream.)

I then grabbed this data with the pulsin function of the Basic Stamp. Once I had a series of 32 pulse widths, I had the code. that's all ther was to it. (From memory, It seems to me pulse widths were 1800uS (Marker), 1200uS (one), and 800uS (zero)respectivley.. ..This'll make sense once you start reading about it)

I also have some basic stamp code, if you're interested...

Here's a link to get you started.
http://www.ee.ualberta.ca/~elliott/e...r/infrared.htm

-Dan
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Old 7th January 2003, 06:53 AM   #4
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Check out the home page of DIYaudio member Guido
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Old 7th January 2003, 07:08 AM   #5
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Hi,

I am willing to supply you with code and schematic if you like !
I used indeed a 16F84 and decoded the RC5 in it.


grtz

Simon
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Old 7th January 2003, 11:06 AM   #6
guido is offline guido  Netherlands
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Wow,

Somebody else posted a reference to my homepage..
But it does not seem to work now ?? When it is working,
it also can be reached by clicking www below.

On the page is the code for a pic16f84 to decode RC5. NOT the whole thing, since it is quiet specific (i have a tube preamp).

But if anyone wants some more code (I2C) or whatever, just drop me a mail. As for the overall program, i think you have to make it mostly yourself, so it fits your needs (preamp).

Greetings,

Guido B.
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Old 7th January 2003, 01:10 PM   #7
SDF is offline SDF  France
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Hello, in my remote preamplifier, I use a motorized potentiometer.
The RC5 codes are decoding by an ATMEL at90S1200, it's a simple µC easy to program and not really expensive, to program it, you only need a shareware (available on the web, more it's free) and the IC support, three resistors and a plug on the parralel computer output.
I made my preamp 8 months ago, and i never had any problems.
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Old 23rd February 2005, 12:31 PM   #8
jnt77 is offline jnt77  Greece
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SDF
it seems interesting,can you supply me more info?
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Old 23rd February 2005, 12:35 PM   #9
SDF is offline SDF  France
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I know, I use a PGA2311 controlled by at90s8515
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