On Mon, May 10, 2004 at 12:39:19PM -0800, Steffen Maisch enlightened us
thusly
> Is anyone familiar with the electronics of Nikon SLR cameras?
I doubt it.
> I have
> the following problem: In principle, most of these cameras (at least
> my F75 and D100) can be remotely controlled by an IR remote control.
> They have an IR sensor that responds to a IR signal sent from the
> remote control which has the same effect as pressing the
> shutter-release button. There is no data transmission other than this
> one signal, so it shouldn't be complicated. I don't want to use a
> remote control, but instead want to construct a system that shoots one
> photo automatically any few hours. First i asked Nikon about the
> trigger signal, but they just answered, they won't say. Then i tried
> it with square waves at an IR LED and any frequency, pulse width, duty
> cycle etc. The camera never responded. Then i wanted to buy a simple
> remote control (called ML-L3) just getting the answer that it is
> obsolete. Searching the interet also gave nothing useable. Now my
> question is: Does anyone know how this remote signal has to be? Or
> does anyone have the remote control and maybe could try it with a
> phototransistor connected to an oscilloscope. I'm especially
> interested to know whether it is just a continuous wave signal with
> specified frequency etc., or it is something more complicated like a
> digital serial bit-by-bit coding? Thank you very much!
These things are inclined to have a 'language' as follows. A number
(e.g. 0-63) is transmitted in binary by IR. The chances are this thing
may talk back, which will give you the frequency. Have you tried
outputting a stream of digits at 9600 baud? If it was ever going to talk
to a pc, they would use a known frequency like that.
If you can see what chip it uses in driving the IR, you can look the
data up on that. Otherwise, you are up against it. Often asking
unofficially from the bottom up produces enough for you to get started.
Phone the repair depot, & plead with them.
Another lazy approach: Look for a more modern system, (digicam, or even
vcr) from Nikon and try the remote from them, in case the design is
compatible. I would also try a remote from a tv, if you are determined
enough. Then you even buy one of these remotes that does every tv under
the sun..... happy pressing :-/.
With Best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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