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31  Forum 2005-2010 (read only) / Frequently-Asked Questions / ...ARDUINO clock / speed ? on: March 21, 2009, 12:45:34 pm
Hello,
I intend to build a timed remote shutter release for a camera. For that I'd like to know if ARDUINO will open and close a relay within a fraction of a second (or to do what it takes to open and close a shutter in a camera). I know there is a parameter named millis(). For my purpose I would need to use as a fastest time of 0.125 millisecond (=1/8000th of a second).
Is that possible with an ARDUINO?
If not, what is be the fastest fraction of a second ARDUINO can provide to open and close a relay?
I would think this also depends on the relay itself (right?).
Feedback is highly appreciated.


32  Forum 2005-2010 (read only) / Bar Sport / Re: Newbe saying Hello! on: April 30, 2009, 08:03:04 pm
Hi Alastair,
how is Photo-Project comming along?
Thanks for providing the drawing about the Optocoupler. Works great.
Got mine finished based on 'Bracket-Meister' and it's working great. Had to change some of the code and now it flies 90%. The 10% I am having trouble with is that I cannot get a faster exposure than 1/10th of second in a fully controlled manner. How about you, do you also reach that limit when shooting in Bulb-Mode with ARDUINO? I am curious to know, though I assume it's the camera that does not allow to take a faster shot when in Bilb-Mode.
Have a look at my Project-Docu (not so thorough as yours) but still.
Looking forward to hearing from you.
Good luck, Hans. smiley-grin
33  Forum 2005-2010 (read only) / Bar Sport / Re: Newbe saying Hello! on: March 27, 2009, 06:30:50 am
...this is the place where I started my Project-Documentation for the 'electronic-remote-shutter-release-timer':
http://www.halo-photographs.com/long-exposure-hdr-photography/
Go to 'Resources...' at the bottom and open that Excel sheet, again observe the tabs at the bottom.
(Please keep it low key for now as there will be lots more edits.)
Regards, Hans.
34  Forum 2005-2010 (read only) / Bar Sport / Re: Newbe saying Hello! on: March 26, 2009, 03:25:28 pm
Hi Alastair,
I just added a post to your project blog offering to share some of the work in this respect I have done so far.
As you say there is not much to do untill the hardware arrives....
Well, my HW has not arrived yet, so I did some work regarding exposure times only. That's all I've got to offer for now.

In your blog you mention that you'd like to obtain 'more precise control of bulb exposures, i.e. 7.3s exposure time.'.
YESSSS, me too.
Also I really like your intention to have various kinds of triggering meachnisms activating the cameras exposure.
Cool, now we can catch an image of a drop of water hitting the surface without using a highspeed-exposures camera (or a baloon exploding).

So here is my question: in my calculations I found that (for my intentions) it is necessary to use mircoseconds instead of milliseconds. I'd assume that ARDUINO is able to handle that kind of really short instructions, BUT will the camera as well, when in Bulb-mode?
Another factor is that the shutterlag needs to be taken into account.

My intention is to build something very similar to the 'Bracketmeister' (by J.Geerds, NYC Panorama), but that the span of possible exposures reach into the realm of microseconds in 1/3EV steps (this is the work I have done so far).

Also I'd like to mention that I am neither a good source as a coder  :-[nor very knowledgeable in electronics :'(.

Nevertheless I hope I have woken up your interest and look forward to your response.

Regards, Hans.
35  Forum 2005-2010 (read only) / Bar Sport / Re: Newbe saying Hello! on: March 21, 2009, 07:00:39 pm
...nice work here, I like that. Also because I am working on the same but I do not such a nice Blog-documentation as you do.
You might be interested in the following:

http://newyorkpanorama.com/2009/01/21/long-exposure-night-hdr-photography-with-arduino/

By the way, I tried to commenting your latest blog-entry, but it would not let me. No worries.

Wünsche Dir viel Erfolg,
Grüsse aus Zürich, Hans.
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