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Topic: Help using the arduino to time a camera delay (Read 2 times) previous topic - next topic

AWOL

Quote
What I think I know about lightning, is that the fastest normal camera is not fast enough to catch a lightning when it has started. 
FWIW, CHDK claim their motion sensing is fast enough to capture lightning using some Canon cameras.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Nick Gammon


Nice piccies.   :)

How did you get the double/multiple exposure on one of the pictures?



The sensitivity was a bit high, so the flash went off twice.
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

lost_and_confused



Nice piccies.   :)

How did you get the double/multiple exposure on one of the pictures?



The sensitivity was a bit high, so the flash went off twice.


Still:  Nice effect.

Shame (maybe) you couldn't strobe the flash and get a real multiple image picture.

_6ix

Guys, I really apologise... I lost notifications on this thread and assumed it went down in a heap.

I just (really just) had the opportunity to test the arduino and my skills.  Long story short I got home from work knowing there were storms in the area... so I hit my parts jar for some reliable contacts for my arduino - used a motherboard fan header and usb header and wired them to my pot, and light sensor... in a massive hurry and the sky cleared.


Bugger.

Mate gave me a call and CHCH city was being hit so I made record speed on the 10 km drive to the beach and ....




Job done.

_6ix


Quote
What I think I know about lightning, is that the fastest normal camera is not fast enough to catch a lightning when it has started. 
FWIW, CHDK claim their motion sensing is fast enough to capture lightning using some Canon cameras.


I have been following CHDK - in fact the camera that took the photo above is running it, but it doesnt have a realtime "live view" so I have resorted to arduino... 

PaulS

Quote
Job done.

And an excellent job at that.

_6ix

Cheers bud.. and yeah, the sensor is slow... but adjusted properly (I have altered the code from the first iteration) I got about 7 photos...

I was banking on the fact it travels through the cloud & lights it up...  And I now have a couple more ideas to test.. but this chance only happens once every 20 years here.



lost_and_confused

#22
Sep 06, 2012, 07:36 am Last Edit: Sep 06, 2012, 08:15 am by lost_and_confused Reason: 1
Top marks!

Very nice piccies.

_6ix,

You maybe should post the "final" sketch and a picture of the hardware.  And maybe a schematic.

I have said I am sort of interested in this and may see be making something like that.


_6ix

I dont mind posting the code & photos of the layout - is it appropriate to post it in this thread?

AWOL

IMO, better to put it in the exhibition section, with a link to this thread.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

LMI

Interesting to see that this works.

I read about lighnings from Wikipedia and they said the lighnings is very short, less than a millisecond. Not a camera or a human can react this quick. Perhaps there are several lighnings and you get some of the later ones, or the air glows after lighning is over.

AWOL

Quote
, less than a millisecond. Not a camera or a human can react this quick

That's nonsense.
Humans can't, but a camera certainly could.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

MichaelMeissner


Quote
, less than a millisecond. Not a camera or a human can react this quick

That's nonsense.
Humans can't, but a camera certainly could.

Note, you generally want to pre-focus the camera to eliminate the time spent focusing.

I tend to agree with AWOL that most camera shutters just won't operate in the millisecond range, particularly the common mechanical shutter.  The fasterleaf shutters probably operate in the microsecond range.  There are some that do for high speed movies, but they tend to be expensive.

In general most of the high speed shots (balloon popping, bullet through the card, etc.) are done by shooting in a dark room with a long shutter speed, and having a high speed flash (usually at minimal power to get the smallest amount of time) fire off while the shutter is opened.  This goes all of the way back to the 1870's when Eadweard Muybridge connected many cameras to trip wires connected to flash units to prove that a horse's gallop had all 4 feet off the ground at one point.

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