🚀 go-pugleaf

fontana@dogwood.cis.ohio-state.edu (Mark Fontana) writes:
 


>A friend and I have some ideas for photographs using the "painting with
>light" technique.  In short, this involves taking a completely dark
>room full of interesting objects, opening the shutter, and popping a
>flash multiple times from various angles.  The hard part here is not to
>catch your own image or shadow in the picture.

>Well, I have an idea.  A friend of mine works in a photo lab and grabbed
>the guts of a dozen of those throwaway cameras with built-in flash.
>So I now have 12 identical little flash circuits, each running on its
>own AA battery.

>What I'd like to do is position these tiny flashes all around the room,
>then fire the first flash manually.  The other flash circuits would detect
>this main flash and delay for a preset interval before firing.  That is,
>the first flash would fire 1 sec after the main flash, the second would
>fire 2 seconds after the main flash, etc.

           <some stuff deleted.>
>Thanks,

>Mark Fontana

  Well, if I were going to do that, I wouldn't mess with light-detection. 
That would be incredibly difficult, especially building n amount of
circuits.  Instead, I'd make a "sequencer" circuit - probably a
combination of a 555 timer, a BCD counter, and a BCD-to-1-of-16 decoder. 
This would result in the outputs turning on, one at a time, at a preset
interval (depending on the r's and c's on the 555.) 
 
 I would then run tiny wires all over the room from the sequencer circuit
to each of the flashes.  You'd probably need driver transistors and
perhaps relays in order for a digital output to control the flashes.
 
 Sounds like an interesting photo technique.  I'd like to hear about it if
it works...  
 
 If you need chip numbers for the circuit I described above, I can dig
them up.  let me know.  
 
 If you really want a separate light-detector for each flash, it would be
a matter of photo transistors and driver circuitry hooked up to a 555
timer wired as a one-shot timer, wired in turn to the same driver
transistor / relay mentioned above and then hooked to the flash.
 
 Further questions - best to use Email, since I browse this group rather
quickly, and might miss a reply.
 
--------------------- 
Michael Moncur      mgm@world.std.com (preferred)
                    sysop@onlybbs.via.mind.org
---------------------

-- 
--------------------- 
Michael Moncur      mgm@world.std.com (preferred)
                    sysop@onlybbs.via.mind.org
---------------------