DIY Sound-Activated High-Speed Photography 106
eldavojohn writes "Have you ever wanted to catch the perfect photo with your SLR camera but couldn't time the shot just right? Photography enthusiast Matt Richardson brings us an instructional video over at Make Magazine that shows how to use some very basic breadboarding and an Arduino Nano to do some high-speed flash photography that is timed by sound instead of your finger hitting the button on the camera. He pops a balloon and smashes a wine glass to show some results. His code is available on Github, and you can find more of this sly hardware hacker on his YouTube channel."
The hell? (Score:1, Informative)
Why is that worthy of a Slashdot submi... OMG ARDUINO, WOOT!
Re:Quicker Than Sound (Score:2, Informative)
To do that, you'd need to trigger a high speed shutter, which is a lot harder to do.. there's usually a lag between when a shutter is triggered and when it actually takes a picture, and the mechanical shutters on most SLR's don't actually go much faster than 1/250s. The images you see of matches being struck and explosions happening and such are taken with motion picture cameras with very high framerates.
Although, with electronic shutters that are becoming more common, there might be a way to get actual shutter speeds of 1/8000s with minimal lag. Could be very cool.
Re:Quicker Than Sound (Score:2, Informative)
Re:Quicker Than Sound (Score:3, Informative)
6ms is long enough for something (like a balloon starting to pop) to happen.
Most people, if they try hard enough, can count to 10 aloud in 1 second. That means they are speaking with the capable thought around 100ms. Now, just imagine how high you can count in your mind, not speaking aloud, in 1 second. How many instant thoughts can you get? How many milliseconds is it to process the next number in your counting scheme for you?
Now try watching a baloon pop. Try capturing that moment where the shape is Juuuuust starting to rupture - even though it's no longer holding the air in. How fast do you think that went? It wasn't like 1ms, but it wasn't 100 either.
The big thing to consider is the technically difficult issue of trying to get the baloon to pop and take a picture based on "Light" - something I think the GP completely overlooked. The reason we use sound is because its easy to set up a trigger for that - because the trigger is actually the baloon popping, not our own specific timer. A baloon doesn't produce a flash of light when it pops - so you can't use light to set off your photo, unless you are trying to detect the difference in shape of the baloon on a really tiny scale and hope it sets off your radar triggers or something incredibly complex - because simply timing the photo with your needle doesn't always work.
Sound is simply the simplest way.
Re:Quicker Than Sound (Score:3, Informative)
That's why they sell lightening triggers that use the lightening flash itself to trigger the shutter. Camera lag is an issue, but not with the higher end cameras.
I only use the nighttime long-exposure method as the lightening triggers are a little pricey for my taste.