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Author Topic: First project: Laser tripped flash gun  (Read 1561 times)
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Did you say you powered the laser diode directly from the arduino? I've been looking some info on this for ages, as I like you haven't played with electronics for a good while and would very much like to build a trippy laser light show too! smiley
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Yes, I did.

I used a cheap laser pen.  It's not a particularly bright laser but it does the trick in a dark room.
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Just an idea (I've read about it somewhere on the net a few months ago): you could also trigger the shot via a microphone capsule. When the object hits the water you have a sound, and the capsule emits a signal. If you capture it with an analog pin and are polling it fast enough you could catch the moment where the water jumps up after the object sinks.
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I've read about that too, but haven't got round to it.

I've got a hall effect switch and some rare earth magnets pulled from old optical drives - I was going to try use that at some point. I reckon it's likely to be more reliable than the laser/light sensor and adding a delay so you capture the right moment isn't difficult.
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