Lyosha Kojenov was excited about high-speed photography. He has all the photo-setup, but has no equipment to trigger a flash at the right moment. I do not have all the photo set-up, but I have Arduino. We decided to combine efforts.

The idea is simple – something happen that makes noise – microphone catches it, amplifier amplifies it, rectifier rectifies it, Arduino measures it with ADC, add some delay and trigger a flash.

Studio shall be dark, camera shutter shall be open. That’s pretty much it.

First, I made audio amplifier on a breadboard.

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I had a nice electric screwdriver with a dead battery. I finally hooked it up and it works great.

Here it is:

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Our friends gave us something that looks like a useless bookcase. It had 3 shelves, but space there was too low and too deep. Back wall was partially missing. I needed a bookcase for my office.
I removed one shelf, moved the other to the middle (I had to drill a few holes to do it, therefore I consider it a project and put on my project web site), and completely removed the back wall. I’ve got a nice bookcase accessible from front and back sides with plenty of room for my books. I wonder how did live without it?

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