Here’s another DIY project for you photography types out there. Did you know it’s possible to build your own sound activated flash? You can, building a box known as a “Picture-Axe”. This device uses a microphone to determine when the action happens, causing the flash to fire and the camera to take a picture.
Enthusiast “renkku” from the Let’s Make Robots forum built his own device, and was kind enough to include step by step instructions on how to build one of your very own.