i'm currently working on a project where I make a small object move towards a sound source. The object will be on a rail and only moves in 1 dimension (left or right). At the moment i'm trying to find out how to localize the sound source in relation to the object. So basically i'm looking for the following:
- localization of a sound source, does not have to be extremely accurate (just left or right)
- localization based on volume (no phase shifting etc.: too complex and expensive)
- arduino compatible
- super cheap (since I'm aiming at making a bunch of them)
At the moment i'm using two omnidirectional electret mic breakout boards from sparkfun: https://www.sparkfun.com/products/9964 and ordered some from deal extreme: http://dx.com/p/arduino-microphone-sound-detection-sensor-module-red-135533 (did not arrive yet so no results so far)
I have directed the two mic's in opposite direction about 10cm from each other. I made a simple cone (squared) to make them as directional as possible. It is working not too bad, but I hope i can improve the reliability and sensitivity.
What are the best ways too build this systems and what kind of cones should I make to get electret microphone as directional as possible (shape- and material wise)