Hi all

I am trying to determine a direction based on a sound wave hitting 2 sensors one on the left and one on the right hand side of the PCB,

the math is pretty easy basically it is just

Direction = asin(deltaTime/MaxTime)

where maxtime is the maximum time it could possibly take to get from the right to the left sensor.

deltatime is the actual time it took between the 2 sensors.

Now I have diligently created a sine lookup table for the first 90deg and all is working well, I get an angle assuming that I am in quadrant 1, (right sensor receives first) if the left sensor receives first then I know that I am in quadrant 4.

The problem is that I don't actually know whether the source is in front or behind me,(is the source at angle x in Quadrant 1 or 2)

I hope that this makes sense, any ideas would be appreciated.

I thought that I could replicate the Left Right layout for a front rear layout (giving for sensors) but I would prefer not to do this if possible>


Regards

Marshall