Hi!
I'm making a soccer robot (RoboCupJunior).

I need a VL sensor (Visible Light) sensor for the detection of the ball.

Note that the ball transmitts RED visible light in about 102Hz.

The ball is 102Hz, so, a narrow band-pass filter is needed to detect the ball. But how can I "DETECT" the ball? I mean, by photo-resistorcos or photo-diodes etc. There are too many visible light source in the place where I test my robot.

I need some information about the "narrow band-pass filter", the way to detect the ball(transfer the red light to voltage changes).

THANKS!

Stanley Lio