Re: Motion Sensor with LED's

On 5 Mar 2007 12:41:05 -0800, "gethostbyname@xxxxxxxxx"
<gethostbyname@xxxxxxxxx> wrote:

You can use a simple infrared emitter diode and a photo-transistor
like detector. You need modulate the signal if you don't want to have
problems with other light/infrared sources like sunlight.

Optical filtering would help, as well.

Jon
.