Re: How to design an infra-red circuit to detect small obstacle (e.g. finger) ?

From: anwar (anwar09_at_yahoo.com)
Date: 02/13/05 

Date: 13 Feb 2005 14:24:19 -0800

Larry,
 - I do need a narrom detection indeed. So if I have a 2 feet
separation and there is a narrow beam where if someone place a finger
or pass his finger thru the narrow beam quickly it should detect that.

- As per level of gain- I need to make a sound of a certain frequency
when the obstacle is detected.

So, if you can please provide me details on how to make a circuit like
that it will be wonderful.

Thanks,
Anwar
http://www.bluehawk.biz
http://www.bluemela.com