Hi all,

I have searched here and there and the maximum distance that is offered is no more than 15 Meters and that too is with the OEM's drive electronics (like Polaroid), whereas I have to do it with my own electronics (caveman's electronics).

How about using the Laser instead of sonar ??

I want to use ordinary laser pointer (red dot) on the target.

Mind you, " THIS IS NOT RANGING "

I only want to get the red dot reflected back off a target (of rough surface) from a certain distance approximately 50 Meters.

So please help me how can I welcome the reflections. Is red dot going to reflect back enough luminance so that the photo transistor could still detect it.

OR

do I need some Lens in combination of amplifier to detect the refelected red dot.

Do I need to decrease the collimation off the laser pointer so that the transmitted laser is in a big circle instead of only a dot. I think it will facilitate detecting the reflections with lens.

Thanks

Babar

PS: this proximity sensing is a part of whole project which is 8052 based.