what to do with laser torch

[aruna1]

hi
I have a laser torch (one that comes as a key tag).
is there anyway to do something useful with this?
like obstecle sensor? should be some thing that can be made with some comman components.
thanks

[Razor Concepts]

For an obstacle sensor you could use a camera to detect the beam, but that isn't very easy. You can't easily make an obstacle sensor with it.

[Soeren]

Hi,

I have a laser torch (one that comes as a key tag).
is there anyway to do something useful with this?
like obstecle sensor?

If it has to be simple, you could use it as a broken beam detector by shining it on an LDR.

For an obstacle detector, you need to modulate the beam and use a photo transistor with an amplifier with eg. a PLL tone detector (like NE567/XR567) that sense when the beam lights up an object. It will be more involved and ambient light might be a problem if used outdoors.

[aruna1]

Hi,

I have a laser torch (one that comes as a key tag).
is there anyway to do something useful with this?
like obstecle sensor?

If it has to be simple, you could use it as a broken beam detector by shining it on an LDR.

For an obstacle detector, you need to modulate the beam and use a photo transistor with an amplifier with eg. a PLL tone detector (like NE567/XR567) that sense when the beam lights up an object. It will be more involved and ambient light might be a problem if used outdoors.

HI,
can we sense reflection of laser beam? its not like sensing IR reflection

[billhowl]

Here are some link for Laser Rangefinder
http://letsmakerobots.com/node/2989?page=1
http://letsmakerobots.com/node/2651