I have a project where I need to make a switch that is activated with a laser pointer. I have a general idea on the schematic and design, but I am not sure what to use for the detection of the laser. Does anybody know a good component to use for this? I am looking for a component and its data sheet so i can design the opamp interface and get the initial design turned in. Thanks!

 

a small solar cell such as the ones you find at Radio Shack, make good laser detectors....

 

Is the use of an opamp a requirement?

Since this is a homework assignment, it really belongs in the Homework forum.

However, a comparator is really what you need.

A CdS light-sensitive resistor might provide what you need in the way of light sensing. It's slow to respond, but adequate with human movements.

 

A photodiode also can also work.

You may want to consider some type of reflector too. You didn't say how far away the user will be, but it might be hard to hit a small spot on the wall across a room. Some reflective Mylar in a cone shape might help.

 

I have a project where I need to make a switch that is activated with a laser pointer. I have a general idea on the schematic and design, but I am not sure what to use for the detection of the laser. Does anybody know a good component to use for this? I am looking for a component and its data sheet so i can design the opamp interface and get the initial design turned in. Thanks!

Can you confirm whether this is a homework assignment?

hgmjr

 

yes the opamp is required. I know that it would be real easy to do with a comparator but i need to include either an opamp interface or a 555 timer somewhere in it.