Re: infrared wall to detect an object

Thad Smith schrieb:
Hernán Sánchez wrote:
I create a virtual wall using a laser
....
The problem is the photorresistor that it is sensible to natural light
....
I don't have any information on a IR emitter, but suggest you look at modulating
the beam. By using a narrow filter on the detector, you should be able to filter
out ambient light changes and use a lower power.
I second that.

In school we built an infrared sender and detector, both running off 9V
batteries, using a simple photodiode and a IR led.
IIRC it was about 10kHz modulated, 1:10 or 1:20, and worked 30m in
sunlight.

If you need it badly enough, I can dig up the schematics - although
that could take some time.


Regards,

Phil

.