infrared wall to detect an object
- From: "Hernán Sánchez" <nanchez@xxxxxxxxx>
- Date: 10 Jan 2007 19:24:28 -0800
Hi.
For a project that I'm building, I need an object detector that signals
when something "cross" the virtual wall of light.
I create a virtual wall using a laser and two mirrors (one in front the
other). The laser goes to the front mirror, it reflects the light back
to the other mirror that is behind the laser, and it reflects back the
light and so on. An the end, a photorresistor sense the laser light.
When an object cross thru the light, the photorresistor change and a
comparator signals that something is passing thru the virtual wall.
The problem is the photorresistor that it is sensible to natural light
and of course the laser... it is dangerous for the eyes (an accident
can happen). Another problem is with the mirrors, they need to be
complete aligned to each other.
I want to change it to infrared light and a IR detector.. like those
used in remote controls. But I need some IR leds with a small
apperture to create a virtual wall.
Do anyone has some ideas, facts, experiences, suggestions and so on
about what to do ? Is it a good idea ? Any led reference for it ?
Thanks
Hernán Sánchez
Medellín, Colombia
.
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