Re: [CAD_CAM_EDM_DRO] IR proximity detector

On Tue Mar 30 22:10:52 2004 Trend wrote:

>I was thinking about adding an IR proximity detector to my cnc router ((or
>even an ultrasonic one) (to see how far the vertical axis is away from the
>material.. so both transmiter and receiver is next to each other)
>Something like:
>http://www.acroname.com/robotics/parts/R132-IS471F.html
>Just seems like a fun project.
>
>Anyone know what would be the easiest solution? I need something that would
>be easy to wire up.. as I am still getting use to electronics :)
>
>thanks!-Lee

You might try the optical fiber, "Y", connector route. Drill the tinyest,
shallow hole you can make in the top of an LED. Insert a piece of viber optic
cable into the hole, with a drop of clear glue on it, and hold it till it takes
a set. Thats the transmitter side. Do the same with a photo transister; Thats
your receiver side. Now whatever length of optical cable you connect to the
bottom of the, "Y", can be routed anywhere you like, and used as both transmit
and receive, simultaneously. Driving the LED with an astable, or PWM
oscillator will give some control over sensitivity. This was originally used as
the sensor circuit in an audio object detector, with the detector end of the
fiber optic cable mounted on the tip of a blind man's cane.

Bill

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